Skkn hóa học thpt (1)

1 XÂY DỰNG HỆ THỐNG ĐỀ ÔN TẬP GIÚP HỌC SINH CHINH PHỤC CÁC ĐỀ THI MƠN HĨA HỌC BẰNG TIẾNG ANH Giáo viên, TTCM: Phạm Thị Dung Tổ Hóa Học, trường THPT Nguyễn Khuyến I Điều kiện, hoàn cảnh tạo sáng kiến - Trong xu hội nhập quốc tế ngày sâu rộng, việc học sử dụng tiếng Anh giao tiếp việc tra cứu tài liệu nước ngồi u cầu vơ quan trọng lực lượng lao động trẻ Vì vậy, vai trị nhà trường phổ thơng trang bị cho học sinh kiến thức kĩ để em tự tin sử dung tiếng Anh giao tiếp tra cứu thông tin, kiến thức internet tài liệu nước ngoài, để em thích ứng với mơi trường hoàn cảnh khác - Tỉnh Nam Định tỉnh nước tổ chức hội thi ―Giải tốn mơn khoa học tiếng Anh‖ Mục đích hội thi thúc đẩy phong trào học tiếng Anh nhà trường kích thích khả sử dụng cơng cụ tiếng Anh để tìm hiểu mơn học khác, giúp giáo viên học sinh tiếp cận kiến thức khoa học lý thú từ so sánh nội dung đề cập sách tiếng Việt với kiến thức cập nhật tài liệu nước ngồi, kích thích khả tự học, tự khám phá tình yêu khoa học em học sinh - Từ năm học 2015-2016, Sở GD-ĐT Nam Định bắt đầu tổ chức hội thi ―Giải tốn mơn khoa học tiếng Anh‖ Cho đến nay, hội thi diễn đặn ( trừ năm học 2019-2020 2021-2022: không tổ chức diễn biến phức tạp dịch bệnh), tạo nên phong trào dạy học sử dụng tiếng Anh môn khoa học trường phổ thông Tỉnh ( đặc biệt trường chất lượng cao) II Mô tả giải pháp Mô tả giải pháp trước tạo sáng kiến - Một thực tế dễ nhận thấy việc học sinh chủ động sử dụng tiếng Anh để tìm kiếm thơng tin phục vụ cho mục đích học tập mơn khoa học hạn chế Nguyên nhân việc là: +) Trước hết, mục tiêu học tập đại đa số học sinh để phục vụ kì kiểm tra, kì thi Các đề kiểm tra hay đề thi theo mô tuyp câu hỏi đóng, nặng tính tốn, câu hỏi mở thấy Vì để điểm cao em thường chọn giải pháp luyện giải tốn khó thầy giáo hay sách tham khảo, em thường khơng có ―nhu cầu‖ tìm hiểu thêm kiến thức liên quan đến giảng, đặc biệt thông tin tiếng Anh +) Rất nhiều em học sinh lực tiếng Anh hạn chế Các em ngại sử dụng tiếng Anh giao tiếp kể việc tra cứu thông tin - Từ thực tế trên, thấy rõ vai trị vơ quan trọng nhà trường đặc biệt đội ngũ thầy cô giáo trực tiếp giảng dạy việc kích thích khả tư nhu cầu tìm hiểu kiến thức liên quan đến học em học sinh - Tại trường THPT Nguyễn Khuyến, năm gần đây, kiểm tra định kì, nhà trường u cầu mơn khoa học có tối thiểu hai câu hỏi trắc nghiệm tiếng Anh mức độ nhận biết thông hiểu Vì vậy, q trình giảng dạy, thầy cung cấp cho em học sinh từ vựng chuyên môn liên quan đến chương, bài; giới thiệu cho em trang wed phù hợp để em tra cứu thông tin, đồng thời hướng dẫn em cách đọc tài liệu tiếng Anh ( đặc biệt với đối tượng học sinh khá, giỏi) - Với thân tôi, qua kinh nghiệm bồi dưỡng học sinh tham gia hội thi‖ Giải toán mơn khoa học tiếng Anh mơn Hóa học‖ số năm thấy việc lồng ghép tiếng Anh vào môn khoa học nhà trường muốn đạt hiệu cần phải thực bước, khơng nóng vội Giai đoạn một: Làm quen với tiếng Anh Hóa học: Cung cấp cho học sinh ngơn ngữ hóa học bản: Tên nguyên tố tiếng Anh, cách đọc tên hợp chất (axit, bazo, muối, oxit) tiếng Anh, thuật ngữ phòng thí nghiệm hóa học, cách thu khí, tách chất, loại phản ứng hay gặp Giai đoạn hai: Hướng dẫn học sinh cách trình bày tốn hóa học tiếng Anh: Lựa chọn tập điển hình, đơn giản , cung cấp câu dẫn hay gặp lý luận để học sinh hình dung cách trình bày hồn chỉnh theo mạch tư logic em Từ em khơng thấy khó khăn hay ngại đưa tiếng Anh vào việc học Hóa học Trong năm gần đây, số trường đại học ( kể trường đại học tốp đầu) mở rộng hình thức xét tuyển đại học, có hình thức xét tuyển thông qua kết học bạ giải học sinh giỏi cấp Tỉnh Ví dụ năm học 2019-2020, em Trần Thị Ngọc Anh – 12A3 đỗ đại học Kinh Tế Quốc Dân nhờ giải hội thi Giải tốn mơn khoa học tiếng Anh mơn Hóa học mà em tham gia năm lớp 11 3 Năm 2018-2019 viết sáng kiến ―Xây dựng hệ thống tập hướng dẫn học sinh học môn khoa học tự nhiên tiếng Anh mơn Hóa học‖ cơng nhận SKKN cấp nhành Sở KH-CN đánh giá công nhận sáng kiến có tính ứng dụng cao, phổ biến rộng rãi, đồng nghiệp Tỉnh sử dụng đánh giá cao Tiếp theo sáng kiến đó, qua năm bồi dưỡng nhận thấy để học sinh đạt kết cao kì thi thân em phải chủ động, tích cực, sau có phần móng, tảng mà thầy cung cấp thi em phải tích cực đọc thêm sách nước làm nhiều đề theo mẫu chung Sở Vì vậy, để em học sinh thuận lợi việc ôn luyện, cố gắng sưu tầm biên soạn hệ thống đề ôn tập mơn Hóa học tiếng Anh Hệ thống đề em sử dụng sau tự học phần hệ thống lý thuyết tập sáng kiến Trong tài liệu này, biên soạn 20 đề theo cấu trúc đề thi học sinh giỏi Hóa học tiếng Anh tỉnh Nam Định dùng làm tài liệu tự học cho học sinh bồi dưỡng trường THPT Nguyễn Khuyến hai năm học 2020-2021 2021-2022 Mô tả giải pháp sau tạo sáng kiến Trước hết, biết dạy học môn khoa học tiếng Anh, có mơn hóa vấn đề không đơn giản giáo viên học sinh Hiệu việc phụ thuộc vào trình độ chun mơn, lực tiếng Anh, nhiệt tình thầy tính tự giác, tình u với mơn học lực nhận thức học sinh Do đó, đối tượng tiếp cận sáng kiến chủ yếu học sinh thầy cô dạy mơn Hóa học trường THPT chất lượng cao thầy cô em học sinh tham gia vào kì thi giải tốn mơn khoa học tiếng Anh cuả nhà trường khác Đây hệ thống đề ơn tập, để làm tốt nội dung này, em phải nghiên cứu xong nội dung tiếng Anh mơn Hóa học chương trình lớp 10 học kì I chương trình lớp 11 Tất nội dung tơi trình bày chi tiết sáng kiến ―Xây dựng hệ thống tập hướng dẫn học sinh học môn khoa học tự nhiên tiếng Anh mơn Hóa học‖ Mỗi đề có phần đề ( 35 câu trắc nghiệm – điểm tập tự luận – điểm) phần đáp án ( bảng đáp án phần trắc nghiệm lời giải chi tiết phần tự luận) Nội dung câu hỏi trắc nghiệm liên quan đến nội dung sở Hóa học, kiến thức tính chất vật lý, tính chất hóa học, ứng dụng, điều chế chất Đặc biệt đề có tập phân tích hình ảnh, xử lý số liệu, nội dung liên quan đến kiến thức thực tế nhằm phát huy lực giải vấn đề học sinh, hạn chế tối đa tập nặng tính tốn Cấu trúc đề ôn tập bám sát theo cấu trúc đề thi tỉnh, giúp em ôn tập hiệu tự tin tiếp xúc với đề thi thật làm thật tốt để đạt kết cao 5 Phần hai: Hệ thống đề ôn tập ĐỀ ÔN TẬP SỐ I PART I (7.0 points) Question 1.Felipe is observing how acetic acid (vinegar) and sodium bicarbonate (baking soda) react with one another in a volcano model What evidence can Felipe look for to indicate a chemical reaction has taken place? A The volume of the acetic acid increases B The density of the baking soda decreases C Gas bubbles are produced D The baking soda is dissolved Question During a science lab, Jessica records the following data when Liquid A (clear) and Liquid B (clear) are combined in a beaker Did a chemical change occur? Why? A Yes, a new yellow liquid is formed B Yes, mixing any two unknown liquids will cause a chemical change C No, there was no change in temperature D No, there was no change in the state of matter Question Which of the following description is an example of a chemical change? A.Wood burning in a fireplace B ice melting in water in a beaker C a cracked rock D boiling water on a hotplate Question Marlene‘s family goes on an autumn campout to a local state park During her campout she notices several things that could be chemical changes Which of the following is not considered a chemical change? A leaves on the trees turning from green to red B the campfire turning wood into ashes C.the clouds forming rain from water vapor D a marshmallow turning black on the outside when cooked over the campfire Question 5.Compound Z is made from element X and element Y Compound Z is a good conductor of electricity when molten but not when solid Which statement is correct? A Compound Z has strong forces of attraction between electrons and positive ions B Compound Z has strong forces of attraction between negative ions and positive ions C Elements X and Y are both metals D Elements X and Y are both non-metals Question Which diagram shows the outer electron arrangement in calcium fluoride? A B C D 6 Question Which substance, when molten, conducts electricity? A bitumen B caesium iodide C diamond D sand Question Which statement about solid calcium chloride is correct? A It conducts electricity B It has a low melting point C It has an ionic lattice structure D it has a molecular lattice structure Question Which statement is correct for all ionic compounds? A They dissolve in water B They are formed when metals share electrons with non-metals C They conduct electricity in the molten state D They conduct electricity in the solid state Question 10 The table shows some properties of four substances Which substance is an ionic compound? A B C D Melting point/0C -102 801 842 3000 Conducts electricity when solid + + Dissolves in water + + + - Conducts electricity in aqueous solution + + + - Question 11 Which diagram correctly shows the arrangement of the ions in solid sodium chloride? A B C D Question 12.The graph gives the melting points (m.p.) of mixtures of lead and tin The graph shows that any mixture of lead and tin must have a melting point that is A above that of tin B below that of lead C below that of both tin and lead D between that of tin and lead 7 Question 13.Which equation shows a reaction that will occur at room temperature and pressure? A Br2(aq) + 2NaCl (aq) → 2NaBr(aq) + Cl2(aq) B Br2(aq) + 2NaI(aq) → 2NaBr(aq) + I2(aq) C I2(aq) + 2NaCl (aq) → 2NaI(aq) + Cl2(aq) D I2(aq) + 2NaBr(aq) → 2NaI(aq) + Br2(aq) Question 14 Aqueous copper(II) sulfate solution is placed in an iron container and left to stand for several days Which statement describes what happens? A Atmospheric oxygen reacts with the copper(II) sulfate to give black copper(II) oxide B Some fine iron particles are formed in the solution C The part of the container in contact with the solution is coated with copper D The solution turns from green to blue Question 15 Which reaction is not a redox reaction? A CaCO3 → CaO + CO2 B 2C + O2 → 2CO C C + CO2 → 2CO D Fe2O3 + 3CO → 2Fe + 3CO2 Question 16 A student has five reagents • dilute hydrochloric acid • dilute sulfuric acid • dilute nitric acid • solid calcium carbonate • solid copper(II) carbonate How many soluble salts can be prepared? A B C D Question 17 Which row shows the pH values for 0.1mol/ dm solutions of ammonia, hydrochloric acid, sodium chloride and sodium hydroxide? pH values NH3 HCl NaCl NaOH 13 11 A 11 13 B 11 13 C 13 11 D Question 18 Limestone (CaCO3) can be eroded by acids What volume (in mL) of 11.5 mol L-1 nitric acid (HNO3) is required for complete reaction with 24.7 g of limestone? A 10.7 B 11.5 C 21.5 D 42.9 Question 19 The reaction of ilmenite (FeTiO3) with chlorine and carbon can be used in the industrial production of titanium from ilmenite: 2FeTiO3 + 7Cl2 + 6C → 2TiCl4 + 2FeCl3 + 6CO When 500 kg of FeTiO3, 850 kg of Cl2 and 125 kg of C are mixed, which of these reactants is present in excess? Select all that apply A FeTiO3 B Cl2 C C D CO Question 20 The following graph shows how the solubility of an unidentified substance changes with the temperature of the solution Using the graph, what mass of precipitate will be produced when 50 mL of a saturated solution at 40 °C is cooled to 10 °C? A 15 B 20 C 25 D 30 -1 Question 21 What volume ( in L) of 2.05 mol L sodium chloride solution should be added to 1.06 L of 1.04 mol L-1 sodium chloride solution to make 2.22 L of 1.26 mol L-1 sodium chloride solution upon dilution to volume with water? A 0.49 B 0.83 C 0.96 D 1.08 Question 22 What is the formula for the compound formed by barium and nitrogen? A BaN B Ba2N C BaN2 D Ba2N3 Question 23 Which of the following species contains 21 neutrons and 19 electrons? 