CHEMISTRY PAPER 1 - DSEPP...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

2012-DSE CHEM

PAPER 1A

HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY

HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 2012

CHEMISTRY PAPER 1

8.30 am - 11.00 am (2 hours 30 minutes)

This paper must be answered in English

GENERAL INSTRUCTIONS

1. There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 45minutes.

2. Section A consists of multiple-choice questions in this question paper, while Section B containsconventional questions printed separately in Question-Answer Book B.

3. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers toSection B should be written in the spaces provided in Question-Answer Book B. The AnswerSheet for Section A and the Question-Answer Book for Section B will be collectedseparately at the end of the examination.

4. A Periodic Table is printed on page 20 of Question-Answer Book B. Atomic numbers and relativeatomic masses of elements can be obtained from the Periodic Table

INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)

1. Read carefully the instructions on the Answer Sheet. After the announcement of the start of theexamination, you should first stick a barcode label and insert the information required in the spacesprovided. No extra time will be given for sticking on the barcode label 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 theAnswer Sheet, so that wrong marks can be completely erased with a clean rubber. You must markthe 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 willreceive NO MARKS for that question.

6. No marks will be deducted for wrong answers.

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

20I2-DSE-CHEM IA-I 4

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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 page 20 of Question-Answer Book B.

PARTI

1. Which of the following substances CANNOT conduct electricity?

A. Pt(s)B. PbBri(l)C. C(graphite)D. CH3C比OH(l)

2. A small amount of a powder can dissolve in water to form a clear solution. When this solution is mixedwith K2COJ(aq), a white precipitate is obtained. What can the powder be ?

A. sodium sulphateB. calcium sulphateC. sodium hydroxideD. calcium hydroxide

3. In an oxide of metal M, the mass percentage ofM is 55.0%. What is the chemical formula of this oxide?

(Relative atomic masses: 0 = 16.0, M = 39.1)

A. M02

B 叱OC. M凸D. M203

4. Which of the following statements concerning CH3COOH and HCI is correct?

A. C比COOH is a stronger acid than HCLB. The pH ofO.l M鸊COOH(aq) is lower than that ofO. l M HCl(aq).C. Both CH3COOH(aq) and HCl(aq) react with NHJ(aq), each giving a salt.D. Both CH3COOH(aq) and HCl(aq) react with Ag(s), each giving a colourless gas.

5. Which of the following molecules is polar?

; �'

2012-DSE-CHEM lA-2 5


6. What is the oxidation number of Cu in Cu(NH3)氙？

A. 0B. +2C. +4D. +6

7. The standard enthalpy changes of combustion of some substances are shown below :

Substance 比(g)C(graphite) CH3CH20H(l)

Standard enthal chan e of combustion at 298 K / k」mol一

-286 一394

-1371

The standard enthalpy change of formation at 298 K ofCH3CH20H(l) is

A. -275 kJ mol- .B. +275 kJ moi-1.C. +691 kJ mol-1.D. -3017 kJmol

一

·

8. Silicon and carbon react to form silicon carbide. The crystal structure of silicon carbide is similar to thatof diamond. Silicon carbide is very hard because

A. it has a high melting point.B. silicon atoms and carbon atoms form triple bonds.C. it has a giant network structure with strong covalent bonds.D. both silicon and carbon atoms have four outermost shell electrons.

9. Which of the following statements concerning an aluminium ore consisting mainly of Alz03 is correct ?

(Relative atomic masses: 0 = 16.0, Al= 27.0)

A. Carbon can be used to extract aluminium from this ore.B. The abundance of this ore in the earth crust is very low.C. This ore contains more than 55% of aluminium by mass.D. Aluminium can be extracted from this ore due to the advancement of technology in

applying electricity.

10. A sample of 1.02 g of potassium hydrogenphthalate (C晶04K) is dissolved completely in distilled water,and then diluted to 250.0 cm3. What is the concentration of the solution obtained?

(Relative atomic masses: H = 1.0, C = 12.0, 0 = 16.0 K = 39.1

A. 0.004 MB. 0.010 MC. 0.020MD. 4.080M


）


11. Compound X has the following structure :

CH2=CHCH20H

The systematic name of X is

A. prop-l-en-3-ol.B. prop-2-en-l-ol.C. 3-hydroxypropene.D. l-hydroxyprop-3-ene.

12. Which of the following molecules is planar?

A. BF3B. NH3C. CH4D. PCl5

13. The tendency of being reduced of six ionic species increases in the order as shown below :

Ba2\aq) < Na+(aq) < Mg汽aq) < H\aq) < Cu2\aq) < Hg吖aq)

Which of the following statements is correct?

