Cambridge International Examinations Cambridge ... (0620)/0620_w18_q… · READ THESE INSTRUCTIONS...

16
READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fuid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. A copy of the Periodic Table is printed on page 16. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. CHEMISTRY 0620/42 Paper 4 Theory (Extended) October/November 2018 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. Cambridge International Examinations Cambridge International General Certifcate of Secondary Education This document consists of 13 printed pages and 3 blank pages. [Turn over IB18 11_0620_42/3RP © UCLES 2018 *4401701629* The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certifcate.

Transcript of Cambridge International Examinations Cambridge ... (0620)/0620_w18_q… · READ THESE INSTRUCTIONS...

Page 1: Cambridge International Examinations Cambridge ... (0620)/0620_w18_q… · READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.

Write in dark blue or black pen.

You may use an HB pencil for any diagrams or graphs.

Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

Answer all questions.

Electronic calculators may be used.

A copy of the Periodic Table is printed on page 16.

You may lose marks if you do not show your working or if you do not use appropriate units.

At the end of the examination, fasten all your work securely together.

The number of marks is given in brackets [ ] at the end of each question or part question.

CHEMISTRY 0620/42

Paper 4 Theory (Extended) October/November 2018

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

Cambridge International Examinations

Cambridge International General Certificate of Secondary Education

This document consists of 13 printed pages and 3 blank pages.

[Turn overIB18 11_0620_42/3RP

© UCLES 2018

*4401701629*

The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.

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2

0620/42/O/N/18© UCLES 2018

1 Element X can undergo the following physical changes.

gaseous Xboiling or

evaporation

liquid X

solid X

2

4

3

1

(a) (i) Givethescientificnameforeachofthenumberedphysicalchanges.

1 ..........................................................................................................................................

2 ..........................................................................................................................................

3 ..........................................................................................................................................

4 .......................................................................................................................................... [4]

(ii) Explain why the changes shown are physical changes.

.............................................................................................................................................

....................................................................................................................................... [1]

(iii) Onedifferencebetweenboilingandevaporationistherateatwhichtheprocessesoccur.

State oneotherdifferencebetweenboilingandevaporation.

.............................................................................................................................................

....................................................................................................................................... [1]

(b) Describetheseparation,arrangementandmotionofparticlesofelementX in the solid state.

separation ..................................................................................................................................

arrangement ..............................................................................................................................

motion ........................................................................................................................................ [3]

(c) Element XisaGroupImetal.ItburnsinairtoformanoxideX2O.

Write a chemical equation for this reaction.

.............................................................................................................................................. [2]

[Total: 11]

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2 Magnesium,calciumandstrontiumareGroupIIelements.

(a) Completethetabletoshowthearrangementofelectronsinacalciumatom.

shellnumber 1 2 3 4

numberofelectrons

[1]

(b) Describehowthearrangementofelectronsinastrontiumatomis:

(i) similar to the arrangement of electrons in a calcium atom

.............................................................................................................................................

.............................................................................................................................................

(ii) different from the arrangement of electrons in a calcium atom.

.............................................................................................................................................

.............................................................................................................................................

[2]

(c) Calcium reacts with cold water to form two products:

● acolourlessgas,P,which‘pops’withalightedsplint ● aweaklyalkalinesolution,Q,whichturnsmilkywhencarbondioxideisbubbledthroughit.

(i) Name gas P.

....................................................................................................................................... [1]

(ii) IdentifytheionresponsibleformakingsolutionQ alkaline.

....................................................................................................................................... [1]

(iii) Suggest the pH of solution Q.

....................................................................................................................................... [1]

(iv) Write a chemical equation for the reaction of calcium with cold water.

....................................................................................................................................... [2]

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(d) Magnesiumreactswithchlorinetoformmagnesiumchloride,MgCl 2. Magnesium chloride is

an ionic compound.

(i) Complete the diagrams to show the electronic structures of the ions in magnesium chloride.

Show the charges on the ions.

Cl

......

Mg

......

Cl

......

[3]

(ii) Give three physical properties that are typical of ionic compounds such as MgCl 2.

1 ..........................................................................................................................................

2 ..........................................................................................................................................

3 ..........................................................................................................................................

[3]

(e) Aqueous magnesium chloride is added to aqueous silver nitrate. A white precipitate forms.

Write an ionicequationforthisreaction.Includestatesymbols.

.............................................................................................................................................. [2]

[Total: 16]

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3 Sulfur is an important element.

(a) Explainhowburningfossilfuelscontainingsulfurleadstotheformationofacidrain.

....................................................................................................................................................

....................................................................................................................................................

.............................................................................................................................................. [2]

(b) SulfuricacidismanufacturedbytheContactprocess.OnestepintheContactprocessinvolvesareversiblereactioninwhichsulfurtrioxide,SO3,isformed.

