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CE Chemistry ~ Paper I by
Dr. Samuel Chong
ABC
04 05 (SWA)
05 06 07-08
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2010-CE
CHEM
PAPER 1
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION 2010
CHEMISTRY PAPER 1
Question-Answer Book
(13/4 hours)
This paper must be answered in English
1. This paper consists of TWO sections, Section A and Section B.
Section A carries 54 marks and Section B carries 36 marks.
2. Answer ALL questions in each section. Write your answers in the spaces
provided in this Question-Answer Book.
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2010 CE chemistry mock exam
CE Chemistry by Dr. Samuel Chong 2
Section A
1.(a) Complete the following table:
Iodine C60 Quartz
(i) Electrical
conductivity
(ii) type of
structure
(b) Draw the experimental setup you would use to separate pure iodine from a
mixture of iodine and quartz. Explain the underlying principle of the set-up. You
may use common apparatus in school laboratory.
(6 marks)
2.(a) An iron cooking pan is used to cook acidic food frequently, it gradually
becomes thinner.
(i) Write an ionic equation to explain the above phenomenon.
(ii) Suggest an alternative material for manufacturing the pan to solve the
problem.
(b) Pass hydrogen gas through combustion tube containing CuCl2 solid with
heating.
(i) State the type of reaction.
(ii) Why high purity of copper is obtained?
(c) Suggest TWO advantages of using aluminum to manufacture potato chip bags.
(6 marks)
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2010 CE chemistry mock exam
CE Chemistry by Dr. Samuel Chong 3
3. Complete the following table concerning tests for different ions.
Compound Test and positive result
of cations
Test and positive result
of anions
(i) Potassium chloride Test:
Result:
Test:
Result:
(ii) __________sulphate Test: warm with sodium
hydroxide solution
Result: release gas which
turns moist red litmus
paper blue
Test:
Result:
(iii) _________carbonate Test: flame test
Result: brick red flame
Test:
Result:
(6 marks)
4. The following diagram shows the electrolysis of aluminum oxide ore.
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2010 CE chemistry mock exam
CE Chemistry by Dr. Samuel Chong 4
(a) Write the ionic half equations of the anode and cathode.
(b) Calculate the mass of aluminum formed from 1500 kg aluminum oxide.
(c) Describe and explain the change of graphite electrodes after a period of time.
(d) Suggest one property of aluminum making it more and more popular than iron
nowadays.
(6 marks)
5. With reference to the following conversions:
(a) Write balanced chemical equations for reaction A to D respectively with
appropriate reactants and products.
(b) State reaction C is an exothermic or endothermic reaction.
(c) Which type of reaction C is?
(6 marks)
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2010 CE chemistry mock exam
CE Chemistry by Dr. Samuel Chong 5
6. A gaseous mixture of propene, oxygen and carbon dioxide is passed through the
following set-up.
(a) Which of the above substances in the mixture would react with potassium
hydroxide solution? Explain briefly.
(b) Which of the above substances in the mixture would react with bromine water?
Write the chemical equation of the reaction.
(c) State the remaining gas.
(d) Draw the setup on the diagram which is connected to the delivery tube in order
to collect the remaining gas.
(6 marks)
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CE Chemistry by Dr. Samuel Chong 6
7.
(a) Name the green solution A. Write an ionic equation from A to B.
(b) Explain the colour change from B to C. Name the type of reaction.
(c) Briefly describe process F.
(d) Name precipitate E.
(e) State the observable change if sulphur dioxide gas is added to yellow solution C.
Explain in terms of equation.
(9 marks)
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CE Chemistry by Dr. Samuel Chong 7
8. Essay:
A student wants to compare the concentration (mol dm-3
) of ethanoic acid in brand
A and brand B vinegar. Suggest the experimental procedure to determine the
molarity of ethanoic acid in the two brands. You may use common apparatus in
the school laboratory.
(9 marks)
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CE Chemistry by Dr. Samuel Chong 8
Section B
9.(a) A student wrote a few statements about butane.
But-1-ene reacts with hydrogen to form butane. Butane undergoes substitution
reaction with bromine to form 2-bromobutane.
State TWO mistakes of the statements.
(b) State reagent used in the conversion of butan-1-ol to butanoic acid.
(c)(i) Draw the structure of an isomer of butanoic acid
(ii) State 2 organic compounds that react to give the above isomer.
(iii) Compare the boiling points of
(I) butan-1-ol and butane. (Explain your answer in term of attractive force.)
(II) butane and methyl propane.
(Explain your answer in terms of attractive force.)
(9 marks)
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CE Chemistry by Dr. Samuel Chong 9
10. An alkanoic acid of mass 5g undergoes complete combustion and the gaseous
products are passed through two conical flasks containing sodium hydroxide
solution(flask A) and anhydrous calcium chloride(flask B) respectively. The
following table shows the result of the experiment.
Flask A Flask B
Initial mass 12.3g 16.8g
Final mass 19.76g 19.09g
(a) Find empirical formula of the alkanoic acid.
(b) Given the molecular mass of the alkanoic acid is 118, deduce the structure of
the acid.
(c) The alkanoic acid can be used to manufacture polymer in daily life. For
example, benzene-1,4-diamine will be used to form polymer with the alkanoic
acid in (b). Write a chemical equation of the polymerization.
(Hint: structure of benzene-1,4-diamine NH2H2N )
(d) Explain why the above polymer formed is biodegradable?
(e) State another polymer which has the same thermal property as the above
polymer.
(9 marks)
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CE Chemistry by Dr. Samuel Chong 10
11. (a) Compare and explain briefly the observation when adding chlorine bleach and
sulphur dioxide on moist blue litmus paper respectively.
(b) Explain why newspaper turns yellow after a period of time.
(c) With reference to the following experimental set-up, answer the following
questions.
(i) Write a chemical equation of the reaction between acidified potassium
permanganate solution and sodium chloride solution.
(ii) Explain the function of sulphurous acid.
(iii) State the function of the inverted filter funnel.
(9 marks)
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CE Chemistry by Dr. Samuel Chong 11
12. Essay:
There is a chemical waste containing sodium chloride solution, ester,
1,1,1-trichloromethane and distilled water. Suggest how you would separate the
above substances and explain the principles of the methods used.
(9marks)
Samuel_Chong_CE_Chem_P1(E)Dr. Samuel Chong
long Q ming (eng)