A. Ba(s) does NOT react with H\aq).B. Na(s) has a stronger reducing power than Hg(l)C. Hg吖aq) is the weakest oxidising agent among the six species.D. Displacement reaction occurs when Cu(s) is immersed in MgS04(aq).

14. Which of the following pairs of reactants would react in water to give out the largest amount of heat?

A. 1 mol ofHCl and 1 mol of KOHB. 1 mol ofH2S04 and 2 mol of KOHC. 1 mol of(COOH)2 and 2 mol of KOHD. 1 mol ofCH3COOH and 1 mol of KOH

15. Which of the following statements concerning an 1311 atom and a 131Xe atom is I are correct?

(1) They have the same number of protons.(2) They have different numbers of neutrons.(3) They have different numbers of outermost shell electrons.

A. (1) onlyB. (2) onlyC. (1) and (3) onlyD. (2) and (3) only

2012-DSE-CHEM IA-4 7


16. Which of the following combinations is/ are correct?

m

6m

� aluminium window frames galvanised iron buckets tin-plated iron cans

Corresponding: corrosion prevention method I principle cathodic protection sacrificial protection alloying

A. (l) onlyB. (2) onlyC. (1) and (3) onlyD. (2) and (3) only

17. The diagram below shows the set-up of an experiment :

unglazed porcelain

glass wool with kerosene 「heat

blue litmus solution acidified KMn04(aq)

The unglazed porcelain in tube A is strongly heated and the glass wool is occasionally heated. Which of the following statements is / are correct ?

(I) A chemical reaction occurs at the glass wool.(2) There is NO colour change in the solution in tube B.

(3) There is NO colour change in the solution in tube C.


18. Which of the following statements concerning a hydrogen-oxygen fuel cell is/ are correct?

(1) It produces non-polluting product.(2) The membrane in it selectively allows hydroxide ions to pass through.(3) It can continuously produce electricity as long as hydrogen and oxygen are supplied under

operating conditions.


2012-DSE-CHEM IA-5 8


19. In which of the following processes would a colourless gas evolve?

(1) Magnesium is added to dilute sulphuric acid.(2) Ammonium chloride is heated with calcium hydroxide.(3) Water is added to a solid mixture of citric acid and sodium hydrogencarbonate.

A. (l) and (2) onlyB. (l) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)

20. Which of the following methods can be used to distinguish between ZnClz(aq) and Cal3rz(aq)?

(1) adding N比(aq)(2) performing flame test(3) evaporatmg to dryness

A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)

21. Which of the following compounds can be used as monomers to make addition polymers ?

(1) CF2=CF2 (2) CH2

=C(CH2CH3)CN


22. Which of the following processes involve redox reaction?

(1) 皿xmg methanol and ethanol (2) mixing chlorine and methane under sunlight(3) mixing ethene and acidified KMnOlaq)



(3) VCH2CH3


Directions: Each question below (Questions 23 and 24) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table

A. Both statements are true and the 2nd statement is a correct explanation of the I st statement.B. Both statements are true but the 2nd statement is NOT a correct explanation of the I st statement.C. The 1st statement is false but the 2nd statement is true.D. Both statements are false.

1st statement

23. When iron and copper are separately immersedin hexane completely, iron corrodes faster thancopper.

24. Burning fossil fuels can cause acid rain.

2012-DSE-CHEM IA-7. IO

2nd statement

Iron can be oxidised more readily than copper:

Burning fossil fuels produces carbon dioxide.


PART II

25. What is the theoretical volume of carbon dioxide that can be obtained, at room temperature and pressure,when 1.2 g ofNa2COJ(s) reacts with 50 cm3 of 1.0 M HNO荳

(Molar volume of gas at room temperature and pressure = 24 dm3 ;Relative atomic masses: H = 1.0, C = 12.0, N = 14.0, 0 = 16.0, Na = 23.0)

A. 272 cmB. 544 cmC. 600 cmD. 1200 cm

26. The concentration-time graph for a certain chemical reaction in a closed vessel of fixed volume is shownbelow:

2

I I I

C1

mp yo

w;

I�

，幺r�g)曰

I I丨I I I I I I

／

IJ_l 11 丨 I I I I I I I I

K

lUOJlllJlU:):'.>UO:l

。

／l'J/

I I

'.. , •• 今..L.'. .. [ I I I, , ．．＇：： ---』9:<&1T-!-+-+--+--

20 10 30 40 50 60

time Is

Which of the following chemical equations correctly represents the reaction?