20 20 19  A 41 B 41 C 41 D 4121Sc 2 Ca 2 Ca  K Question 24.Jarosite is a white mineral of formula KAl3X2(OH)6, where X is an unspecified species Which of the following could X be? A HCO3– B Ca2+ C Ag+ D SO42– Question 25 How many atoms are present in a 1.0 g sample of the dimethylaminoxyl radical, (CH3)2NO? A 1.0  1022 B 6.0  1022 C 1.0  1023 D 6.0  1023 Question 26 Silver oxide (Ag2O) decomposes to silver and oxygen upon heating The molar mass of silver oxide is approximately 232 g mol–1 What amount of oxygen gas is produced when 4.64 g of silver oxide decomposes? A 0.005 mol B 0.01 mol C 0.02 mol D 0.04 mol Question 27 Iron can be produced by reducing iron(III) oxide with carbon monoxide, as described by the following balanced chemical equation: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) What mass of carbon dioxide is produced by the complete reduction of 16.0 g of iron(III) oxide? A 1.5 g B 4.4 g C 6.6 g D 13.2 g Question 28 A mixture of calcium carbonate and sodium chloride contains 10% carbon by mass What is the percentage by mass of sodium chloride in the sample? A 10% B 17% C 50% D 83% Question 29 When the following unbalanced equation is balanced, how many O2(g) molecules are consumed for every CO2(g) produced? C3H7OH(l) + O2(g) → CO2(g) + H2O(l) A 0.67 B 0.75 C 1.00 D 1.33 Question 30 When aluminium reacts with hydrochloric acid, aluminium chloride and hydrogen gas are produced The volume of one mole of hydrogen gas at 25 °C and 100 kPa is 24.79 L When 2.70 g of aluminium reacts with 50.0 mL of 5.00 mol L-1 hydrochloric acid, what volume of hydrogen gas is produced, when measured at 25 °C and 100 kPa? A 2.48 L B 3.10 L C 3.72 L D 4.96 L Question 31 Tetraethyl lead, Pb(C2H5)4, has been used as a petrol additive What is the percentage by mass of carbon in tetraethyl lead? A 10.2 B 14.9 C 29.7 D 32.0 Question 32 A white powder is known to be a mixture of magnesium oxide and aluminium oxide 100cm3 of mol.dm–3 NaOH(aq) is just sufficient to cause the aluminium oxide in x grams of the mixture to dissolve The reaction occurring is Al2O3 + 2OH– + 3H2O → 2Al(OH)4– 800cm3 of moldm–3 HCl (aq) is just sufficient to cause all of the oxide in x grams of the mixture to dissolve The reactions occurring are Al2O3 + 6H+ → 2Al 3+ + 3H2O and MgO + 2H+ → Mg2+ + H2O How many moles of each oxide are present in x grams of the mixture? Aluminium oxide A B C D 0.05 0.05 0.10 0.10 Magnesium oxide 0.25 0.50 0.25 0.50 Question 33 X and Y are both Group metals X and Y both form hydroxide compounds, but X(OH)2 is more soluble in water than Y(OH)2 If a piece of metal Y is put into cold water a very slow reaction occurs, and only a very few, small hydrogen bubbles can be seen What could be the identities of X and Y? X Y Barium Magnesium A Barium Strontium B Calcium Strontium C Magnesium Calcium D 10 Question 34 The solids sodium chloride and sodium iodide both react with concentrated sulfuric acid at room temperature With NaCl , the products are NaHSO4 and HCl With NaI, the products are NaHSO4, HI, I2, SO2, H2O, S and H2S What is the best explanation for this difference in products? A Chloride ions will displace iodine from solution B Hydrogen chloride is more volatile than hydrogen iodide C Iodide ions are better reducing agents than chloride ions D Sulfuric acid is able to act as a dehydrating agent with NaI Question 35 In some areas, lime - Ca(OH)2, is added to soil to improve crop growth Which statement correctly describes a reason why lime improves crop growth? A Lime acts as a catalyst which speeds up the release of nitrates into the soil B Lime is an effective pesticide and protects the plants from damage C Lime is used to reduce the acidity of the soil D Lime lowers the pH of the soil II PART II (3.0 points) Write the solutions to the following questions in the provided space on your anwer sheet Question A student wants to prepare 1.00 L of a 1.00 M solution of NaOH (molar mass : 40.00 g/mol) a) If solid NaOH is available, how would the student prepare this solution? b) If 2.00 M NaOH is available, how would the student prepare the solution? Question When 1.0 mol of solid lead nitrate is added to 2.0 mol of aqueous potassium iodide, a yellow precipitate forms After the precipitate settles to the bottom, does the solution above the precipitate conduct electricity? Explain Write the complete ionic equation to help you answer this question Question A solution of ethanol (C2H5OH) in water is prepared by dissolving 75.0 mL of ethanol (density 0.79 g/cm3) in enough water to make 250.0 mL of solution What is the molarity of the ethanol in this solution? C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 11 ĐÁP ÁN ĐỀ ÔN TẬP SỐ I PART (7.0 points) Câu Đ/án Câu C 11 A 12 A 13 C 14 B 15 C 16 B 17 C 18 C 19 10 B 20 II PART II (3.0 points) Đ/án A B B C A C C C B,C A Câu 21 22 23 24 25 26 27 28 29 30 Đ/án B D B D C B D B D B Câu 31 32 33 34 35 Đ/án C D A C C Question Mole of NaOH ( after): 1.00x1.00 = 1.00 mol  mass of NaOH in the resulting solution is: 1.00x40.00 = 40.00(g) a) If solid NaOH is available, We weigh 40 grams of NaOH, dissolve in a volumetric flask and stir, then add water to obtain liter of solution b) If 2.00 M NaOH is available Voloume of 2.00M NaOH solution is: 1.00/2.00 = 0.50 (L) We pour 500ml of 2M NaOH solution into the volumetric flask, then add water to get liter of 1M NaOH solution Question We have reaction Pb(NO3)2(aq) + 2KI(aq)  PbI2 (solid) + 2KNO3(aq) 1mol  mol  mol  we have the net ionic equation Pb2+(aq) + 2I-(aq)  PbI2 (solid) Because Pb2+ acts just enough to I-, the solution after eaction contains K+ and NO3- So the solution after the reaction conducts electricity because there are free ions Question Mass of ethanol is: 75.00x0.79 = 59.25 (g) Mole of ethanol is: 59.25/46.00 = 1.288 mol the molarity of the ethanol in 250ml solution: 1.288/0.25 = 5.15mol.L-1 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 12 ĐỀ ÔN TẬP SỐ I PART (7.0 points) Question The plot shows the volume of H2 gas produced as a function of time by the reaction of a given mass of magnesium turnings with excess M HCl What graph results from the reaction of an equal mass of magnesium turnings with excess M HCl? A B C D Question An ionic compound has the formula XY, know that Y is a non-metal Which statement about XY is correct? A An atom of X has lost at least one electron to form a positive ion B Both X and Y share a pair of electrons C Element X is also a non-metal D XY will not conduct electricity when liquid Question Which statement about chlorine atoms and chloride ions is correct? A They are both isotopes of chlorine B They undergo the same chemical reactions C They have the same number of protons D They have the same physical properties Question After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate What could X be? A calcium iodide B copper(II) chloride C lead(II) iodide D sodium chloride Question Which conditions will give the highest rate of diffusion of a gas? Molecular of gas temperature A Large high B Large low C Small high D Small low Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 13 Question Diamond and graphite are two different forms of the element carbon They each have different uses Which row is correct? Use To cur glass As an electrode As a lubricant A diamond diamond graphite B diamond graphite graphite C graphite diamond diamond D graphite graphite diamond Question What is the number of shared pairs of electrons in an ammonia molecule? A B C D Question Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide What is the correct ionic equation, including state symbols, for this reaction? A CaCO3(s) + 2HCl (aq) CaCl2(aq) + H2O(l) + CO2(g) B Ca2+(aq) + CO32–(aq) + 2H+(aq) Ca2+(aq) + H2O(l) + CO2(g) C CO32–(aq) + 2H+(aq) H2O(l) + CO2(g) D CaCO3 (s) + 2H+(aq) Ca2+(aq) + H2O(l) + CO2 (g) Question In a volumetric experiment, 25.0cm3 of 0.100 mol / dm3 sodium hydroxide reacts exactly with 20.0 cm3 of sulfuric acid 2NaOH + H2SO4 → Na2SO4 + 2H2O What is the concentration of the sulfuric acid? A 0.0625 mol /dm3 B 0.0800 mol /dm3 C 0.125 mol /dm3 D 0.250 mol /dm3 Question 10 Which negative ions are present in aqueous copper(II) sulfate? A copper(II) ions and hydrogen ions B copper(II) ions only C sulfate ions and hydroxide ions D sulfate ions only Question 11 Some students wrote three statements about the bonding in a molecule of ammonia, NH3 (1) A nitrogen atom has three outer electrons so all outer electrons are involved in bonding (2) A nitrogen atom has five outer electrons so two outer electrons are not involved in bonding (3) A nitrogen atom shares electrons with each of three hydrogen atoms Which statements about the bonding in ammonia are correct? A and B only C and D only Question 12 What is the total number of valence electrons in the S4O62˗ ion? A 58 B 60 C 62 D 82 Question 13 Gas X turns acidified potassium manganate(VII) from purple to colourless Gas Y turns aqueous potassium iodide from colourless to brown What these observations show about gas X and gas Y? