CHEMISTRY PAPER 1 - HKEAA

HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION

CHEMISTRY PAPER 1

(Sample Paper)

Time allowed: 2 hours 30 minutes This paper must be answered in English.

GENERAL INSTRUCTIONS 1. There are TWO sections, A and B, in this Paper. Section A carries 36 marks and Section B carries 84

marks. You are advised to finish Section A in about 45 minutes and Section B in about 105 minutes. 2. Section A consists of multiple-choice questions in this question book, while Section B contains

conventional questions printed separately in Question-Answer Book B. 3. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B

should be written in the spaces provided in Question-Answer Book B. The Answer Sheet for Section A and the Question-Answer Book for Section B must be handed in separately at the end of the examination.

SECTION A (MULTIPLECHOICE QUESTIONS)

INSTRUCTIONS FOR SECTION A 1. Read the instructions on the Answer Sheet carefully. Stick a barcode label and insert the information

required in the spaces provided. 2. When told to open this book, you should check that all the questions are there. Look for the words `END OF

SECTION A' after the last question. 3. All questions carry equal marks. 4. ANSWER ALL QUESTIONS. You are advised to use an HB pencil to mark all the answers on the Answer

Sheet, so that wrong marks can be completely erased with a clean rubber. 5. You should mark only ONE answer for each question. If you mark more than one answer, you will receive

NO MARKS for that question. 6. No marks will be deducted for wrong answers.

HKDSE-CHEM 1A-1 (Sample Paper)

Not to be taken away before the end of the examination session

51

This section consists of two parts. There are 24 questions in PART I and 12 questions in PART II. Choose the best answer for each question.

Candidates may refer to the Periodic Table printed on the back of this Question Book.

PART I

1.

Upon cracking, one molecule of decane (C10H22) gives two molecules of propene and one molecule of an

alkane ( X ). What is X ?

A.

C4H6

B.

C4H10

C.

C7H14

D.

C7H16

2.

In which of the following compounds does sulphur exhibit the lowest oxidation number ?

A.

Na2S2O3

B.

MgSO4

C.

KHSO3

D.

H2S2O7

3.

Which of the following correctly describes the sequence of procedures to separate sand, salt and water

from a mixture of sand and salt solution ?

A.

filtration, evaporation

B.

filtration, distillation

C.

crystallisation, filtration

D.

crystallisation, filtration, distillation

4.

The structure of polymer X is shown below.

H CH3 H CH3 H CH3

...

CCCCCC

...

H CH3 H CH3 H CH3

What is the monomer of X ?

A.

1,1-dimethylethene

B.

1,2-dimethylethene

C.

methylpropene

D.

but-1-ene

HKDSE-CHEM 1A-2 (Sample Paper)

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Directions: Questions 5 to 6 refer to the following experiment.

Rust indicator containing potassium hexacyanoferrate(III) solution was poured into the following glass dishes to cover the iron nails, which were wrapped with different metal strips. The dishes were allowed to stand in air for some time.

silver strip dish 1

zinc strip dish 2

copper strip dish 3

magnesium strip dish 4

5.

If the iron nail rusts, what would the colour of the rust indicator be around the nail ?

A.

yellow

B.

brown

C.

red

D.

blue

6.

In which of the dishes would the iron nail rust ?

A.

dish 1 only

B.

dish 2 only

C.

dish 1 and dish 3 only

D.

dish 2 and dish 4 only

7.

The atomic number of an element X is 18. An atom of X has a mass number of 40. The atom has

A.

18 protons, 22 neutrons and 18 electrons.

B.

18 protons, 22 neutrons and 22 electrons.

C.

18 protons, 40 neutrons and 18 electrons.

D.

22 protons, 22 neutrons and 18 electrons.

8.

The following hazard warning labels are displayed on the reagent bottle of an acid.

CORROSIVE

OXIDISING

What information about this acid can be obtained from the labels ?

A.

It is very concentrated and flammable.

B.

It is very concentrated and oxidising.

C.

It is flammable and corrosive.

D.

It is corrosive and oxidising.

HKDSE-CHEM 1A-3 (Sample Paper)

53

9.

Which of the following statements concerning alkenes is INCORRECT ?

A.

They can decolourise a solution of bromine.

B.

They can decolourise red litmus solution.

C.

They can decolourise acidified potassium permanganate solution.

D.

They can be polymerised to form addition polymers.

10. Which of the following reactions is endothermic ?

A.

Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)

B.

CaCO3(s) + 2H+(aq) Ca2+(aq) + H2O(l) + CO2(g)

C.

2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(l)

D.

C9H20(l) C2H6(g) + C3H6(g) + C4H8(g)

11. Element X has three isotopes, 206X, 207X and 208X. The graph below shows the relative abundances of the isotopes.

70

60

relative abundance (%)

50

40

30

20

10

0

206

207

208

What is the relative atomic mass of X ?

A.

206.8

B.

207.0

C.

207.3

D.

207.5

HKDSE-CHEM 1A-4 (Sample Paper)

54

12. Which of the following combinations concerning the set-up shown below is correct after a current has flowed through the external circuit for some time ?

V

silver rod

copper rod

copper(II) sulphate solution

Mass of anode Colour of copper(II) sulphate solution

A.

increases

B.

decreases

C.

increases

D.

decreases

no change no change becomes lighter becomes lighter

13. Standard enthalpy changes of several reactions, as denoted by x, y and z respectively, are listed in the table below.

Reaction

C(s) + O2(g) CO2(g)

H2(g) +

1 2

O2(g)

H2O(l)

C(s) + 2H2(g) CH4(g)

Standard enthalpy change / kJ mol?1 x y z

For the reaction CH4(g) + 2O2(g) CO2(g) + 2H2O(l), which of the following is a reasonable estimate of its standard enthalpy change ?

A.

x+ y? z

B.

?x ? y + z

C.

x + 2y ? z

D.

?x ? 2y ? z

14. 500 cm3 of calcium hydroxide solution contains 3.7 g of calcium hydroxide. What is the molarity of the solution ?

(Relative atomic masses : H = 1.0, O = 16.0, Ca = 40.1)

A.

0.05 M

B.

0.10 M

C.

0.13 M

D.

0.26 M

15. Which of the following samples of gases contains the smallest number of molecules ?

(Relative atomic masses : H = 1.0, C = 12.0, N = 14.0, O = 16.0, S = 32.1)

A.

10 g of NO2

B.

10 g of CO2

C.

10 g of H2S

D.

10 g of C2H4

HKDSE-CHEM 1A-5 (Sample Paper)

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