A. P(g)➔ Q(g)B. Q(g)今 P(g)C. P(g)➔ 2Q(g)D. Q(g)➔ 2P(g)



27. In a 1 dm3 closed container, 1 mole of X2(g! undergoes decomposition to form X(g) until equilibrium isattained. The chemical equation concerned 1s shown below :

Xz(g) F 2X(g)

Which of the following graphs correctly shows the variation in concentrations of X2(g) and X(g) with time?

A. B.

這 1.2 X(g) '? 吾

1.2 t X(g)

-目

1.0 ..... 且

1.0 丶 0.8 丶 0.8 ［ d 0 0.6 ＇己0 ＇ 0.6

0.4 0.4 I / Xz(g)

0.2 X2(g) 0.2

。 time Is O' time Is

C. D. 這 1.2 '7

吾1.2

- 1.0。日。.8- 1.0呈0.8 丶X(g) I " 0 ＇ 0.6 丶r:= 0 0.6

0.4 苷./;:l �

0.4 Xz(g) 0.2 i:::

8 0.2

X(g)

Xz(g)

。 time Is 。 time/ s

28. The structure of an organic compound is shown below :

HOPOWhich of the following statements is correct?

A. The compound does NOT show enantiomerism.B. The molecular formula of the compound is C5比04 .C. The compound contains a ketone group.D. The compound can be oxidised by acidified K2Cr20?(aq).



29. Which of the following statements concerning compound U (CH3CH2CH=CHCH2CH20H) is correct?

A. The empirical formula of U is C此0.B. The systematic name ofU is hex-4-en-l-ol. C. U reacts with HCl to give a single product. D. U can separately turn Bri(aq) and acidified KMn04(aq) colourless.

30. Which of the following ions can act as both an oxidising agent and a reducing agent?

A. Fe2+(aq) B. Cu汽aq)C. Cr20汽aq)D. MnO八aq)

31. Which of the following oxides would form an acidic solution when added to water?

A. carbon dioxideB. silicon dioxide C alummmm oxideD. lithium oxide

32. Which of the following structures represent(s) the active ingredient(s) in aspirin tablets?

(I)

O、 /OH&o、r

CH, (2)

A. (1) onlyB. (2) only C. (1) and (3) onlyD. (2) and (3) only

H2N/、rN、,.......-- cooH

。

CHzOH

(3)

33. Which of the following compounds can be formed when (CH邙(OH)Cl-!2CH3 is dehydrated ?

(I) (CH山C=CHCH3

(2) (CH3)2CHCH=CH2

(3) CH2=C(CH3)CH2CH3

A. (I) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)


OH


34. The structure of a compound is shown below :

IH3 H3C一 C-COOH

氬Which of the following statements concerning the compound are correct?

(I) It can form a salt with aqueous ammonia.(2) It can be reduced to an alkanol by using LiAlH4.(3) It can form an ester with methanol under suitable conditions.


Directions: Each question below (Questions 35 and 36) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table :

A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.C. The 1st statement is false but the 2nd statement is true.D. Both statements are false.

1st statement

35. Increasing reaction temperature can increase theyield for all reversible chemical reactions.

36. 2-Chlorobut-1-eneisomerism.

shows geometrical

2nd statement

Increasing reaction temperature can shorten the time needed to attain equilibrium for all reversible chemical reactions.

2-Chlorobut-1-ene has a double bond.

END OF SECTION A

2012-DSE-CHEM IA-II 14


2012-DSE CHEM

B

HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY

HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 2012

CHEMISTRY PAPER 1

SECTION B : Question-Answer Book B

This paper must be answered in English

INSTRUCTIONS FOR SECTION B

(1) After the announcement of the start of theexamination, you should first write your CandidateNumber in the space provided on Page 1 and stickbarcode labels in the spaces provided on Pages 1,3, 5, 7 and 9.

(2) Refer to the general instructions on the cover ofthe Question Paper for Section A.

(3) This section consists of TWO parts, Parts I and II.

(4) Answer ALL questions in both Parts I and II. Writeyour answers in the spaces provided in thisQuestion-Answer Book. Do not write in themargins. Answers written in the margins will notbe marked.