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 14 A B C D Gas X Oxidising agent Oxidising agent Reducing agent Reducing agent Gas Y Oxidising agent Reducing agent Oxidising agent Reducing agent Question 14 What is the best method to prepare a pure sample of copper(II) sulfate? A Add copper to aqueous zinc sulfate B Add copper to dilute sulfuric acid C Add copper(II) carbonate to aqueous sodium sulfate D Add copper(II) oxide to dilute sulfuric acid Question 15 What is the percentage by mass of nitrogen in ammonium nitrate, NH4NO3? A 17.5 B 22.2 C 33.3 D 35.0 Question 16 The solubility of KClO3 at several temperatures is shown in the accompanying diagram A student mixes 10.0 g of KClO3 with 45.0 g of H2O and stirs it for a long time at 60 ˚C until the solution is completely clear then allows it to cool slowly to 20 ˚C where it remains clear Which statement about the final clear mixture at 20 ˚C is correct? A It is a saturated solution B It is an unsaturated solution and can be made saturated by decreasing the temperature C It is an unsaturated solution and can be made saturated by increasing the temperature D It is a supersaturated solution Question 17 Element X forms: - a covalent compound, H2X - an ionic compound, Na2X - oxides XO2 and XO3 To which group of the Periodic Table does X belong? A II B III C IV D VI Question 18 Magnesium chloride dissolves in water to form A hydrated MgCl2 molecules B hydrated Mg2+ ions and hydrated Cl– ions C hydrated Mg2+ ions and hydrated Cl22– ions D hydrated Mg atoms and hydrated Cl2 molecules Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 15 Question 19 Some atmospheric pollutants are listed (1) sulfur dioxide (2) methane (3) nitrogen dioxide (4) unburned hydrocarbons Which substances could be removed by reacting with calcium hydroxide? A and B and C and D and Question 20 River water contains many impurities Which process alone can produce pure water from river water? A adding chlorine B Distillation C Filtering D passing through carbon Question 21 Three experiments are carried out in which the same mass of magnesium is reacted with the same volume of dilute sulfuric acid at room temperature The magnesium is in excess experiment 1: Large pieces of magnesium are used experiment 2: Small pieces of magnesium are used experiment 3: Large pieces of magnesium are used but the concentration of the acid is increased Graphs of the results are shown Which row is correct? A B C D experiment W X Y Y experiment X Y W X experiment Y W X W Question 22 The results of two tests on solution X are shown Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 16 Which ion is present in solution X? A Al3+ B Ca2+ C Cu2+ D Zn2+ Question 23 Which diagram shows the arrangement of particles inside a balloon containing a mixture of the gases nitrogen and oxygen? A B C D Question 24 A student follows the rate of the reaction between marble chips, CaCO3, and dilute hydrochloric acid CaCO3 + 2HCl →CaCl2 + CO2 + H2O Which diagrams show apparatus that is suitable for this experiment? A and only B and only C and only D 1,2 and Question 25 Which change always occurs when a metal atom is oxidised? A It becomes positively charged B It combines with oxygen C It gains an electron D It gains a proton Question 26 The total number of electrons in one atom of element Q is 17 and in one atom of element R is 19 Which statement about elements Q and R is correct? A Q and R react together to form a covalent compound B Q forms positive ions C R has more outer shell electrons than Q D R is more metallic than Q Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 17 Question 27 Octane, C8H18, is a hydrocarbon that undergoes combustion in a petrol engine .W C8H18 + X O2  Y CO2 + Z H2O Which row shows the figures needed to balance the equation? A B C D W 1 2 X 17 16 25 Y 8 16 Z 9 18 Question 28 Find the mole fraction of the ZnSO4 in a solution whose density is 1.25 g/mL and whose molarity is 1.19 M ZnSO4 A 0.575 B 0.174 C 0.02 D 1.02 Question 29 Of the following compounds, which are not likely to increase in solubility as the temperature of the solution increases? CH4 NaBr CO2 Glucose, C6H12O6 CuSO4 A only B and C and D only Question 30 The table shows some properties of four metal chlorides Which row is magnesium chloride? Colour Solubility in water Method of preparation A green insoluble precipitation B green soluble Metal and acid C white insoluble precipitation D white soluble Metal and acid Question 31 A lump of element X can be cut by a knife During its reaction with water, X floats and melts What is X? A calcium B copper C magnesium D potassium Question 32 In two experiments, and 2, an excess of powdered calcium carbonate was reacted in a flask with dilute hydrochloric acid In experiment 1, the carbon dioxide evolved was collected and the volume of gas measured at regular intervals In experiment 2, the mass of the flask and its contents was measured at regular intervals Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 18 The results of both experiments were plotted on graphs Which graphs correctly show the results of these two experiments? Experiment W W X X A B C D Experiment Y Z Y Z Question 33 Iron(II) ions react with chlorine Which statement about this reaction is correct? A Chlorine is reduced by iron(II) ions B Chlorine is the reducing agent C Iron(II) ions are reduced by chlorine D Iron(II) ions are the oxidising agent Question 34 Element Z combines with sodium to form the compound Na2Z The positions of four elements are shown on the outline of part of the Periodic Table Which is element Z? A A B B C C D D Question 35 The table shows the observations made when an aqueous solution of salt Z has different reagents added to it What is Z? A copper(II) chloride C iron(II) chloride B copper(II) sulfate D iron(II) sulfate Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 19 II PART II (3.0 points) Write the solutions to the following questions in the provided space on your anwer sheet Question a) Balance the following equation: P4O10(s) + H2O(l) → H3PO4(aq) b) When 4.585 g of P4O10 reacts with water to produce 100 mL of H3PO4 solution, what concentration of H3PO4 (in mol L-1) is this solution? c) An aliquot of this H3PO4 solution is titrated with NaOH with using thymolphthalein as an indicator 23.03 mL of 1.122 mol L-1 NaOH are required What chemical amount of NaOH is required? Express your answer in mol or mmol d) If the aliquot of H3PO4 solution had a volume of 20.00 mL, how many moles of NaOH are required per mole of H3PO4? Question Some copper (ll) sulphate pentahydrate (CuSO4 5H2O), was heated at 120 o C with the following results Wt of crucible = 10.00 g; Wt of crucible + CuSO4 5H2O =14.98g; Wt of crucible + residue = 13.54 g How many molecules of water of crystalization were lost? Question 3.The concentration of a saturated solution of calcium chloride in water at 0°C is 60.93 g/100 mL, the density of this solution is 1.366 g mL-1 and the density of water at 0°C is 1.000 g mL-1.What mass of calcium chloride hexahydrate (CaCl2·6H2O) needs to be added to 100 mL of water to make a saturated solution? (Hint: consider the water present in the added solid.) Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 20 ĐÁP ÁN ĐỀ ÔN TẬP SỐ I PART (7.0 points) Câu Đ/án Câu D 11 A 12 C 13 D 14 C 15 B 16 A 17 D 18 A 19 10 D 20 Đ/áCn C C C D D D D B B D Câu 21 22 23 24 25 26 27 28 29 30 Đ/án D D C D A D D C B D Câu 31 32 33 34 35 Đ/án D A C B B PART II (3.0 points) Question a) P4O10(s) + 6H2O(l) → 4H3PO4(aq) b) mole of P4O10 is 4.585/284= 0.016 mol P4O10(s) + 6H2O(l) → 4H3PO4(aq) 0.016 → 0.064 mol →The concentration of H3PO4 (in mol L-1) is this solution: 0.064/0.1= 0.64 mol.L-1 c) mole of NaOH is 0.02303 x 1.122 = 0.02584 mol → mass of NaOH is required: 0.02584 x 40 = 1.0336 (g) d) mole H3PO4 is: 0.64 x 0.02 = 0.0128 mol We have nNaOH 0.02584   2.018  nH3 PO4 0.0128 → moles of NaOH are required per mole of H3PO4 H3PO4 + 2NaOH → Na2HPO4 + H2O Question Mass of CuSO4 5H2O is: 14.98 -10.00= 4.98 g Mole of CuSO4 5H2O is: 4.98/250 = 0.01992 mol → mol of CuSO4 is 0.01992 mol Mass of H2O were lost: 14.98 – 13.54 = 1.44 g → mol of H2O were lost: 1.44/18 = 0.08 mol The molecules of water of crystalization were lost: 0.08/0.01992 = Question Let the mole of CaCl2.6H2O be a → mass of CaCl2 is: 111a (g) → mass of H2O in CaCl2.6H2O is: 18x6a = 108a (g) → mass of solution is 219a + 100 (g) Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 21 We have, mass of 100ml solution is 1.366x100 = 136.6 (g) In 136.6 (g) of solution has 60.93 (g) of CaCl2 In 219+100 (g) of solution has 111a (g) CaCl2 → 136.6 60.93  219a  100 111a → a = 3.35 mol → mass of calcium chloride hexahydrate (CaCl2·6H2O) needs to be added to 100 mL of water to make a saturated solution is 3.35x219 = 733,6 (g) Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 22 ĐỀ ÔN TẬP SỐ I PART (7.0 points) Question Which of the following molecules contains 36.86% nitrogen by mass? A NO B N2O C N2O3 D N2O4 Question Which of the following compounds exists as linear molecules at room temperature and pressure? A CO2 B SO2 C NaCl D OF2 Question Which of the following species contains 21 neutrons and 19 electrons? A B C D Question Which of the following substances has the highest boiling point? A water B nitric acid C hydrogen chloride D sodium chloride Question When E10 fuel is combusted, it involves the combustion of organic compounds ethanol and octane, as shown in the following chemical equations: C2H5OH + O2 → CO2 + H2O 2C8H18 + 25 O2 → 16 CO2 + 18 H2O When 1.00 g of ethanol and 1.00 g of octane are combusted in excess oxygen, what is the total volume of CO2 produced from the combustion, measured at 25 °C and 100 kPa? (Molar volume of ideal gas at 25 °C and 100 kPa = 24.79 L) A 1.08 L B 2.58 L C 2.81 L D 3.68 L 3− Question When the complex ion Cr(OH)6 is heated with hydrogen peroxide solution under alkaline conditions, it is oxidised to CrO4 2− through a redox reaction The relevant half equations are: H2O2 + e → OH− Cr(OH)6 3− + OH− → CrO42− + 4H2O + e If 100 mL of 2M Cr(OH)6 3− solution is heated with excess hydrogen peroxide solution under alkaline conditions, what is the net chemical amount (in mol) of hydroxide ions produced? A 0.1 mol B 0.2 mol C 0.6 mol D 1.0 mol Question Five beakers (labelled to 5) each contain 0.5 moles of silver nitrate, dissolved in water Into each of these beakers is added a certain amount of a metal chloride, also dissolved in water, as shown in the table below Silver chloride precipitates from solution in all five beakers Which two beakers contain the maximum mass of silver chloride precipitate? A and B and C and D and Question When solid zinc is added to a solution containing silver nitrate, solid silver precipitates from solution, according to the following chemical equation: 2AgNO3(aq) + Zn(s) → Zn(NO3)2(aq) + 2Ag(s) Which of the following shows the relative changes in concentration of each species over time? