bai tap ngu phap tieng anh lop 8 co dap an

Ngày tải lên: 17/08/2014, 16:07

... Na 2 CO 2  CaCO 3 + 2NaCl b b b  CaCl 2 + NaHCO 3 không phản ứng . m 1 = 100b  Thêm (a+b)mol Ca(OH) 2  Ca(OH) 2 + Na 2 CO 3  CaCO 3 + 2NaOH b b b  Ca(OH) 2 + NaHCO 3 ... HCl . Cho tác dụng với CO 2  CaO + CO 2  CaCO 3  Cu + CO 2  Al 2 O 3 + CO 2  Fe + CO 2  2NaOH + CO 2  Na 2 CO 3 + H 2 O Bài giải  CaO + H 2  CuO + H 2  Cu + H 2 O ... là CO 2 thu lấy . Viết PTHH . Cô cạn dd CaCl 2 , Ca(OH) 2 đến khan , sau đó cho tác dụng với H 2 SO 4 đậm đặc , đun nóng thu khí HCl . Cho tác dụng với CO 2  CaO + CO 2  CaCO 3 ...

Ngày tải lên: 03/06/2013, 01:25

... gian nói trên b. Tính cường độ dòng điện trong mạch trong khoảng thời gian nói trên ĐS:a. e tc =12V; b.I=0 Bài 10:Một thanh kim loại dài 1m trượt trên hai thanh ray nằm ngang như hình vẽ.Thanh Kim ... Bài 32: Thanh MN dài l = 20 (cm) có khối lượng 5 (g) treo nằm ngang bằng hai sợi chỉ mảnh CM và DN. Thanh nằm trong từ trường đều có cảm ứng từ B = 0,3 (T) nằm ngang vuông góc với thanh có chiều ... thanh có thể chịu được lực kéo tối đa là 0,04 (N). Dòng điện chạy qua thanh MN có cường độ nhỏ nhất là bao nhiêu thì một trong hai sợi chỉ treo thanh bị đứt. Cho gia tốc trọng trường g = 9,8...

Ngày tải lên: 01/07/2014, 14:00

Ngày tải lên: 24/10/2014, 16:00

Ngày tải lên: 10/11/2014, 20:00

... good conditions for trees and animals j. to see animals and study trees k. an English –speaking club l. care of abondaned animals 4 Lesson plan of 10 grade – Extensive lesson – Ha Thi Phuong Lan ... covers 23) We can go to the National Park to learn about the different ……………………… of animals and plants. A. means B. sorts C. types D. species 24) The ………………………. has threatened many of the animals in ... along the border between the United Sates and Canada, Niagara Falls actually consists of two falls, the American Falls and the Horseshoe Falls. The American Falls is on the US side of the border,...

Ngày tải lên: 20/07/2013, 01:25

... Italian big green cheap cold bad C) Read the questions & answers about ALAN and ask and answer about JUDITH. Questions: ALAN 1. What does Alan do? 1. Alan’s a lorry driver. 2. How old is Alan? ... Toast and coffee. J) Read about Lucian and Estelle and write the questions: Lucian and Estelle are from London, but they live in Madrid. They work for Opel, the car factory. Lucian and Estelle ... (+) 10.Cows ……… insects. They ……. mammals. (- / +) 20. Susan and I ……… teachers. We ……… students. (- / +) C) Fill in the blanks using “AM, IS, ARE, AM NOT, ISN’T, AREN’T”: 1. Germany, England, and...

Ngày tải lên: 24/09/2013, 00:40

... trong cái chai này?) a/ an/ some/ any/ a lot of/ lots of/: - a/ an : dùng trước danh từ số ít.( an đặt trước danh từ bắt đầu là 1 nguyên âm) - a lot of = lots of = many = much : nhiều Ex: ... much + danh từ không đếm được + do / does + S+ need / want? S + need(s)/want(s) + some / ………. + N * How many + danh từ đếm được số nhiều + do / does + S + need / want? S + need(s)/want(s) + ... -Give the correct adjectives in comparison: 1-Hanh is the _________ student in the class. (clever) 14 Miss Thanh: ………………………….go to school ? Phuong : I go to school by bike. Ex5: Khoanh tròn 1...

Ngày tải lên: 24/05/2014, 20:11

Ngày tải lên: 11/07/2014, 13:05

Ngày tải lên: 11/07/2014, 13:45

... passage below and choose one correct answer for each question. Marie Curie, the Polish-born chemist, was a courageous and determined woman. She was born on November 7 th , 186 7. she left her ... She will come even if you don’t invite her. D. She won’t come though you don’t invite her. Exercise 8: Fill each gap with one suitable word. The country and the city have advantages and …… (1) ... scientifically 32. We must send ………….aid to the refugees. A. human B. humanism C. humane D. humanitarian 33. Nowadays, more and more young people want to have a university …… . A. educate B. education...

Ngày tải lên: 13/07/2014, 07:20

Ngày tải lên: 01/06/2013, 08:47

... him sandwiches at lunch time 81 ) They were continually asking questions 82 ) We have to pick fruit very early in the morning 83 ) How many books do you give me? 84 ) He always lost keys 85 ) ... police 1 58) I believed one of the dogs had discovered some cannabis 159) The cashier used to do the accounts 160) The computer can do all the accounts 161) My dictionary doesn't give any example ... 196) You can't wear this shirt because it is very small 197) The government is launching an anti - smuggling campaign 1 98) He can speak 4 foreign languages 199) She used...

Ngày tải lên: 19/08/2013, 14:47

... .December 29) ………is an informal word for father. 30) Do you have any brother or……… ? 31) How old is your …………? He is very old. He is 84 years old and he lives with my grandmother. 32) Your ... It is a quarter past nine in the morning/am. 38) 08: 15 39) 09:00 40) 10:30 13) You lick an ice cream with your ……… 14) I have five …… on my hand. 15) The teacher has a blonde ……. 16) Is your ... trees in…………. 57) It is very cold in …………… 58) It is very …… in summer.  Vocabulary: 59) What is the………… today? Today is ………. …………2010. 60) How do we call Saturday and Sunday? ………………… 61) The...

Ngày tải lên: 19/08/2013, 14:47

... people 1. An email is a letter which/ that is sent from one computer to another. 2. Fax transmission 3. A package 4. A postman tranaigv@gmail.com ã In a noun compound Mrs. Ly is my dancing teacher. ã ... telephoned. Subject and verb agreement ã Two subjects connected by both … and … take a plural verb. Both Tam and Dan work for an instruction company. ã When two subjects are connected by not only ... also very common in many places (3) ……………… coastal land is very close to sea level, and therefore vulnerable. During hurricanes or other large storms, waves may be much higher than normal, and super-low...

Ngày tải lên: 13/09/2013, 20:10

... "Grey." A. What color is it B. What are their colors C. What color has it D. Is it grey 47. does your grandmother live with? A. Who B. Whom C. Where D. A & B are correct 48. What does this ... wants to see me. A. Whose B. Where C. Which D. Why 6. _____________ don't you want to come? -I don't like discos. A. Where B. Why C. Whose D. Which 7. _____________ do you want to come? ... that best completes each sentence: 1. I enjoy _________ alone. A. be B. to be C. being D. to have been 2. Would you like _______to the party? A. to come B. come C. coming D. to have come 3. Do...

Ngày tải lên: 15/10/2013, 21:24