(5) An asterisk (*) has been put next to the questionswhere one mark will be awarded for effectivecommunication.

(6) Supplementary answer sheets will be provided onrequest. Write your candidate number, mark thequestion number box and stick a barcode label oneach sheet, and fasten them with string INSIDEthis Question-Answer Book.

(7) No extra time will be given to candidates forsticking on the barcode labels or filling in thequestion number boxes after the'Time is up'announcement.

Please stick the barcode label here.

!candidate Number! I I I I I I I I

2012-DSE-CHEM IB-1 16 IIJ J II 111111 JIJ 更多試卷歡迎瀏覽 http://dsepp.com

PART I

Answer ALL questions. Write your answers in the spaces provided.

1

Neon occurs naturally in three isotopes with the abundance of each isotope shown in the table below

Isotope Abundance (%) z°Ne 90.48 z1Ne 0.27 22Ne 9.25

(a) What is meant by the term'isotope'?

(I mark) ·p�)(.lll E aq iou IHM sui:�.rn日0m.5ua:ppM sJaMsuy

(b) Calculate the relative atomic mass of neon.

(2 marks)

(c) Give one daily application of neon.

(1 mark)

(d) Explain why the boiling point of neon is lower than that of oxygen.

(2 marks)

·p.i)J.rn曰aqiou IHM sll!i.rn日0m5uaupM SJ.JMSUV

Answers written in the margins will not be marked.

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3. Consider the information concerning the lemon cells shown in the diagrams below

multimeter multimeter

copper strip

(a) ·p.npew

aq iou IHM

SlJ! bl這日al{lll!

uaupM

s1aM.suy

(b)

metal X strip copper strip

What is the function of the lemons in these cells?

叩

metal Y strip

(1 mark)

By completing the table below, arrange metal X, metal Y and copper in increasing order of reducing power.

Reducing power increasing

(1 mark)

(c) For叩, write the half equation for the change that occurs at :

(i) metal X strip (X is a group II metal), and

(ii) copper strip.

(2 marks)

(d)

�

For叩，would the metal Y strip be the positive electrode if the copper strip is replaced with a silver strip ? Explain your answer.

(1 mark)

·p::!)(.It!

E ::iq lOU H!M

Slf! g t?W ::iql lf! u::i:npM

s1::1Msuy


2012-DSE-CHEM lB-4 19 更多試卷歡迎瀏覽 http://dsepp.com

Please stick the barcode丨abel here.

4. With the aid of a diagram, explain the formation of hydrogen bonding in hydrogen fluoride.

·p8

pBUI

;:iq lOU

IT!M.

Slf!i31BUI ;:iqi lf! U;:JU!lM. Sl;:JM.SUV

·p;i)jrem ;iq iou m

,'smE.mm ;;np�u g#F'巳3

t,suv

(3 marks)


2012-DSE-CHEM 18-5 20 更多試卷歡迎瀏覽 http://dsepp.com


Please stick the barcode label here.

*6. Outline the steps in preparing solid lead(II) sulphate from solid lead(II) nitrate. You have to state the

additional chemical reagents that are required, but need NOT mention the apparatus involved. (4 marks)

·p8)j11

ml 8q iou II!M Slf!'a1'1m1 8ql U! U8U!1M S18MSUV

dpX訂戶I

;Jcq lOU W\\ 5 5bl訂日ocIJ日口心UE\\ SJ;).\ ,＇on戶孑

d

Answers written in the margins will not be marked .

.'O 12-DSE-CHEM IB--7 22




8. Potassium hydrogencarbonate (KHC03) can be used to bake bread.into K2C03 , 比0 and CO2.

(a) Explain the purpose ofusing KHC03 in bread baking.

(1 mark)

(b) Write the chemical equation for the decomposition ofKHC03 upon heating.

