Đề thi Olympic hóa toàn quốc 2003 doc
Đề thi Olympic hóa toàn quốc 2003 doc
... ĐỀ THI OLYMPIC HÓA HỌC SINH VIÊN TOÀN QUỐC NĂM 2003
Phần Hóa Đại Cương và Vô Cơ Khối B
Thời gian: 180 phút
Ngày thi: 23 – 4 – 2003
Câu 1:
1) Trình bày cấu ... và phương pháp MO (vẽ giản đồ năng
lượng). Cho Z
C
= 6; Z
O
= 8.
2) So sánh năng lượng ion hóa giữa các nguyên tử C và O, giữa phân tử CO với nguyên tử O.
3) Người ta giải thích như thế
Đề thi Olympic Hoá học quốc tế lần thứ 01 đến 05
...
excess of a 10 % sodium hydroxide solution. In this case 0.896 dm
3
of a gas were also
evolved but 0.96 g of an undissolved residue remained.
In the third experiment, 1.52 g of the initial mixture ... as hydrogen. This mixture with a volume of 16.8 dm
3
was
hydrated and 350 g of the solution were obtained when the products of hydration were
absorbed in water. Ten grams of this solution...
Đề thi Olympic Hoá học quốc tế lần thứ 06 đến 10
... weighed. After subtracting the weight of the empty flask, the mass of the gas inside
was determined. This procedure was repeated with nitrogen. Thus the following Table of
data was obtained:
Gas ... assumption: Only hydrogen is evolved at the cathode and at the same
time oxygen at the anode. On this assumption the amounts of substances of the
evolved oxygen and hydrogen are as follows:...
Đề thi Olympic Hoá học quốc tế lần thứ 11 đến 15
... Diphenyl 70 -
Anthracene 216 - Styrene - 146
MERCAPTANS – THIOPHENOLS
n-Amylmercaptan - 126 p-Thiocresol - 200
Thiophenol - 169 p-Bromothiophenol 74 -
PHENOLS
p-Cresol 36 200 o-Nitrophenol ... colouration
Name: The above reactions, the solubility behaviour and the melting range indicate that
this substance is D-fructose, a building block of cane sugar.
CH
2...
Đề thi Olympic Hoá học quốc tế lần thứ 16 đến 20
... thoroughly. Fill the burette with
the standard sodium thiosulphate solution using one of the beakers provided. (The exact
concentration of the thiosulphate is given on the label of the bottle.) ...
4.3
Calculate the rate constant for this reaction at the four temperatures given in the
table.
4.4
Calculate the average value of the activation energy for this reaction. You should
take th...
Đề thi Olympic Hoá học quốc tế lần thứ 21 đến 25
... When the crystals have been air
dried, transfer the product to the small glass dish labeled C. This dish has previously been
weighed. The dish containing the product should be given to a technician ... PROBLEMS
PROBLEM 1
(Practical)
Synthesis involving Carbanions Chalcone
The aim of this experiment is to condense acetophenone and benzaldehyde in a
mixed aldol condensatio...
Đề thi Olympic Hoá học quốc tế lần thứ 26 đến 30
... attributed to a vibration mode of a bond formed
by Te atom. This band lies at 133 cm
-1
and is therefore so low in energy that this bond
undoubtedly is a kind of Te – Te interaction. The
27
Al ... the number of moles
of helium formed within time
t
. If we assume that all radon atoms formed from radium
atoms decayed during the time of experiment (this assumption follows from the
assump...
Đề thi Olympic Hoá học quốc tế lần thứ 31 đến 35
... reaction flask. Shake well.
8. Titrate the remaining iodine with standard thiosulphate solution.
9. Record the volume of the thiosulphate solution.
10. Repeat the above steps (Steps 3 to 9) for ... by Anton Sirota
ICHO International Information Centre, Bratislava, Slovakia
779
THE THIRTY-THIRD
INTERNATIONAL CHEMISTRY OLYMPIAD
6–15 JULY 2001, MUMBAI, INDIA
______________________...
Đề thi Olympic Hoá học quốc tế lần thứ 36 đến 40
... Germany. Since the
concrete walls and the roof of the house are relatively thin (20.0 cm) there will be a loss of
energy. This energy is released to the surroundings (heat loss released to water ... Hydrolysis
D,L-Phenylglycine
Rh catalyst
HCOONH
4
(Andeno Process)
Benzaldehyde D,L-phenylglycine Benzoylformic acid
In this experiment, you are going to synthesize racemic D,L-phenylglyci...