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 23 A B C D decreases decreases no change increases no change decreases no change increases Question Elements W and X react to form an ionic compound W and X have and valence electrons respectively What is the formula of this compound formed from the reaction between W and X? A W2X6 B WX3 C WX D W3X Question 10 A mass fraction of part per million (ppm) is equivalent to a g of solute per million grams of solution (i.e solute + solvent), or mg of solute per kg of solution A solution is made by dissolving 358.4 mg of iodine in 0.2500 L of ethanol (the density of ethanol is 0.7893 kg L −1) What is the mass fraction of iodine in this solution, expressed in ppm? A 1130 ppm B 1132 ppm C 1434 ppm D 1816 ppm Question 11 Which of the following is the next most abundant carbon dioxide isotopologue having a relative molecular mass of 47? A 11C18O18O B 12C16O17O C 12C17O18O D 13C17O17O Question 12 A chemist is trying to determine the mass percentage of sulfate ions in a fertiliser They know that the fertiliser contains only three anions: nitrate, carbonate and sulfate The chemist decides to dissolve 4.000 g of fertiliser in water and add barium nitrate solution (this precipitates BaCO3 and BaSO4) They record that exactly 40.00 mL of 1.000 M barium nitrate solution was required for precipitation to be complete The chemist prepares a second aqueous solution containing 4.000 g of the fertiliser and adds hydrochloric acid to it (this reacts with the CO3 2− ions to produce CO2) They record the mass of CO2 produced as 1.600 g What is the mass percentage of sulfate ions in the fertiliser? A 8.75% B 23.43% C 45.78% D 59.89% Question 13 Which of the following will produce a gas when reacted with hydrochloric acid? A NaHCO3 B NaOH C NaNO3 D Na2SO4 Question 14 Nitric oxide (NO) reacts completely with oxygen to form nitrogen dioxide according to the following balanced chemical equation: NO(g) + O2(g) → NO2(g) If L of NO and L of O2 are reacted in a balloon, what will be the final volume of the balloon after the reaction is complete, assuming that the temperature and pressure are unchanged? A 1.0 L B 2.0 L C 2.5 L D 3.0 L Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 24 Question 15 Calcium hydroxide (Ca(OH)2) is sparingly soluble in water, with a solubility of 1.73 g/L at 20 °C If 0.400 g of calcium hydroxide is placed in 200 mL of water at 20°C, what mass of calcium hydroxide will remain undissolved? A 0.027 g B 0.054 g C 0.173 g D 0.346 g Question 16 Phosphoric acid is a triprotic acid What mass of Ca(OH)2 would be required to neutralise 100 mL of a mol L−1 solution of phosphoric acid (H3PO4)? A 3.7 g B 4.9 g C 7.4 g D 11.1 g Question 17 Acid number is a commonly used metric in the paint industry It is defined as the mass (mg) of potassium hydroxide required to completely neutralise the acid in g of paint A paint has an acid number of 185 What volume of 0.100 M KOH is required to completely neutralise 0.5 g of that paint? A 1.65 mL B 3.30 mL C 16.5 mL D 18.5 mL Question 18 Consider four elements: calcium, oxygen, potassium and sulfur What would be the correct order if they were arranged according to increasing electronegativity? A Calcium < oxygen < potassium < sulfur B Calcium < potassium < sulfur < oxygen C Oxygen < sulfur < potassium < calcium D Potassium < calcium < sulfur < oxygen Question 19 Aqueous Fe2+ ions are readily oxidised to Fe3+ ions by oxygen gas in acidic solutions Consider the following relevant reduction half equations: Fe2+(aq) →Fe3+(aq) + e 4H+ (aq) + O2(g) + 4e → 2H2O(l) What chemical amount (in mol) of H2O would be produced from the reaction of mol of Fe2+ with excess oxygen under acidic conditions? A mol B mol C mol D mol Question 20 Which of the following elements is a solid at room temperature? A I2 B F2 C Cl2 D Br2 Question 21 2.00 g of a mixture containing NaNO3 and NaCl was dissolved in 250 mL of water This solution was then titrated against 0.050 mol L–1 AgNO3, requiring 20.00 mL to fully precipitate the chloride ions as silver chloride What was the percentage by mass of NaCl in the sample? A 1.77% B 2.92% C 5.84% D 7.17% Question 22 A solid sample of calcium carbonate was placed into a solution of hydrochloric acid Which of the following options shows the correct change in concentration of each species over time, as the reaction proceeds? CaCO3 (s) + HCl (aq)  H2O(l) + CO2 (g) + CaCl2 A B C D decreases decreases decreases no change increases increases no change increases Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn increases no change increases increases C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 25 Question 23 A chemist wishes to make a fertiliser solution containing ions that will act as a source of nitrogen, phosphorus and potassium Which one of the following mixtures of solids will completely dissolve to give such a solution? A B C D NaNO3 K2CO3 NH4NO3 NH4Cl Ca3(PO4)2 Na3PO4 Na3PO4 K3PO4 KCl AgNO3 KCl CaCl2 Question 24 A sample of water from a stream was analysed for the presence of metal ions The results of some tests on the water are recorded in the table Which metal is most likely to be present in the water? A Ba2+ B Mg2+ C Cu2+ D Fe3+ Question 25 Sodium thiosulfate (Na2S2O3) reacts with hydrochloric acid according to the following chemical equation: Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + S(s) + SO2(g) + H2O(l) Solutions of sodium thiosulfate and hydrochloric acid were mixed and the volume of sulfur dioxide gas produced (at a pressure of 100 kPa) was recorded as a function of time The experiment was first performed at 25 °C and then repeated at temperature of 0°C Which of the following graphs show the results of these two experiments? A B C D Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 26 Question 26 Nitrogen dioxide (NO2) dimerises to form N2O4, as represented by the equilibrium reaction: NO2(g) ⇌ N2O4(g) ∆H < The following graph depicts the concentration of NO2 and N2O4 gases in a closed reaction vessel At t = 10 s, the equilibrium between the two species is disrupted, and a new equilibrium is reached At t = 20 Which one of the following disruptions at t = 10 would be consistent with the graph? A Addition of only N2O4 to the reaction vessel B Addition of only NO2 to the reaction vessel C Decrease in volume of the reaction vessel D Increase in temperature inside reaction vessel Question 27 What is the concentration (in mol L–1 ) of Na+ ions in a solution prepared by diluting 250.0 mL of 0.550 mol L–1 Na2SO4 to 1250 mL? A 0.110 mol L–1 B 0.138 mol L–1 C 0.220 mol L–1 D 0.275 mol L–1 Question 28 Which compound contains the highest percentage by mass of magnesium (Mg)? A MgNH4PO4 B Mg(H2PO4)2 C Mg2P4O7 D Mg3(PO4)2 Question 29 A student dissolves solid calcium carbonate in an excess of 0.01 mol L–1 nitric acid while stirring, and is looking for ways to make this reaction faster Which of the following actions would increase the rate of reaction? A Adding distilled water to the solution while stirring B Cooling the nitric acid before adding the calcium carbonate C Decreasing the concentration of nitric acid D Heating the nitric acid before adding the calcium carbonate Question 30 Which list below gives non-metals that can be found in their elemental form in nature? A neon, phosphorus, fluorine B helium, hydrogen, oxygen C helium, carbon, fluorine D nitrogen, chlorine, sulfur Question 31 powder copper was added to a solution of silver nitrate at standard conditions Given that silver is a less reactive metal than copper, which of the following observations would be most likely? A A blue precipitate forms on the silvery solid and the solution turns colourless B The blue solid dissolves in the colourless solution and a silvery precipitate is formed Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 27 C The silvery solid dissolves and a blue precipitate forms; the blue colour of the solution fades D.The reddish brown solid is disolved, a silvery precipitate appeared, the solution changed from colorless to blue Question 32 25.00 mL of each of the following solutions is added to 20 g of solid MgCO3 After the reactions are complete, which of the solutions will produce the largest volume of CO2 at room temperature and pressure? A mol L–1 H2SO4 B mol L–1 HCl C mol L–1 HNO3 D mol L–1 H2SO4 Question 33 How is the structure and bonding in diamond best described? A covalent molecular B covalent network C metallic D molecular Question 34 Which of these pairs of compounds could be separated on the basis of their solubility in water? A AgNO3 CaBr2 B PbCO3 CaCO3 C SiO2 BaSO4 D ZnSO4 AgCl Question 35 In which one of the following pairs is the radius of the second atom greater than that of the first? A Na, Mg B Sr, Ca C N, P D Si, P II PART (3.0 points) Question 1: A student is given the task of determining the molar concentration of a CuSO4 solution using two different procedures, precipitation and spectrophotometry For the precipitation experiment, the student add20.0 mL of 0.200M Ba(NO3)2 to 50.0mL of the CuSO4( aq) The reaction goes to completion and a white precipitate forms The student filters the precipitate and dries it overnight The data are given in the following table a) Write the balanced net ionic equation for the precipitation reaction b) Caculate the number of moles of precipitate formed c) Caculate the molarity off original CuSO4 solution d) Caculate the volume of 0,1000M CuSO4 (aq) needed to make 50.00 mL 0f 0.0500M CuSO4 (aq) Question You are given a 1.50-g mixture of sodium nitrate and sodium chloride You dissolve this mixture into 100 mL of water and then add an excess of 0.500 M silver nitrate solution You produce a white solid, which you then collect, dry, and measure The white solid has a mass of 0.641 g Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 28 a If you had an extremely magnified view of the solution (to the atomic-molecular level), list the species you would see (include charges, if any) b Write the balanced net ionic equation for the reaction that produces the solid Include phases and charges c Calculate the percent sodium chloride in the original unknown mixture Question 3: To determine the molar mass of unknown metal, M, a student reacts iodine with an exess of the metal to form the water- soluble compound MI2, as represented by the equation above M + I2 → MI2 The reation proceeds until all of I2 is consumed The MI2(aq) solution