cs chem hkdse mock section a ee

HKDSE

CS (CHEM)

SECTION A

HKDSE-CS (CHEM) A-1 (Sample Mock Paper) © Times Publishing (Hong Kong) Ltd.1

GENERAL INSTRUCTIONS

1. There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 30 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.

4. A Periodic Table is printed on page 12 of Question-Answer Book B. Atomic numbers and relative atomic masses of elements can be obtained from the Periodic Table.

5. The question paper for Section A will be collected at the end of the examination.

INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)

1. Read carefully the instructions on the Answer Sheet. After the announcement of the start of the examination, you should insert the information required in the spaces provided. No extra time will be given after the ‘Time is up’ announcement.

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. You must mark the answers clearly; otherwise you will lose marks if the answers cannot be captured.

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.

Name:

Class: （）

Date:

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TiMES PubliSHing (Hong Kong) lTD.

Hong Kong DiPloMa of SEConDary EDuCaTion ExaMinaTion

SaMPlE MoCK PaPEr

CoMbinED SCiEnCE — CHEMiSTry

(1 hour 40 minutes)

This paper must be answered in English


This section consists of 24 multiple-choice questions. Choose the best answer for each question.

Candidates may refer to the Periodic Table printed on page 12 of Question-Answer Book B.

PART I

Which of the following equations represents the complete combustion of ethane (C1. 2H6) ?

CA. 2H6(g) 2C(s) + 3H2(g)

CB. 2H6(g) + 3O2(g) CO(g) + CO2(g) + 3H2O(l)

2CC. 2H6(g) + 5O2(g) 4CO(g) + 6H2O(l)

2CD. 2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l)

A polymer has the following structure:2.

C

H

H H H H

C

C2H5

C

H

C

C2H5

H H

C

H

C

C2H5

C

H

H H

C

C2H5

What is the monomer of the polymer ?

ethyletheneA.

methylpropeneB.

but-1-eneC.

but-2-eneD.

Silver nitrate reacts with sodium bromide to give silver bromide and sodium nitrate. What type of reaction 3.

is it ?

displacement reactionA.

neutralization reactionB.

precipitation reactionC.

redox reactionD.

Copper reacts with oxygen to form copper(II) oxide. How many grams of copper(II) oxide would be 4.

formed if 63.5 g of copper reacted with excess oxygen ?

(Relative atomic masses: O = 16.0, Cu = 63.5)

63.5 gA.

79.5 gB.

95.5 gC.

143.0 gD.

HKDSE-CS (CHEM) A-3 (Sample Mock Paper) © Times Publishing (Hong Kong) Ltd.

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3

Directions: Questions 5 to 6 refer to the following information:

The pH ranges and the colours in acidic and alkaline media of four acid-base indicators are shown in the following table:

Indicator pH rangeColour in acidic

medium Colour in alkaline

medium

Congo red 3.1 – 4.9 Blue Red

Bromothymol blue 6.0 – 7.0 Yellow Blue

Thymol blue 8.0 – 9.6 Yellow Blue

Methyl blue 10.6 – 13.4 Blue Pale violet

Which of the above indicators should you use for a titration between ethanoic acid and sodium hydroxide 5.

solution ?

congo redA.

bromothymol blueB.

thymol blueC.

methyl blueD.

If one drop of the following indicators are added to pure water respectively, what colours will the water 6.

solutions be stained with ?

Congo red Bromothymol blue Thymol blue Methyl blue

blue yellow yellow blueA.

red blue blue pale violetB.

blue yellow blue pale violetC.

red blue yellow blueD.

In which of the following compounds does nitrogen show the highest oxidation number ?7.

NaNOA. 2

Ca(NOB. 3)2

(NHC. 4)2SO4

(NHD. 2)2CO


The following is a diagram for a Zn/Cu chemical cell:8.

V

Cu2+ (1 mol dm–3)Zn2+ (1 mol dm–3)

copper metal

saltbridge

zinc metal

Which of following statements concerning the zinc metal electrode is correct ?

Zn electrode is the positive terminal and the anode of the cell.A.

Zn electrode is the positive terminal and the cathode of the cell.B.

Zn electrode is the negative terminal and the anode of the cell.C.

Zn electrode is the negative terminal and the cathode of the cell.D.

The following ionic equation represents the reaction between copper(I) chloride and acidified potassium 9.

dichromate solution:

6Cu+(aq) + Cr2O72–(aq) + 14H+(aq) 6Cu2+(aq) +2Cr3+(aq) + 7H2O(l)

Which of the following statements concerning the reaction is correct ?

The resulting solution is green in colour.A.

HB. +(aq) is the oxidizing agent.

CuC. +(aq) is oxidized in the reaction.

The oxidation number of Cr has increased.D.

Given that the standard enthalpy change of formation of carbon dioxide is 10. y and the standard enthalpy change of combustion of carbon monoxide is z. Which of the following has the same value as the standard enthalpy change of formation of carbon monoxide ?

12

A. y

12

B. z

y C. – z

z D. – y



5

How many electrons does a nitride ion (N11. 3–) have ?

3A.

7B.

8C.

10D.

An exothermic reaction proceeds by two stages. Which of the following diagrams correctly represents the 12.

energy profile of the reaction ?