(i) Writeachemicalequationforthisreversiblereaction.Includethecorrectsymboltoshowthatthereactionisreversible.

....................................................................................................................................... [2]

(ii) Statetheconditionsandnamethecatalystusedinthisreversiblereaction.

temperature ........................................................................................................................

pressure ..............................................................................................................................

catalyst ...............................................................................................................................

[3]

(iii) Describehowthesulfurtrioxideformedisconvertedintosulfuricacidinthenextstepsofthe Contact process.

.............................................................................................................................................

.............................................................................................................................................

....................................................................................................................................... [2]

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(c) Dilute sulfuric acid is used to make salts known as sulfates.

Amethodconsistingofthreestepsisusedtomakezincsulfatefromzinccarbonate.

step 1 Addanexcessofzinccarbonateto20cm3of0.4mol/dm3 dilute sulfuric acid until

the reaction is complete.

step 2 Filter the mixture.

step 3 Heatthefiltrateuntilasaturatedsolutionformsandthenallowittocrystallise.

(i) Nameasuitablepieceofapparatusformeasuring20cm3 of dilute sulfuric acid in step 1.

....................................................................................................................................... [1]

(ii) State twoobservationswhichwouldshowthatthereactioniscompleteinstep 1.

1 ..........................................................................................................................................

2 ..........................................................................................................................................

[2]

(iii) Whyisitimportanttoaddanexcessofzinccarbonateinstep 1?

....................................................................................................................................... [1]

(iv) Whatismeantbythetermsaturated solution in step 3?

.............................................................................................................................................

....................................................................................................................................... [2]

(v) The equation for the reaction is shown.

ZnCO3(s) + H2SO4(aq) ZnSO4(......) + H2O(l) + CO2(g)

Completetheequationbyinsertingthestatesymbolforzincsulfate. [1]

(vi) Name another zinc compound which could be used to make zinc sulfate from dilutesulfuric acid using this method.

....................................................................................................................................... [1]

(vii) Suggest why this method would notworktomakebariumsulfatefrombariumcarbonateand dilute sulfuric acid.

....................................................................................................................................... [1]

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(d) In a titration, a student added 25.0cm3 of 0.200mol/dm3 aqueous sodium hydroxide to a

conical flask.The student thenaddeda fewdrops ofmethyl orange to the solution in theconicalflask.

Dilutesulfuricacidwasthenaddedfromaburettetotheconicalflask.Thevolumeofdilutesulfuricacidneededtoneutralisetheaqueoussodiumhydroxidewas20.0cm3.

2NaOH + H2SO4 Na2SO4 + 2H2O

(i) What was the colour of the methyl orange in the aqueous sodium hydroxide?

....................................................................................................................................... [1]

(ii) Determinetheconcentrationofthedilutesulfuricaciding/dm3.

● Calculate thenumberofmolesofaqueoussodiumhydroxideaddedto theconicalflask.

.............................. mol

● Calculatethenumberofmolesofdilutesulfuricacidaddedfromtheburette.

.............................. mol

● Calculatetheconcentrationofthedilutesulfuricacidinmol/dm3.

..............................mol/dm3

● Calculatetheconcentrationofthedilutesulfuricaciding/dm3.

..............................g/dm3

[4]

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(e) Iron(II) sulfate decomposes when heated strongly.

2FeSO4(s) Fe2O3(s) + SO2(g) + SO3(g)

15.20gofFeSO4(s)washeatedandformed4.80gofFe2O3(s).

[Mr,FeSO4=152;Mr,Fe2O3=160]

Calculate the percentage yield for this reaction.

.............................. % [3]

[Total: 26]

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4 Astudentinvestigatedtheprogressofthereactionbetweendilutehydrochloricacid,HCl,andanexcessoflargepiecesofmarble,CaCO3,usingtheapparatusshown.

gas syringe

dilute

hydrochloric acid an excess of large

pieces of marble

(a) A graph of the volume of gas produced against time is shown.

150

100

50

0

volume of gas

produced / cm3

0 30 60 90 120

time / s

150 180 210 240

(i) How does the shape of the graph show that the rate of reaction decreased as the reaction

progressed?

.............................................................................................................................................

....................................................................................................................................... [1]

(ii) Why did the rate of reaction decrease as the reaction progressed?

....................................................................................................................................... [1]

(iii) Afterhowmanysecondsdidthereactionfinish?

.............................. s [1]

(b) Theexperimentwas repeatedusing the samemassof smaller piecesofmarble.All otherconditions were kept the same.

Draw a graph on the grid to show the progress of the reaction using the smaller pieces of

marble. [2]

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(c) The original experiment was repeated at a higher temperature. All other conditions were kept

the same.