is quantitatively collected and heated to remove the water, and the product is dried and weighed to constant mass The experimental steps are represented below, followed by a data table a) Given that the metal M is in excess, caculate the number of moles of I2 that reacted b) Caculate the molar mass of the unknown metal M Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 29 ĐÁP ÁN ĐỀ ÔN TẬP SỐ I PART (7.0 points) Câu Đ/án Câu C 11 A 12 C 13 D 14 C 15 C 16 B 17 A 18 C 19 10 D 20 Đ/án C A A B B D C D A A Câu 21 22 23 24 25 26 27 28 29 30 Đ/án B B C B B C A D D B Câu 31 32 33 34 35 Đ/án D D B D C II PART (3.0 points) Question 1: a) Write the balanced net ionic equation for the precipitation reaction Ba2+ (aq) + SO42- (aq)  BaSO4(s) b) precipitate formed is BaSO4 Mass of precipitate is 1.136-0.764 = 0.372 (g)  The number of moles of precipitate formed: 0.372/233 = 1.6x10-3 mol c) number of moles of Ba(NO3)2 is: 0.200x0,02 = 0.004 (mol)  number of moles of Ba2+ = 0.004 mol Because, number of moles of Ba2+ > number of moles of BaSO4  SO42- is limited  number of moles of SO42- = number of moles of BaSO4 = 1.6x10-3 mol number of moles of CuSO4 = 1.6x10-3 mol  The molarity off original CuSO4 solution is: (1.6x10-3)/0.02 = 0.08 mol.Ld) Moles of CuSO4 in formed solution is: 0.05 x 0.05 = 0.0025 (mol)  Volume of 0.1 M CuSO4 (aq) needed: 0.0025/0.1 = 0.025 L = 25 ml  We pour 25ml of 0.1M CuSO4 into graduated cylinder, then we add H2O until 50ml and stir Question Dissociation equations of substances NaNO3  Na+ + NO3NaCl  Na+ + ClAgNO3  Ag+ + NO3a) If we had an extremely magnified view of the solution (to the atomic-molecular level), we would see: Na+ , NO3-, Cl-, Ag+ b) Write the balanced net ionic equation for the reaction that produces the solid Ag+ (aq) + Cl- (aq)  AgCl(s) c) Let the number of mole of NaNO3 be x Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 30 Let the number of mole of NaCl be y Mass of initial mixture : 85x + 58.5y = 1.5 (1) Ag+ (aq) + Cl- (aq)  AgCl(s) y y Mass of precipitate 143.5y = 0.641 (2) From (1) to (2) , x = 0.0146 mol= number mol of NaNO3 y = 4.467.10-3 = number mol of NaCl  The percent sodium chloride in the original unknown mixture: (4.467.10-3 x 58.5)/1.5 = 17.42% Question 3: a) Given that the metal M is in excess, caculate the number of moles of I2 that reacted Mass of I2 that reacted = 127.570 – 126.549 = 1.021 g I2 Number of moles of I2 = 0.263  65.4 g / mol 0.004023 b) Caculate the molar mass of the unknown metal M According to the equation M + I2 → MI2 We have: Number of moles of I2 = Number of moles of M = 0.004023 mol Mass of M that reacted = 1.284 g MI2 – 1.021 g I2 = 0.263 g M Molar mass of M = 0.263  65.4 g / mol 0.004023 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 31 ĐỀ ÔN TẬP SỐ I PART (7.0 points) Question Benzene, C6H6, reacts with oxygen, O2, to form CO2 and H2O How much O2 is required for the complete combustion of 1.0 mol C6H6? A 6.0 mol B 7.5 mol C 9.0 mol D 12 mol Question A 10.00 g sample of a soluble barium salt is treated with an excess of sodium sulfate to precipitate 11.21 g BaSO4 (M = 233.4) Which barium salt is it? A BaCl2 (M = 208.2) B Ba(O2CH)2 (M = 227.3) C Ba(NO3)2 (M = 261.3) D BaBr2 (M = 297.1) Question What is the concentration of nitrate ion in a 425 mL solution containing 32.0 g of Mg(NO3)2 (M = 148.3)? A 0.216 M B 0.432 M C 0.508 M D 1.02 M Question A 25.0 mL sample of 0.15 M silver nitrate, AgNO3, is reacted with a 3.58 g sample of calcium chloride, CaCl2 (M = 111.0) Which of the following statement is true? A Silver nitrate is the limiting reactant and calcium nitrate precipitates B Silver nitrate is the limiting reactant and silver chloride precipitates C Calcium chloride is the limiting reactant and calcium nitrate precipitates D Calcium chloride is the limiting reactant and silver chloride precipitates Question Which calcium compound is not appreciably more soluble in 0.1 M hydrochloric acid than it is in pure water? A Limestone, CaCO3 B Slaked lime, Ca(OH)2 C Gypsum, CaSO4 • H2O D Hydroxyapatite, Ca5(OH)(PO4)3 Question Which metal reacts most vigorously with water at 25 °C? A Na B Mg C K D Ca Question Each of the following forms a colored aqueous solution EXCEPT A Cr(NO3)3 B Fe(NO3)3 C Cu(NO3)2 D Zn(NO3)2 Question A student wishes to measure 37 mL of a liquid Which apparatus would be most suitable? A 50 mL graduated cylinder B 50 mL florence flask C 50 mL beaker D 50 mL Erlenmeyer flask Question A 2.0 mL sample of a colorless solution, when treated with a few drops of M hydrochloric acid, forms a white precipitate which dissolves when the solution is heated to boiling The original solution could have contained which of the following cations? I 0.1 M Ag+ II 0.1 M Pb2+ A.I only B II only C Either I or II D Neither I nor II Question 10 Which of the following would lead to an increase in the vapor pressure of a liquid? I Increasing the temperature II Adding a nonvolatile solute A I only B II only C Both I and II D Neither I nor II Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 32 Question 11 A student is separating CHCl3 (bp = 61 °C) from CHCl2CHCl2 (bp = 146 °C) by distillation She has just begun to collect the first distillate in the receiving flask At what position in the apparatus will the temperature be 61°C? A A B B C C D.D Question 12 A 3.0 L sample of helium gas is stored in a rigid, sealed container at 25 °C and 1.0 atm pressure The temperature is increased to 125 °C What is the new pressure of the gas? A 0.20 atm B 0.75 atm C 1.3 atm D 5.0 atm Question 13 Diamond is an example of what kind of solid? A Ionic B Metallic C Molecular D Network covalent Question 14 The cubic unit cell of a perovskite structure containing atoms of types A, B, and C is illustrated below What is the empirical formula of this substance? A ABC B ABC3 C AB4C6 /D AB8C12 Question 15 For the reaction 5O2(g) + NH3(g)  NO(g) + H2O(g) if NH3 is being consumed at a rate of 0.50 M•s –1 , at what rate is H2O being formed? A 0.33 M•s –1 B 0.50 M•s –1 C 0.75 M•s –1 D 3.0 M•s –1 Question 16 Which element has chemical properties most similar to those of Cl? A N B O C C D Br Question 17 Compared to ionic compounds of similar molar mass, hydrocarbons typically have I Higher water solubility II Higher melting points A I only B II only C Both I and II D Neither I nor II Question 18 What is the relationship between the two compounds below? CH3CH2CH(CH3)CH2CH3 CH3CH2CH2CH(CH3)CH3 A Identical B Stereoisomers C Geometric isomers D Structural isomers Question 19 Which compound contains the highest percentage of magnesium by mass? A MgNH4PO4 B Mg(H2PO4)2 C Mg2P4O7 D Mg3(PO4)2 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 33 Question 20 In the diagram above the paired open spheres represent H2 molecules and the paired solid spheres represent N2 molecules When the molecules in the box react to form the maximum possible amount of ammonia (NH3) molecules, what is the limiting reactant and how many molecules of NH3 can be formed? A N2 is limiting molecules of NH3 can be formed B N2 is limiting 10 molecules of NH3 can be formed C H2 is limiting molecules of NH3 can be formed D H2 is limiting.12 molecules of NH3 can be formed Question 21 Vanillin, C8H8O3 (M = 152 g/mol), is the molecule responsible for the vanilla flavor in food How many oxygen atoms are present in a 45.0 mg sample of vanillin? A 1.78 × 1020 B 5.35 × 1020 C 1.78 × 1023 D 5.35 × 1023 Question 22 What is the molarity of sodium ions in a solution prepared by diluting 250 mL of 0.550 M Na2SO4 to 1.25 L? A 0.110 M B 0.138 M C 0.220 M D 0.275 M Question 23 The solubility of K2Cr2O7 in water is 125 g/L at 20 °C A solution is prepared at 20 °C that contains 6.0 grams of K2Cr2O7 in 50 mL of water This solution is A dilute B saturated C supersaturated D unsaturated Question 24 Which of the following is a weak electrolyte in aqueous solution? A HF B NaF C HCl D KCl Question 25 Which list gives nonmetals that are found in their elemental forms in nature? A neon, phosphorus, fluorine B helium, hydrogen, iodine C nitrogen, oxygen, sulfur D oxygen, chlorine, phosphorus Question 26 Which one of the following cannot act as an oxidizing agent? A S 2– B SO3 2– C SO4 2– D S2O8 2– Question 27 Which substance is the primary component in stalactites and stalagmites in caves? A CaO B CaCO3 C Ca(OH)2 D CaSO4 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 34 Question 28 Which method(s) can be used to determine the concentration of HNO3 in an aqueous solution of nitric acid? I titration with a standard base II titration with a standard oxidizing agent III precipitation with Ag+ A I only B III only C I and II only D I, II, and III Question 29 What type of solid is silicon carbide, SiC? A ionic B metallic C molecular D network covalent Question 30 A device used to test alcohol in the bloodstream uses the reaction 2K2Cr2O7(aq) + 8H2SO4(aq) + 3CH3CH2OH(aq)  2Cr2(SO4)3(aq) + 2K2SO4(aq) + 3CH3COOH(aq) + 11H2O If the rate of disappearance of K2Cr2O7 is 1.24 M/min what is the rate of disappearance of CH3CH2OH? A 0.415 M/min B 0.826 M/min C 1.86 M/min D 3.72 M/min Question 31 C(s) + O2(g) CO(g) ∆H < If the reaction is at equilibrium with excess C(s) remaining, what change will increase the quantity of CO(g) for the reaction at equilibrium? I Adding C(s) II Increasing the temperature III Increasing the pressure A I only B III only C I, II, and III D None of these Question 32 What is the oxidation number of As in the compound K(NH4)2AsO4•6H2O? A –3 B +1 C +3 D +5 Question 33 When the equation MnO4– + SO32– + H+  Mn2+ + SO42– + H2O is balanced correctly with the smallest whole number coefficients, what is the coefficient for H2O? A B C D 10 Question 34 Which of the following isoelectronic species has the largest radius? A K + B Ca2+ C P 3– D S 2– Question 35 Which of the following statements regarding structural isomers is correct? They have A.the same molecular formula but the atoms are bonded in different ways B the same molar mass but different atoms in their composition C the same physical properties but different chemical properties D different isotopes in their structures Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 35 II PART (3.0 points) Question Phosphoric acid can be manufactured according to the following reaction: Ca3(PO4)2 + SiO2 + C + O2 + H2O CaSiO3 + CO2 + H3PO4 If equal masses of calcium phosphate (M = 310.) and silica (M = 60.0) are reacted with excess carbon, oxygen, and water to produce 1.00 x103 