(I mark)

(c) The enthalpy change of decomposition of KHCOJ(s) can be determined indirectly from the

enthalpy changes of the following two reactions

·p::J){Jl:lUl ::iq lOU H!M Slf! g

l:lUI ::iqi lI! u::iupM SJ::JMSUV

KHCOJ(s) + HCI(aq)--> KCI(aq) + H20(1) + C02(g)

Upon heating, KHC03 decomposes

-------- Reaction (I)

民C03(s) + 2HCl(aq)-> 2KCl(aq) + H20(1) + COi(g) -------- Reaction (2)

In an experiment to determine the enthalpy change of Reaction (1), 3.39 g of KI-ICOJ(s) wasadded to excess HCl(aq) in an expanded polystyrene cup. The experimental data obtained areshown below

Initial temperature of the reacting solution: 25.8 °C

Final temperature of the reacting solution: 20.2 °C

Mass of the resulting solution: 27.5 g

Specific heat capacity of the contents: 4.3 J i i K l

Molar mass ofKHC03 : 100.1 g

(i) Assuming that the heat capacity of the cup used is negligible, calculate the enthalpychange of Reaction (1) from the above data.

·p9 [JUUi�q lOU mM. Slf!2!1UUI�ql If! U�llPM SJ�M.SUV


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9. The diagram below shows an experimental set-up for investigating the factors affecting rusting.

iron nail A iron nail B wrapped with magnesium ribbon

iron nail C sealed with grease

(a) What would be observed if an iron nail in the above set-up rusts ?

gel containing NaCl(aq), K3Fe(CN)6(aq) and phenolphthalein

(1 mark) ·pa)(JUUI aq iou IHM su!'aJuru at[l U! uappM SJ<lMsuy

·p8 (J"BUI eq lOU {HM Slf!l!J"BUI eql lI! UellpM SJeMSUV

(b) Suggest which of the iron nails in the above set-up would NOT rust during the experiment.Explain your answer.

(3 marks)

10. Suggest THREE measures for reducing the emission of air pollutants upon using fossil fuels.

(3 marks)


2012-DSE-CHEM IB-12 27 更多試卷歡迎瀏覽 http://dsepp.com








2 0 1 2 ' D S E , C H E M lB - 2 0

PE

RIO

DIC

TA

BL

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周期

表

GR

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atom

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III

IV

V

VI

VII

4.

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4 5

6 7

8 9

i 10L

i B

e B

C

N

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F

Ne

6.9

9.0

10.8

12

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14.0

16

.0

19.0

i

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1

1

12

relat

ive

atom

ic m

ass

相對

原子

質量

13

14

15

16

17

i 18

N

a M

g A

l Si

p

s

Cl

Ar

23.0

24

.3

27.0

28

.1

31.0

32

.1

35.5

40

.0

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

Sc

Ti

V

Cr

Mn

Fe

Co

Ni

Cu

Zn

Ga

Ge

As

Se

Br

Kr

Ca

39.1

40

.1

45.0

47

.9

50.9

52

.0

54.9

55

.8

58.9

58

.7

63.5

65

.4

69.7

72

.6

74.9

79

.0

79.9

83

.8

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

Rb

Sr

y

Zr

Nb

Mo

Tc

Ru

Rh

P

d A

g C

d In

Sn

S

b T

e I

Xe

85.5

87

.6

88.9

91

.2

92.9

95

.9

(98 )

10

1.1

102.

9 10

6.4

107.

9 11

2.4

114.

8 11

8.7

121.

8 12

7.6

126.

9 13

1.3

55

56

57

*72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

C

s B

a L

a H

f T

a w

R

e O

s Ir

Pt

Au

Hg

Tl

Pb

Bi

Po

At

Rn

132.

9 13

7.3

138.

9 17

8.5

180.

9 18

3.9

186.

2 19

0.2

192.

2 19

5.1

197.

0 20

0.6

204.

4 20

7.2

209.

0 (2

09)

(210

)(2

22)

87

88

89 *

*10

4 10

5 F

r R

a A

c R

f D

b (2

23)

(226

)(2

27)

(261

)(2

62)

＊

＊＊

58

59

60

6 1

62

63

64

65

66

67

68

69

70

71

Ce

Pr

Nd

Pm

Sm

E

u G

d T

b D

y H

o E

r T

m

Yb

Lu

140.

1 14

0.9

144.

2 (1

45)

150.

4 15

2.0

157.

3 15

8.9

162.

5 16

4.9

167.

3 16

8.9

173.

0 17

5.0

90

91

92

93

94

95

96

97

98

99

100

101

102

103

Th

Pa

u

Np

Pu

Am

C

m

Bk

C

f E

s F

m

Md

No

Lr

232.

0 (2

31)

238.

0 (2

37)

(244

) (2

43)

(247

)(2

47)

(251

)(2

52)

(257

)(2

58)

(259

)(2

6 0)


Documents

CHEMISTRY PAPER 1 - DSEPP...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