Describeandexplain, in termsof collisionsbetweenparticles, theeffect of usingahighertemperatureonthetimetakenforthereactiontofinish.

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

..............................................................................................................................................[5]

[Total:10]

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0620/42/O/N/18© UCLES 2018 [Turn over

5 Alkynesareahomologousseriesofunsaturatedhydrocarbons. AllmemberscontainaC≡Ctriplebond.

(a) Completethetableshowinginformationaboutthefirstthree alkynes.

formula C2H2 C3H4

structure H–C≡C–H H–C≡C–CH3 H–C≡C–CH2–CH3

name ethyne butyne

[2]

(b) Completethedot-and-crossdiagramtoshowtheelectronarrangementinamoleculeofethyne, H–C≡C–H.Showoutershellelectronsonly.

H HC C

[2]

(c) Compounds in the same homologous series have the same general formula.

(i) Give twoothercharacteristicsofmembersofahomologousseries.

1 ..........................................................................................................................................

2 ..........................................................................................................................................

[2]

(ii) Usetheinformationinthetablein(a) to deduce the general formula of alkynes.

....................................................................................................................................... [1]

(d) Alkynes are unsaturated.

Describeatestforunsaturation.

test .............................................................................................................................................

result ..........................................................................................................................................

[2]

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(e) (i) Nameanoxidisingagentwhichcanbeusedtooxidiseethanoltoethanoicacid.

....................................................................................................................................... [2]

(ii) Drawthestructureofethanoicacid.Showalloftheatomsandallofthebonds.

[1]

(f) Carboxylicacidscanbeconvertedintoesters.

(i) Theester formedby reactingpropanoicacidandmethanol has themolecular formulaC4H8O2.

Namethisesteranddrawitsstructure.Showalloftheatomsandallofthebonds.

name of the ester ................................................................................................................

structure of the ester

[2]

(ii) Name another ester with the molecular formula C4H8O2.

....................................................................................................................................... [1]

(g) Polyesters are polymers.

(i) What type of polymerisation is used in the manufacture of polyesters?

....................................................................................................................................... [1]

(ii) Name a polyester.

....................................................................................................................................... [1]

[Total: 17]

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Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable

effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will

be pleased to make amends at the earliest possible opportunity.

To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International

Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after

the live examination series.

Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local

Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

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16

0620/42/O/N/18© UCLES 2018

Gro

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1

2

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VI

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lith

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ca

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rub

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85

38

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str

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88

55

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ca

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56

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ba

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87

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fra

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m

88

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rad

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11

13

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alu

min

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27

31

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gallium

70

49

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indium

115

81 Tl

thallium

204

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12

14 Si

silicon

28

32

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germanium

73

50

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119

82

Pb

lead

207

22 Ti

titanium

48

40

Zr

zirconium

91

72

Hf

hafnium

178

104

Rf

rutherfordium

23 V

vanadium

51

41

Nb

niobium

93

73

Ta

tantalum

181

105

Db

dubnium

24

Cr

chromium

52

42

Mo

molybdenum

96

74

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184

106

Sg

seaborgium

25

Mn

manganese

55

43

Tc

technetium

– 75

Re

rhenium

186

107

Bh

bohrium

26

Fe

iron

56

44

Ru

ruthenium

101

76

Os

osmium

190

108

Hs

hassium

27

Co

cobalt

59

45

Rh

rhodium

103

77

Ir

iridium

192

109

Mt

meitnerium

28

Ni

nickel

59

46

Pd

palladium

106

78

Pt

platinum

195

110

Ds

darmstadtium

29

Cu

copper

64

47

Ag

silver

108

79

Au

gold

197

111

Rg

roentgenium

30

Zn

zinc

65

48

Cd

cadmium

112

80

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mercury

201

112

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copernicium

114

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flerovium

116

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livermorium

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14

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phosphorus

31

33

As

arsenic

75

51

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antimony

122

83 Bi

bismuth

209

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16

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sulfur

32

34

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selenium

79

52

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tellurium

128

84

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po

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19

17

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ch

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35

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140

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thorium

232

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praseodymium

141

91

Pa

protactinium

231

60

Nd

neodymium

144

92 U

uranium

238

61

Pm

promethium

– 93

Np

neptunium

62

Sm

samarium

150

94

Pu

plutonium

63

Eu

europium

152

95

Am

americium

64

Gd

gadolinium

157

96

Cm

curium

65

Tb

terbium

159

97

Bk

berkelium

66

Dy

dysprosium

163

98

Cf

californium

67

Ho

holmium

165

99

Es

einsteinium

68

Er

erbium

167

100

Fm

fermium

69

Tm

thulium

169

101

Md

mendelevium

70

Yb

ytterbium

173

102

No

nobelium

71

Lu

lutetium

175

103

Lr

lawrencium