kg phosphoric acid (M = 98.0), what mass of calcium phosphate was used, assuming 100% yield? Question A certain gas A is a component of atmospheric air and plays an important role in the photosynthesis of plants A strip of magnesium burns in A to produce a grey mixture of a white substance B and a black substance C Know that B is insoluble in the bases; C are virtually insoluble in dilute acids and bases Combustion of C in oxygen yields A When magnesium is burned in gas D, which is another component of atmospheric air, a white substance E is formed The latter dissolves rapidly in acids and decomposes in water to produce gas F with a characteristic pungent odor a) Identify compounds A through F b) Write the chemical equations to represent the transformations of these compounds c) The interaction of A with F is a commercial method of production of a certain valuable fertilizer Name this fertilizer and write the chemical equation for its production Question A 1.92 L sample (at STP) of a gaseous mixture of hydrocarbons that is 12.6% elemental hydrogen (by mass) was burned in an excess of oxygen The volatile combustion products were dried and bubbled through 400 mL of a 4.82% (by mass) NaOH solution with a density of 1.05 g/cm3 a) Calculate the initial mass of the hydrocarbon mixture given that its specific gravity relative to nitrogen is 2.27 b) What volume is occupied by the resulting carbon dioxide at STP? c) Determine the qualitative and quantitative composition of the solution obtained by bubbling the carbon dioxide gas through the NaOH solution Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 36 ĐÁP ÁN ĐỀ ÔN TẬP SỐ I PART (7.0 points) Câu Đ/án Câu B 11 A 12 D 13 B 14 C 15 C 16 D 17 A 18 B 19 10 A 20 Đ/án B C D B C D D D D C Câu 21 22 23 24 25 26 27 28 29 30 Đ/án D C D A C A B A C C Câu 31 32 33 34 35 Đ/án D D A C A II PART (3.0 points) Question Number mole of phosphoric acid is 1.00 x103 x103  10204.08 mol 98 Ca3(PO4)2 + 3SiO2 + C + O2 + H2O 3CaSiO3 + CO2 + 2H3PO4 5102.04 15306.12 ← 10204.08 mol m We have, the mole ratio to calcium phosphate and silica = 310   m 31 60 → silica is residual Accrording the reaction Number mole of calxium phosphate is 5102.04 mol → mass of calcium phosphate was used = 5102.04x310 = 1581632.4g Question a) Identify compounds A through F A CO2; B MgO; C C; D N2; E Mg3N2; F: NH3; (NH2)2 CO b) Write the chemical equations to represent the transformations of these compounds t Mg + CO2   MgO + C 0C t C + O2   CO2 0C t 3Mg + N2   Mg3N2 Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3 c) The interaction of A with F is a commercial method of production of a certain valuable fertilizer 0C P ,t 2NH3 + CO2   (H2N)2CO + H2O Urea fertilizer 0C Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 37 Question a) Calculate the average molar mass of the mixture: 2.27 x 28 = 63.56 g/mol Calculate the initial mass of the mixture: 63.56 x 1.92 / 22.4 = 5.448 grams b) The mass of elemental carbon: 5.448 x (100 - 12.6) / 100 = 4.762 grams Mole of C = mole of CO2 = 4.762 / 12 = 0.398 mole The volumes of CO2 = n.R.T / P = 0.398 x 0.082 x (20 + 273) / = 9.562 L c) Moles of NaOH: 400 x 1.05 x 4.82 / (100 x 40) = 0.506 mol Because < n(NaOH) / n(CO2) = 0.506 / 0.398 < so we have two salts: Na2CO3 and NaHCO3 n(Na2CO3) = 0.506 – 0.398 = 0.108 mol n(Na2CO3) = n(NaOH) - x n(Na2CO3) = 0.506 – x 0.108 = 0.290 mol The mass of the solution = 0.398 x 44 + 400 x 1.05 = 437.512 grams The mass percent of Na2CO3 is 0.108 x 106 / 437.512 = 0.0262 = 2.62% The mass percent of NaHCO3 is 0.290 x 84 / 437.512 = 0.0557 = 5.57% Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 38 ĐỀ ÔN TẬP SỐ I PART (7.0 points) Question Greenhouse gas molecules absorb ultraviolet rays from the sun Absorbing energy from these rays causes the covalent bonds in gas molecules to vibrate, compress or twist For this to happen each gas molecule must have at least three nuclei Which of the following gases is present in the atmosphere but does not cause the greenhouse effect? A nitrogen monoxide B methane C ozone D Steam Question Which of the following statements is true about the modern periodic table? A The periodic table only lists the elements that naturally exist on earth B The elements in the periodic table are arranged in order of increasing atomic mass C Elements in a period have similar sizes and similar chemical properties D Elements in a group have the same number of outermost electrons Question One study showed that enamel erosion is limited if teeth are exposed to fluoride ions Most toothpastes contain fluoride salts such as tin fluoride, sodium fluoride On the packaging of a common toothpaste, it shows that the toothpaste contains 0.41% tin fluoride by mass If a tube of the above toothpaste contains 150 grams of cream, what is the mass of the fluoride ion in that tube of toothpaste? A 0,28 B 0,17 C 0,15 D 0,07 Question Aqueous solutions of which of the following pairs of compounds will not react together to form a precipitate? A silver nitrate and ammonium iodide B sodium hydroxide and copper(II) sulfate C silver nitrate and barium chloride D sodium hydroxide and ammonium chloride Question The correct name for an aqueous solution of HCl is A chloric acid B chlorous acid C hydrochloric acid D hydrogen chloride Question Atom X has protons, 10 neutrons and electrons Atom Y has protons, neutrons and electrons Which of the following statements best describes how Atom X and Atom Y are related? A X and Y are isotopes of the same element B X is an ion and Y is a neutral atom C X and Y are different elements D X is neon and Y is fluorine Question Which of the following pairs of atoms is least likely to form a compound? A Potassium (K) and Iodine (I) B Calcium (Ca) and Chlorine (Cl) C Iron (Fe) and Sulfur (S) D Neon (Ne) and Argon (Ar) Question The reason salt crystals, such as KCl, hold together so well is because the cations are strongly attracted to A neighboring cations B the protons in the neighboring nucleus C free electrons in crystals D neighboring anions Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 39 Question Bonding between two elements of equal electronegativity would be A 100% covalent B primarily ionic C 50% ionic D metallic in character Question 10 Consider the four containers below a b c d Which container contain only: mixture, compound, element? mixture compound element A b,d a c B a,b c b C b,d c a D a,d b c Question 11 Consider the four containers below a b c d Which container contain gas, pure compound, only element? gas compound element A c a d B b d a C d b a D a c b Question 12 Identify the charge of the ions formed by each element labeled in the below periodic table Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 40 Ion formed by a Ion formed by b Ion formed by c Ion formed by d A 12+ 2+ B 1+ 221C 12+ 3+ D 22+ 2+ 1+ Question 13 Which one of the following compounds is the most acidic oxide? A Na2O B MgO C Al2O3 D SO2 Question 14 Which one of the following elements has the highest electronegativity value? A Cl B S C P D Si Question 15 One way to measure the concentration of a substance is through molality A molal solution is defined as mol of substance per kg of the solvent used to make up the solution What is the molality of a solution made by dissolving 100 g of bromothymol blue (C27H28Br2O5S) in 1.00 L of ethanol on a winter‘s day at 10ºC? The density of ethanol at this temperature is 0.7979 kg L-1 A 0.100 mol kg–1 B 0.128 mol kg–1 C 0.160 mol kg–1 D 0.201 mol kg–1 Question 16 Which one of the following bonds is the most polar? A H—F B H—O C H—N D H—Cl Question 17 Which one of the following electron configurations is not possible? A 1s2 2s2 2p6 B 1s2 2s2 2p6 3s1 C 1s2 2s2 2p6 3s2 D 1s2 2s3 2p5 3s2 Question 18 Which one of the following compounds would produce a basic 0.1 mol L–1 solution? A NaCl B NaOOCCH3 C NH4Cl D (NH4)2SO4 Question 19 Which one of the following statements correctly describes a system that has reached equilibrium? A The number of moles of product is greater than the number of moles of starting material B The number of moles of product is equal to the number of moles of starting material C The rate of the forward reaction is greater than the rate of the reverse reaction D The rate of the forward reaction is equal to the rate of the reverse reaction Question 20 How many electrons are transferred from 10 I– ions to MnO4 – ions in the following redox reaction? MnO4 – (aq) + 16 H+ (aq) + 10 I– (aq) → Mn2+(aq) + I2(s) + H2O(l) A B C D 10 Question 21 In which one of the following compounds does manganese exist in the lowest oxidation state? A Mn2O7 B Mn(CH3COO)2⋅4 H2O C KMnO4 D MnO2 Question 22 Pure water undergoes self-ionisation according to the equation: H2O(l)  H3O+ (aq) + OH– (aq) The [H3O+ ] [OH– ] constant for the reaction is: 1.0 × 10–14 at 25°C and 5.5 × 10–13 at 100°C Which one of the following statements is correct? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 41 A At 100°C the pH of pure water is less than 7.0, but the [H3O+ ] = [OH– ] B At 100°C the pH of pure water is less than 7.0, and therefore the [H3O+ ] > [OH– ] C At 100°C the pH of pure water is greater than 7.0, and therefore the [OH– ] > [H3O+ ] D At 100°C the pH of pure water must be 7.0 and the [H3O+ ] = [OH– ] Question 23 A solution of W reacts in the following ways: What could be compound W? A AgNO3 B Ag2SO4 C CaCrO4 D Pb(NO3)2 Question 24 What is the concentration of a NaOH solution, 25.0 mL of which completely reacts with 35.7 mL of a 0.126 mol L–1 H2SO4 solution? A 0.088 mol L–1 B 0.126 mol L–1 C 0.176 mol L–1 D 0.360 mol L–1 Question 25 When 1.27 g samples of the following substances are all treated with excess dilute hydrochloric acid, all give off carbon dioxide Which gives off the greatest mass of carbon dioxide? A lithium carbonate B potassium carbonate C sodium carbonate D magnesium carbonate Question 26 Which of the following species does NOT have eight electrons around the central atom? A CCl4 molecule B BCl3 molecule C CO2 molecule D NH4 + ion Question 27 mL of mol L–1 hydrochloric acid was diluted to 100 mL with deionised water 10 mL of this solution was diluted to 100 mL again using deionised water What is the pH of the final solution? A B C D Question 28 It is known that carbon monoxide reacts exothermically with hydrogen gas to form methanol at 400⁰C, in the presence of a catalyst CO (g) + 2H2 (g) CH3OH (g) + heat A mixture of carbon monoxide, hydrogen gas and methanol placed under