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CE Chemistry ~ Paper I by

Dr. Samuel Chong

ABC

04 05 (SWA)

05 06 07-08

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.

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)



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.



(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)



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)



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)



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)



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)



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)



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)



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)

by dr. samuel chong - edblog.hkedcity.netedblog.hkedcity.net/...//samuel_chong_chem_1_e.pdf ·...

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