of 16 /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 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 0620/33 Paper 3 Theory (Core) May/June 2017 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 16 printed pages. [Turn over IB17 06_0620_33/3RP © UCLES 2017 *6485603039* 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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Page 1: (GXFDWLRQ CHEMISTRY 0620/33 - · PDF file... Suggest a practical method for investigating the rate of this ... methanoic acid 1 8 101 1.220 ethanoic acid 2 ... increasing the concentration

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 0620/33

Paper 3 Theory (Core) May/June 2017

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

Cambridge International ExaminationsCambridge International General Certificate of Secondary Education

This document consists of 16 printed pages.

[Turn overIB17 06_0620_33/3RP© UCLES 2017

*6485603039*

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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1 (a) Theelectronicstructuresoffiveatoms,A,B,C,DandE,areshown.

A B C D E

Answerthefollowingquestionsabouttheseatoms. Eachatommaybeusedonce,morethanonceornotatall.

Whichatom,A,B,C,D or E,

(i) isinGroupVIIIofthePeriodicTable, ..............................[1]

(ii) isachlorineatom, ..............................[1]

(iii) has17protonsinitsnucleus, ..............................[1]

(iv) isanatomofanelementinthesameperiodascarbon, ..............................[1]

(v) isanatomofametal? ..............................[1]

(b) Completethetabletoshowthenumberofelectrons,neutronsandprotonsinthemagnesiumatomandcalciumionshown.

numberofelectrons numberofneutrons numberofprotons

26Mg12 12

44Ca2+20 24

[3]

[Total:8]

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2 (a) Thetableshowstheionspresentina1000cm3sampleofmineralwater.

ion present formulaofion masspresentinmg/1000cm3

calcium Ca2+ 52

chloride Cl – 10

hydrogencarbonate HCO3– 50

magnesium Mg2+

sodium Na+ 12

sulfate SO42– 10

NO3– 8

total 150

Answerthesequestionsusingtheinformationfromthetable.

(i) Calculatethemassofmagnesiumionsinthe1000cm3sampleofmineralwater.

massofmagnesiumions=..............................mg[1]

(ii) Whichnegativeionispresentinthehighestconcentration?

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

(iii) StatethenameoftheionNO3–.

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

(iv) Calculatethemassofhydrogencarbonateionspresentin250cm3ofthissample.

massofhydrogencarbonateions=..............................mg[1]

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(b) Whennitrateionsarewarmedwithaqueoussodiumhydroxideandaluminiumfoil,ammoniagasisgivenoff.

Describeatestforammoniagas.

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

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

(c) Theformulaeofsomebromidesaregiven.

aluminiumbromide,Al Br3 magnesiumbromide,MgBr2 sodiumbromide,NaBr

Deducetheformulaforcalciumbromide.

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

(d) Moltencalciumbromidecanbeelectrolysedusinginertelectrodes.

(i) Predicttheproductsofthiselectrolysisat

thenegativeelectrode(cathode),.......................................................................................

thepositiveelectrode(anode)............................................................................................[2]

(ii) Graphiteelectrodesareinert.

Givethenameofoneothersubstancethatcanbeusedtomakeaninertelectrode.

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

[Total:10]

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3 Thediagramshowspartofthestructuresofthreesubstances,P,QandR,atroomtemperatureandpressure.

K+I–K+

K+

I–

K+ K+I–I–

K+I– I–

P Q R

Br Br

BrBr Br Br

Br BrBr Br

Br Br

Br BrAr

Ar ArAr

Ar

ArAr

Ar Ar

(a) DescribesubstancesP,QandRintermsof

● theirbonding, ● thearrangementoftheirparticles, ● themotionoftheirparticles.

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

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

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

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

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

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

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

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

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

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0620/33/M/J/17© UCLES 2017

(b) AclosedgassyringecontainssubstanceR.Thesyringeisheatedinawaterbath.

R

end blocked

water bath

gas syringe

heat

DescribewhathappenstothevolumeofsubstanceR inthesyringe.Thepressureremainsconstant.Explainyouranswerintermsofparticles.

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

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

(c) SubstancePundergoesphysicalandchemicalchanges.

Which twoofthefollowingarephysicalchanges?Explainyouranswer.

A SubstancePreactswithconcentratedsulfuricacid.

B IodineformswhenchlorineisaddedtoanaqueoussolutionofsubstanceP.

C SubstancePboilsat1330°C.

D SubstancePdissolveseasilyinwater.