conditions described above achieves equilibrium in a closed container If the reaction temperature is changed to 450⁰C, which of the following statements is correct? A The total number of molecules in the container decreases B The reaction rates of both the forward and reverse reactions remain constant C The average molecular mass of the gaseous mixture decreases D Rate of formation of hydrogen decreases while the rate of decomposition of methanol increases Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 42 Question 29 Consider the following three scenarios: (i) 2.3 g of pure Na2CO3 reacts completely with a certain volume, V1, of 0.1 mol L–1 hydrochloric acid to give sodium chloride, carbon dioxide and water (ii) 2.3 g of a sample containing Na2CO3 but also contaminated with some K2CO3, similarly reacts completely with a certain volume, V2, of 0.1 mol L–1 hydrochloric acid (iii) 2.3 g of a sample containing Na2CO3 but contaminated with some Li2CO3, similarly reacts completely with a certain volume, V1, of 0.1 mol L–1 hydrochloric acid What is the relationship between the volumes V1, V2 and V3? A V3>V1>V2 B V1>V2>V3 C V3>V2>V1 D V1>V3>V2 Question 30 Which of the following groups of ions can coexist in significant quantities in aqueous solution without reacting with each other? A HSO4 – , K+ , Na+ , HCO3 – B K+ , CO32– , Cl – , Al3+ C K+ , Ba2+, NO3 – , OH– D Na+ , Ba2+, H+ , SO42– Question 31 Kravatz the Klown wishes to fill a 5.8 L balloon with nitrogen gas Searching for cheap and effective methods to quickly produce the nitrogen gas necessary, he discovered that azide (N3– ) salts, although highly toxic, are often used to produce nitrogen gas Sodium azide, commonly used in car airbags, decomposes to sodium and nitrogen gas 2NaN3 → 2Na + 3N2 What mass of sodium azide would Kravatz need to produce 5.80 L of nitrogen gas when measured at 25°C and 103 kPa? A 5.22 g B 10.1 g C 10.4 g D 15.2 g Question 32 Given the following table of electronegativities, which of the following bonds is most polar? A P-S B P-C C S-Cl D C-Cl Question 33 Find the molality ( moles of soluble in per 1000 grams of slovent) of a solution of ZnSO4 whose density is 1.25 g/mL and whose molarity is 1.19 M A 0.970 B 1.12 C 0.0571 D 5.31 Question 34 Find the mass percent of ZnSO4 in a solution whose density is 1.25 g/mL and whose molarity is 1.19 M A 31.1 B 15.3 C 23.0 D 78.1 Question 35 Why is the ionic radius of a chloride ion larger than the ionic radius of a sodium ion? A A chloride ion has one more occupied electron shell than a sodium ion B Chlorine has a higher proton number than sodium C Ionic radius increases regularly across the third period D Sodium is a metal, chlorine is a non-metal Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 43 II PART (3.0 points) Exercise The aspirin substitute, acetaminophen (C8H9O2N), is produced by the following three-step synthesis: I C6H5O3N s + 3H2 g +HCl aq  C6H8ONCl s + 2H2O l II C6H8ONCl s +NaOH aq  C6H7ON s+ H2O l + NaOH aq III C6H7ON s + C4H6O3 l  C8H9O2N s + HC2H3O2 l The first two reactions have percent yields of 87% and 98% by mass, respectively The overall reaction yields mol of acetaminophen product for every mol of C6H5O3N reacted a What is the percent yield by mass for the overall process? b.What is the percent yield by mass of step III? Question Aluminium is extracted from the ore bauxite,which is impure aluminium oxide tonne (1000 kg) of the ore was found to have this composition: aluminium oxide 825 kg, iron(III) oxide 100 kg, sand 75 kg a What percentage of this ore is impurities? b tonne of the ore gives 437 kg of aluminium i How much aluminium will be obtained from tonnes of the ore? ii What mass of sand is in this tonnes? c What will the percentage of aluminium oxide in the ore be, if all the iron(III) oxide is removed, leaving only the aluminium oxide and sand? Exercise One type of stomach antacid called Rolaids contains the main ingredient NaAl(OH)2CO3 One Rolaids tablet contains 0.334 grams of the active ingredient NaAl(OH)2CO3 Another stomach antacid is called Tum, Di-Gel contains the main ingredient CaCO3 One Tums, Di-Gel tablet contains approximately 0.104 grams of CaCO3 Assume a cup of coca cola has a volume of 250 mL and pH = 3.0 If each drug is used separately, how many Rolaids pills and how many Tums, Di-Gel pills are needed to neutralize the acid in the 250 mL cup of coca cola? Please use chemical knowledge to explain why Rolaids has a superior advantage over Tums, Di-Gel when it comes to neutralizing stomach acid? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 44 ĐÁP ÁN ĐỀ ÔN TẬP SỐ I PART (7.0 points) Câu Đ/án Câu D 11 D 12 C 13 D 14 C 15 A 16 D 17 D 18 A 19 10 A 20 Đ/án A A D A D A D B D D Đ/án B A B D A B D C A C Câu 21 22 23 24 25 26 27 28 29 30 Câu 31 32 33 34 35 Đ/án C D B B A II PART (3.0 points) Exercise a What is the percent yield by mass for the overall process? Arcoding three reaction, we know that: If the percent yield by mass for the overall process is 100%, 1mol of C6H5O3N reacted, we will produce mol acetaminophen Infact, mol of acetaminophen product for every mol of C6H5O3N reacted So the percent yield by mass for the overall process is: 3/4 = 75% b.What is the percent yield by mass of step III? Let the percent yield by mass of step III be X %  87%x98%xX = 75%  x = 88%  the percent yield by mass of step III be 88 % Question a What percentage of this ore is impurities? The percentage of this ore is impurities = 100  75 100  75 x100  17.5% x100  17.5% 1000 1000 b.(i) tonne of the ore gives 437 kg of aluminium →5 tonnes of the ore gives x 437  2185 kg of aluminium (ii) tonne of the ore contains 75 kg of sand →5 tonnes of the ore contains x75  375 kg of sand c) If all the iron(III) oxide is removed, leaving only the aluminium oxide and sand → the percentage of aluminium oxide in the ore be: 825 x100  91.67% 825  75 Exercise The number of moles of H+ in cup of coca cola has a volume of 250 mL and pH = 3.0 is: 0.25 x 10-3 = 2.5x10-4 mol H+ = number of moles of HCl Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 45 - If we used Rolaids,we have reaction NaAl(OH)2CO3 + 4HCl → NaCl + AlCl3 + CO2 + 3H2O 0.625x10-4 ← 2.5x10-4 Arcoding the above reaction, moles of NaAl(OH)2CO3 is= 2.5 x104 x1  0.625 x104 mol Mass of NaAl(OH)2CO3 is = 0.625x10-4x144 = 9x10-3 g = 9mg The Rolaids are needed:  27 pills 0.334 - If we used Tums, Di-Gel we have reaction CaCO3 + 2HCl → CaCl2 + CO2 + H2O -4 1.25x10 ← 2.5x10-4 Arcoding the above reaction, moles of CaCO3 is= 2.5 x104 x1  1.25 x104 mol Mass of CaCO3 is = 1.25x10-4x100 = 12.5x10-3 g = 12.5mg The Tums, Di-Gel are needed: 12.5  120 pills 0.104 In the Rolaids contains more active ingredients than in the Tum, Di-Gel, so Rolaids has a faster effect than Tum, Di-Gel That why Rolaids has a superior advantage over Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 46 ĐỀ ÔN TẬP SỐ I PART (7.0 points) Question Consider the following differences between Hydrogen and Helium gases: While Helium is a non-flammable gas, Hydrogen is a flammable gas Helium is lighter than Hydrogen gas Which of the above statements is/are correct? A Only B Only C Both & D Neither nor Question Highest percentage of nitrogen is found in which among the following fertilizers among the given options? A Calcium ammonium nitrate B Ammonium nitrate C Calcium nitrate D Urea Question Potassium permanganate is used to purify water Which among the following properties of Potassium permanganate helps in this work? A sterilizing B oxidizing C reducing D leaching Question Which among the following is known as Quick Lime? A CaO B CaCO2 C Ca(OH)2 D CaCl2 Note: Ca(OH)2: Slakedlime Ca(OH)2: limewater Question Which of the following is an alkaline earth metal? A Pottasium B Lead C Copper D Calcium Question Which among the following is responsible for depletion of Ozone? A Carbon monoxide B Carbon dioxide C Chlorofluoro carbon D Mercuric oxide Question Which among the following is an example of a Chemical Change? A Rusting of iron B Magnetisation of iron C Melting of iron D Heating of iron Question In a sample of pure water, only one of the following statements is always true at all conditions of temperature and pressure Which one is always true? A [H3O+] = 1.0 x 10-7 M B [OH-] = 1.0 x 10-7 M C pH = 7.0 D [H3O+] = [OH-] Question The [H+] in a 0.050 M solution of Ba(OH)2 is: A 1.0 x 10-5 M B 5.0 x 10-2 M C 1.0 x 10-13 M D 5.0 x 10-10 M Question 10 Which of the following solutions has the lowest pH at 25oC? (No calculations required.) A 0.2 M sodium hydroxide B 0.2 M hypochlorous acid C 0.2 M ammonia D 0.2 M bromhydric acid Question 11 Which metal can be found as the free element? A Na B Mn C Fe D Pt Question 12 A reaction sequence for the reduction of one of the iron ores is as follows: C(coke) + O2 → CO Fe2O3 + CO → Fe + CO2 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 47 Calculate the amount of coke necessary to produce 800 g of Fe ( Known that, efficiency of the reaction is 75%) A 114 g B 1030 g C 258 g D 172 g Question 13 What is the charge on the copper ion in the mineral azurite, Cu3(CO3)2(OH)2? A 2+ B 1+ C D 1Question 14 Which of the following is NOT true for the Group 1A elements ( except H element) ? A Most of them are soft, silvery corrosive metals B Their atomic radii increases with increasing molecular weight C They are named the alkaline earth metals D They are excellent conductors of heat and electricity Question 15 Which element group is the most reactive of all the metallic elements? A alkali metals B alkaline earth metals C coinage metals D transition metals Question 16 Of the following oxides, the most basic is: A MgO B Na2O C P2O3 D SO2 Question 17 The most abundant metal in the earth's crust is: A Cu B Fe C Na D Al Question 18 What is the major mineral present in phosphate rock? A Ca3(PO4)2 B Na2HPO4 C Ca10(PO4)6F2 D NaH2PO4 Question 19 Which compound gives photochemical smog a brownish color? A NO B HNO2 C NO2 D N2O4 Question 20 Which of the following does not correctly describe ammonia? A pyramidal molecule B polar molecule C extremely soluble in water D none of these Question 21 What maximum mass of sulfuric acid can be produced from the sulfur contained in 100 kilograms of iron pyrite that is 75.0% FeS2? A 84.4 kg B 123 kg C 136 kg D 144 kg Question 22 What maximum mass of sulfuric acid can be produced from the sulfur contained in 100 kilograms of iron pyrite that is 75.0% FeS2? A 84.4 kg B 123 kg C 136 kg D 144 kg Question 23 