A.Enthalpy

Reaction coordinate

B.Enthalpy

Reaction coordinate

C.Enthalpy

Reaction coordinate

D.Enthalpy

Reaction coordinate

Which of the following compounds would decolourize acidified potassium permanganate solution ?13.

propene(1)

propanol(2)

propanal(3)

(1) and (2) onlyA.

(1) and (3) onlyB.

(2) and (3) onlyC.

(1), (2) and (3)D.


The following table shows information concerning particles 14. A and B:

Particle Number of neutrons Number of protons Number of electrons

A 10 9 10

B 10 11 10

Which of the following statements concerning both particle A and particle B is correct ?

They are atoms of metals.A.

They are atoms of non-metals.B.

They are ions.C.

They are isotopes of the same element.D.

Four students each titrated 25.0 cm15. 3 of 0.1 M sodium hydroxide solution in a conical flask (delivered from a pipette) against 0.1 M hydrochloric acid (delivered from a burette) using the same acid-base indicator. The results are as follow:

Student Volume of hydrochloric acid used (cm3)

A 24.8

B 25.0

C 25.0

D 27.0

Which of the following is a possible explanation of the result obtained by student D ?

Student A. D rinsed the burette with water only but not with hydrochloric acid.

Student B. D rinsed the burette with water and then with hydrochloric acid.

Student C. D rinsed the pipette with water only but not with sodium hydroxide solution.

Student D. D rinsed the pipette with water and then with sodium hydroxide solution.

Consider the following experiment:16.

microscopic slidefilter paper

crocodile clips

potassiummanganate (VII)crystal

power supply

What is the aim of this experiment ?

to show that potassium manganate(VII) is an oxidizing agentA.

to show that potassium manganate(VII) is a reducing agentB.

to show that potassium manganate(VII) consists of ionsC.

to show that potassium manganate(VII) consists of moleculesD.



7

Directions: Questions 17 to 18 refer to the following information:

A student put 1.0 g of lithium pellets into 100 g of water at 19.6°C in a polystyrene cup. The mixture was stirred until all lithium pellets were dissolved. The highest temperature recorded by the student after mixing was 34.8°C.

(Specific heat capacity of final solution = 4.2 J g–1 K–1; Specific heat capacity of water = 4.2 J g–1 K–1;

Relative atomic masses: H = 1.0, Li = 6.9, O = 16.0)

Which of the following equations represents the reaction between lithium and water ?17.

Li(s) + HA. 2O(l) Li(aq) + H2O(l)

Li(s) + HB. 2O(l) LiO(aq) + H2(g)

2Li(s) + 2HC. 2O(l) 2LiOH(aq) + H2(g)

4Li(s) + 2HD. 2O(l) 4LiH(aq) + O2(g)

What is the enthalpy change of reaction per mole of lithium ?18.

–6.4 kJ molA. –1

–6.5 kJ molB. –1

–44.0 kJ molC. –1

–44.5 kJ molD. –1

Carbon monoxide gas is19.

colourless.(1)

harmless.(2)

odourless.(3)

(1) and (2) onlyA.

(1) and (3) onlyB.

(2) and (3) onlyC.

(1), (2) and (3)D.

Which of the following statements concerning both hydrogen and chlorine are correct ?20.

Both of them are gases at room temperature and pressure.(1)

Both of them are products of electrolysis of sea water.(2)

They react to form hydrochloric acid.(3)

(1) and (2) onlyA.

(1) and (3) onlyB.

(2) and (3) onlyC.

(1), (2) and (3)D.


Which of the following statements concerning quartz are correct ?21.

Quartz is a mineral.(1)

Quartz is an element.(2)

Quartz is a component of granite.(3)

(1) and (2) onlyA.

(1) and (3) onlyB.

(2) and (3) onlyC.

(1), (2) and (3)D.

The following diagram shows the fractional distillation of crude oil:22.

150°C

200°C

300°C

370°C

400°C

crude oil

furnace

X

Y

Which of the following statements concerning X and Y are correct ?

Y(1) is more viscous than X.

Y(2) is darker in colour than X.

Y(3) burns more easily than X.

(1) and (2) onlyA.

(1) and (3) onlyB.

(2) and (3) onlyC.

(1), (2) and (3)D.


Compared with Group I metals, Group II metals of the same period23.

are generally more reactive.A.

are more shiny.B.

have a lower melting point.C.

have a higher density.D.

The following table shows the enthalpy changes of combustion of hydrogen and methane:24.

Gas EquationEnthalpy change of

combustion (kJ mol–1)

Hydrogen 2H2(g) + O2(g) 2H2O(l) –285.8

Methane CH4(g) + 2O2(g) CO2(g) + 2H2O(l) –890.4

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0)

Which of the following statements concerning the combustions of hydrogen and methane is correct ?

For the same number of moles of gases, hydrogen uses up more oxygen.A.

For the same number of moles of gases, hydrogen gives out more heat.B.

For the same volume of gases, hydrogen gives out more heat.C.

For the same mass of gases, hydrogen gives out more heat.D.

END OF SECTION A


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uSE H.b. PEnCilS

答題紙 anSWEr SHEET

DSE

考生須照下圖所示填畫答案：

23 A B C D

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Mark your answers as follows:

23 A B C D

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cs chem hkdse mock section a ee

Documents

relative atomic masses

sample mock paper

sodium hydroxide solution

specific heat capacity

standard enthalpy change

equations represents

periodic table

enthalpy change