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

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

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

(d) Graphitehasagiantcovalentstructurecontaininglayersofcarbonatoms. Graphiteisusedtomakeinertelectrodesforelectrolysis.

Stateoneotheruseofgraphiteandexplainhowthisuseisrelatedtoitsstructure.

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

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

[Total:12]

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4 Ironisextractedfromitsorebyheatingtheorewithcarboninablastfurnace.

(a) (i) Statethenameofanoreofiron.

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

(ii) Intheblastfurnace,iron(III)oxideisreducedbycarbonmonoxide.

Explainhowthecarbonmonoxideisformedintheblastfurnace.

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

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

(iii) Balancethechemicalequationforthisreaction.

Fe2O3+3CO ......Fe+......CO2[2]

(iv) Howdoesthisequationshowthatiron(III)oxideisreduced?

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

(v) Calculatetherelativeformulamassofiron(III)oxide,Fe2O3. Showallyourworking. UseyourPeriodicTabletohelpyou.

relativeformulamass=..............................[2]

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(b) Ironreactswithhydrochloricacidtoformiron(II)chlorideandagaswhich‘pops’withalightedsplint.

(i) Identifythisgas.

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

(ii) Suggestapracticalmethodforinvestigatingtherateofthisreactioninvolvingcollectionofthegas.

Youmayincludealabelleddiagraminyouranswer.

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

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

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

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

(c) Describeatestforiron(II)ions.

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

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

(d) Givetwoadvantagesofrecyclingsteel.

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

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

[Total:16]

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5 Glycolicacidisfoundinthestalksofsugar-caneplants.

Thestructureofglycolicacidisshown.

H

C C

O

O

HO

H

H

(a) Onthestructureshowndrawacirclearoundthecarboxylicacidfunctionalgroup. [1]

(b) Give themolecular formula of glycolic acid showing the number of carbon, hydrogen andoxygenatoms.

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

(c) Suggesthowyoucouldobtainasolutioncontainingglycolicacidfromsugar-caneplants.

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

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

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

(d) Nitricacidcanoxidiseglycolicacid.

Whatisthemeaningofthetermoxidation?

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

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(e) Thetableshowsthepropertiesofsomecarboxylicacids.

carboxylicacidnumberof

carbonatomsinonemolecule

meltingpointin °C

boilingpointin °C

densitying/cm3

methanoicacid 1 8 101 1.220

ethanoicacid 2 17 118 1.049

propanoicacid 3 –21 0.993

butanoicacid 4 –5 164 0.958

(i) Describehowthedensityofthecarboxylicacidsvarieswiththenumberofcarbonatomsinonemolecule.

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

(ii) Predicttheboilingpointofpropanoicacid.

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

(iii) Whatisthestateofbutanoicacidat–10°C?Explainyouranswer.

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

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

[Total:10]

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6 (a) Thetableshowsthepropertiesofsomealloys.

alloy densitying/cm3

relativehardness

relativestrength

relativeelectrical

conductivitycost

J 7.8 4.0 24.0 1.1 cheap

K 2.8 2.5 7.5 3.8 expensive

L 11.3 0.2 1.5 0.5 cheap

M 10.2 5.5 16.5 0.2 veryexpensive

Usetheinformationinthetabletoanswerthequestions.

(i) Whichalloywouldbemostusefulformakingabridge? Givetworeasonsforyouranswer.

alloy.................

reason1..............................................................................................................................

reason2..............................................................................................................................[2]

(ii) Whichalloyisbesttomakethetipsofhigh-speeddrills? Giveonereasonforyouranswer.

alloy.................

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

(iii) Whichalloyisbesttomakeaircraftbodies? Giveonereasonforyouranswer.

alloy.................

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

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(b) Astudenttookpiecesoffourdifferentsteelalloys,W,X,YandZ,eachofthesamemass,andplacedthemseparatelyintohydrochloricacid.Theconcentrationofacidwasthesameineachcaseandthemetalwasinexcess.Allotherconditionswerekeptthesame.

The studentmeasured themass of each alloy at intervals as the reaction proceeded andcalculatedthepercentagemassloss.

TheresultsforalloysW,XandYareshownonthegraph.

100

80

60

40

20

00 1 2 3 4

time / days5 6 7

percentagemass loss

W

X

Y

(i) AlloyZreactsfasterwithhydrochloricacidthanalloyW.

Onthegraph,drawalinewhichcouldrepresentthepercentagemasslossofalloyZwithtime.

[2]

(ii) Whichalloyshowedtheleastpercentagemasslossafter3days?