Which of the following statements about sulfuric acid is false? A It is a strong acid B One mole of sulfuric acid reacts completely with two moles of potassium hydroxide C During the dilution of sulfuric acid, the correct method is to add water to sulfuric acid D It is often present in acid rain and sulfuric acid is used as acid in batteries Question 24 Chlorine gas is prepared commercially by: A electrolysis of carbon tetrachloride B oxidation of chloride ion with F2(g) C electrolysis of NaCl(aq) D oxidation of chloride ion with Br2(aq) Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 48 Question 25 Which of the following substances is the strongest reducing agent? A Cl2 B ClC Br2 D BrQuestion 26 Which of the following is NOT true for the halogens? A They are nonmetals B They show the -1 oxidation number in most of their compounds C Elemental halogens exist as diatomic molecules D The electronic configuration of their outermost electrons is ns2 np6 Question 27 What makes carbon such a unique element? A Elemental carbon comes in two forms, diamond and graphite B Carbon forms four bonds, although the ground state configuration would predict the formation of fewer bonds C Carbon forms covalent bonds rather than ionic bonds D Difference any other element, carbon can bond to itself to form straight chains, branched chains and rings Question 28 Hydrated copper sulphate, also known as bluestone with the chemical formula CuSO4.5H2O, is often used as an antiseptic, fungicide, herbicide and insecticide When heated CuSO4.5H2O gradually loses mass The following graph shows the decrease in mass of CuSO4.5H2O with increasing temperature The nearest composition of the solid after the temperature reaches 2000C is A CuSO4.H2O B CuSO4.4H2O C CuSO4 D CuO Question 29 A vial containing Na2SO3 solution (X solution) for a long time The concentration of Na2SO3 in solution X was determined again as follows - Experiment 1: Adding 10ml of Y solution consisting of 0.5M BaCl2 and 2.5M HCl to 5ml of X solution, 0.233 grams of white precipitate was obtained Experiment 2: Slowly add bromine water solution to 5ml of X solution until the solution has a stable light yellow color, add 10ml of Y solution, 0.699 grams of white precipitate was obtained What is the concentration of Na2SO3 in solution X? A 0,2M B 0,4M C 0,6 M D 0,8M Question 30 Complete pyrolysis of a mixture of solids X including Cu(NO3)2 and AgNO3 The obtained gas mixture was waded through cold water to obtain Y solution and 168 ml of colorless gas Z (at STP) Let Y react with a sufficient amount of NaOH solution to obtain a solution containing 9.35 grams of one salt The mass percent of AgNO3 in the mixture X is A 42,86% B 40,41% C 57,56% D 57,14% Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 49 Question 31 NH3 is an important reagent in the chemical industry, produced by the Haber-Bosch method, using a direct reaction between N2 and H2 At the condition that the molar ratio between N2 and H2 is 1:3, the temperature is 4500C the pressure is 200 atm, the iron powder catalyst, the NH3 synthesis reaction gives an yield of about 25% Which of the following statements is not true about NH3 synthesis? A Lowering the temperature, the rate of NH3 synthesis decreases B Increasing the temperature the yield of NH3 synthesis increases C Increasing the pressure the yield of NH3 synthesis increases D Iron catalyst will increase the rate of ammonia synthesis Question 32 An atom of element X has an electron configuration of 1s22s22p63s1 Which of the following properties of element X is not true? A In its pure form, X reacts with water to produce hydrogen gas B The compound of X with chlorine is an ionic compound C Atom X readily accepts an extra electron to form a stable 3s2 shell configuration D Compounds of X with oxygen are soluble in water to form a basic solution Question 33 Complete combustion of 6.20 an organic compound A requires a sufficient amount of O2 (dktc) to obtain a mixture of combustion products Lead all the combustion product into the container of Ba(OH)2 solution, 19.7 grams of precipitate appeared and the mass of solution decreased by 5.5 grams Filter out the precipitate, heat the filtrate to obtain 9.85 grams of precipitate The molecular formula of A is A C2H4O2 B C2H6O C C2H6O2 D C3H8O Question 34 What is the sum of all coefficients when the following net ionic equation is balanced using the smallest whole number coefficients possible? Do not forget coefficients of one 2MnO4- + 3Mn2+ 4OH- → 5MnO2 + 2H2O (in basic solution) A 19 B 16 C 13 D 11 Question 35 When the system A + B C + D is at equilibrium, A the sum of the concentrations of A and B must equal the sum of the concentrations of C and D B the forward reaction has stopped C both the forward and the reverse reactions have stopped D neither the forward nor the reverse reaction has stopped II PART (3.0 points) Exercise In power plants, the burning of coal produces SO2 because the coal contains a small amount of sulfur (hence sulfur is also burned) One way to remove SO2 from the flue gases of power plants is to react it with an aqueous solution of H2S One product of this reaction is sulfur and the other is water (a) How many moles of SO2 will be produced by burning 1.00 ton (1.00 ×103 kg) of coal containing 3.00% sulfur by mass? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 50 (b) Write a balanced chemical equation for the reaction between SO2 and H2S (c) What are the oxidation states of sulfur in SO2 and H2S? (d) At 25 ˚C and 100 kPa, how many liters of hydrogen sulfide (H2S) gas would be needed to remove all the SO2 formed in (a)? ( known that 100kPa = 0,987atm) (e) If the untreated flue gases of power plants are released into the environment, SO2 will react with another pollutant, NO2, to produce sulfur trioxide and nitrogen monoxide Write the reaction take place between SO2 and NO2 (g) When SO3 dissolves in atmospheric water, we get acid rain! Write a balanced chemical equation for the reaction of SO3 with water Exercise An alkaline earth metal (1.00 g) is reacted with chlorine gas to produce the resulting chloride salt (1.81 g) A solution of the salt in water gives a red flame test Identify the alkaline earth metal and give the chemical formula for the chloride salt Exercise Phosphorus and compounds of this element account for the second highest concentration in the human body A compound that is considered the main mineral component of tooth enamel, ivory and bone has the molecular formula Ca5(PO4)3(OH) (hydroxyapatite) In dentistry, this compound is coated with a metal layer (titanium - an anti-rust alloy) to facilitate implantation into the tooth This substance in powder form is used to fill in bone voids caused by accidental fractures, facilitating natural bone remodeling Hydroxyapatite is prepared by dissolving phosphoric acid in an excess dilute calcium hydroxide solution Write the chemical equation that occurs Calculate the mass of hydroxyapatite prepared from 100kg of 85% phosphoric acid solution when reacting with excess calcium hydroxide solution, the efficiency reaches 90% To help strengthen tooth enamel and prevent tooth decay, F- ions are added to bottled water at a concentration of 1.0 mg F- ions per liter of water In toothpastes, the F- ion is added in small amounts in the form of sodium fluoride (NaF) salt According to a 2013 Harvard study, children living in areas with fluorinated water had lower IQs on average than in other areas The F- ion is toxic to the nervous system With the amount: 0.2 grams of F- can be dangerous to people weighing 70kg 3.1 If a student weighs about 70kg, use water containing F- with the amount of 1mg/1 L of water to help strengthen tooth enamel and prevent tooth decay If the average volume of water this student drinks in a day is L, does the amount of F- affect health? According to the American Dental Association, an adult should take 3mg of F- daily in the form of NaF to prevent tooth decay The amount of NaF is not toxic to the body when it is below 3.19.10-2 grams / kg of body If a sample of toothpaste contains 0.28% NaF, how many grams can a person weighing 75kg swallow without affecting health? Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 51 Đề ôn tập số I PART (7.0 points) Câu 10 Đ/án A D B A D C A D C D Câu 11 12 13 14 15 16 17 18 19 20 Đ/án D D A C A B D A C D Câu 21 22 23 24 25 26 27 28 29 30 Đ/án B B C C D D D A B B Câu 31 32 33 34 35 Đ/án B C C C D II PART (3.0 points) Exercise (a) How many moles of SO2 will be produced by burning 1.00 ton (1.00 ×103 kg) of coal containing 3.00% sulfur by mass? Mass of sulfur is 1x103 x3% = 30 kg Mol of sulfur = mol of SO2 30x103 : 32 = 937.5 moles (b) Write a balanced chemical equation for the reaction between SO2 and H2S SO2(g) + 2H2S(aq)  3S(s) + 2H2O(l) (c) What are the oxidation states of sulfur in SO2 and H2S? S in SO2: +4 S in H2S: -2 (d) At 25 ˚C and 100 kPa, how many liters of hydrogen sulfide (H2S) gas would be needed to remove all the SO2 formed in (a)? ( known that 100kPa = 0,987atm) Moles of hydrogen sulfide (H2S) gas would be needed to remove all the SO2 formed in (a): 2x 937.5 = 1875 moles Volume of hydrogen sulfide at 250C and 100KPa: 1875 x 0.082 x (25+273) : 0.987 = 46420.973L (e) If the untreated flue gases of power plants are released into the environment, SO2 will react with another pollutant, NO2, to produce sulfur trioxide and nitrogen monoxide Write the reaction take place between SO2 and NO2 SO2 (g) + NO2(g)  SO3(g) + NO(g) (g) When SO3 dissolves in atmospheric water, we get acid rain! Write a balanced chemical equation for the reaction of SO3 with water SO3(g) + H2O(l)  H2SO4(aq) Exercise Suppose that earth metal is M  MCl2 M + Cl2 Mass off chlorine is reacted : 1.81 – = 0.81 g Mole of Cl2 = mole of M = 0.81: 71  Atomic mass off M = 1: ( 0.81:71) = 87.65 Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 52  M is Sr ( Strontium)  formula for the chloride salt is: SrCl2 ( Strontium chloride) Exercise Write the chemical equation that occurs 3H3PO4 + 5Ca(OH)2  Ca5(PO4)3(OH) + 9H2O Calculate the mass of hydroxyapatite prepared from 100kg of 85% phosphoric acid solution when reacting with excess calcium hydroxide solution, the efficiency reaches 90% Mass of H3PO4 = 100 x 85% = 85kg Mole of H3PO4 = 85 x 103: 98 Mole of Ca5(PO4)3(OH) : 85 x 103: 98:3 x 90% Mass of Ca5(PO4)3(OH) : 85 x 103: 98:3 x 90% x 502 =130.662x103 g = 130.622 kg 3.1 Mass of F- in 2L of water is: 2x = 2mg = 0.002 g