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

(iii) HowlongdidittakeforalloyXtolose40%ofitsmass?

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

(iv) Suggesthowthefollowingfactorsaffecttherateofmassloss.

increasingthetemperature.................................................................................................

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

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(c) Theconcentrationofanacidcanbefoundbytitratingitwithaqueoussodiumhydroxide.

SuggestwhichoneofthesepHvaluesisthepHofconcentratedaqueoussodiumhydroxide. Drawacirclearoundthecorrectanswer.

pH1pH3pH7pH12[1]

[Total:11]

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7 Waterisasimplecovalentcompound.

(a) Completethediagramtoshowtheelectronsinthecovalentbondsinawatermolecule.

O

HH

[1]

(b) Give two physical propertieswhich distinguish a simple covalent compound froman ioniccompound.

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

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

(c) Someinformationaboutthereactionoffourmetalswithwaterisgiven.

cerium: reactsslowlywithcoldwater

iron: reactswithsteamonlywhenextremelyhot

lithium: reactsrapidlywithcoldwater

magnesium: reactsslowlywithhotwater

Listthesemetalsinorderoftheirreactivity.Puttheleastreactivemetalfirst.

least reactive most reactive

[2]

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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.

(d) (i) Statetheconditionsneededforirontorust.

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

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

(ii) Statetwomethodsofrustprevention.

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

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

(e) Startingwithanaqueoussolutionofcopper(II)sulfate,describehowyoucouldobtainapuredrysampleofcopper(II)sulfatecrystals.

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

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

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

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

(f) Carbondioxideandwaterareformedwhenhydrocarbonsburn.

Completethechemicalequationforthecombustionofbutene.

C4H8+6O2 ......CO2+......H2O[2]

[Total:13]

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Gro

up

The

Perio

dic

Tabl

e of

Ele

men

ts

1 Hhy

drog

en1

2 He

heliu

m4

III

IIIIV

VV

IV

IIV

III

3 Lilit

hium 7

4 Be

bery

llium

9

atom

ic n

umbe

r

atom

ic s

ymbo

l

Key

nam

ere

lativ

e at

omic

mas

s

11 Na

sodi

um23

12 Mg

mag

nesi

um24

19 Kpo

tass

ium

39

20 Ca

calc

ium

40

37 Rb

rubi

dium

85

38 Sr

stro

ntiu

m88

55 Cs

caes

ium

133

56 Ba

bariu

m13

7

87 Frfra

nciu

m–

88 Ra

radi

um –

5 B boro

n11 13 Al

alum

iniu

m27 31 Ga

gallium70 49 In indium

115

81 Tlthallium

204

6 Ccarbon

12 14 Si

silicon

28 32 Ge

germanium

73 50 Sn tin 119

82 Pb

lead207

22 Tititanium

48 40 Zrzirconium

91 72 Hf

hafnium

178

104

Rf

rutherfordium

23 Vvanadium

51 41 Nb

niobium

93 73 Tatantalum

181

105

Db

dubnium

24 Cr

chromium

52 42 Mo

molybdenum

96 74 Wtungsten

184

106

Sg

seaborgium

25 Mn

manganese

55 43 Tctechnetium

– 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 Iriridium

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 Hg

mercury

201

112

Cn

copernicium

114 Fl

flerovium

116

Lvlivermorium

7 Nnitrogen

14 15 Pphosphorus

31 33 As

arsenic

75 51 Sb

antimony

122

83 Bi

bismuth

209

8 Ooxygen

16 16 S sulfur

32 34 Se

selenium

79 52 Tetellurium

128

84 Po

polo

nium

9 Fflu

orin

e19 17 Cl

chlo

rine

35.5

35 Br

brom

ine

80 53 Iio

dine

127

85 At

asta

tine

10 Ne

neon 20 18 Ar

argo

n40 36 Kr

kryp

ton

84 54 Xe

xeno

n13

1

86 Rn

rado

n–

21 Sc

scan

dium

45 39 Yyt

trium 89

57–7

1la

ntha

noid

s

89–1

03ac

tinoi

ds

57 Lala

ntha

num

139

89 Ac

lant

hano

ids

actin

oids

The

volu

me

of o

ne m

ole

of a

ny g

as is

24

dm3 a

t roo

m te

mpe

ratu

re a

nd p

ress

ure

(r.t.p

.).

actin

ium

58 Ce

ceriu

m140

90 Th thorium

232

59 Pr

praseodymium

141

91 Pa

protactinium

231

60 Nd

neodymium

144

92 Uuranium

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