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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 20.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 0620/31Paper 3 Theory (Core) May/June 2019
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
Cambridge Assessment International EducationCambridge International General Certificate of Secondary Education
This document consists of 18 printed pages and 2 blank pages.
[Turn overIB19 06_0620_31/2RP© UCLES 2019
*7118832773*
This syllabus is regulated for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
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0620/31/M/J/19© UCLES 2019
1 Thediagramsshowpartofthestructuresoffivesubstances,A,B,C,DandE.
Li+ Cl – Li+ Cl –
Cl – Li+ Li+Cl –
Li+ Cl – Li+ Cl –
Cl – Li+ Li+Cl –
Cu Cu Cu Cu
Cu Cu Cu Cu
Cu Cu Cu Cu
Cu Cu Cu Cu
He
HeHe
He
He
He
A B
D E
C
N N
N N
NNN N
NN
(a) Answerthefollowingquestionsaboutthesestructures. Eachstructuremaybeusedonce,morethanonceornotatall.
(i) Which twoofthesestructures,A,B,C,D or E,arecovalentlybonded?
..................................................................and ................................................................... [2]
(ii) Which oneofthesestructures,A,B,C,D or E,isadiatomicmolecule?
....................................................................................................................................... [1]
(iii) Which oneofthesestructures,A,B,C,D or E,isacompound?
....................................................................................................................................... [1]
(iv) Which oneofthesestructures,A,B,C,D or E,isverysolubleinwater? ....................................................................................................................................... [1]
(v) Which oneofthesestructures,A,B,C,D or E,isusedincuttingtools?
....................................................................................................................................... [1]
(vi) Which oneofthesestructures,A,B,C,D or E,isusedinelectricalwiring?
....................................................................................................................................... [1]
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(b) SubstanceBisanelement.
Whatismeantbythetermelement?
....................................................................................................................................................
.............................................................................................................................................. [1]
[Total:8]
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2 Thisquestionisaboutironandironcompounds.
(a) Namethemainoreofiron.
.............................................................................................................................................. [1]
(b) Inablastfurnaceusedfortheextractionofiron,carbonreactswithoxygenfromtheairtoformcarbonmonoxide.
Completethechemicalequationforthisreaction.
....C + ..... 2CO [2]
(c) Inthehotterpartsofthefurnace,carbonreactswiththeiron(III)oxidepresentintheironore.
3C + Fe2O3 3CO + 2Fe
Howdoesthisequationshowthatcarbonisoxidised?
....................................................................................................................................................
.............................................................................................................................................. [1]
(d) Limestoneisaddedtotheblastfurnace.Thelimestoneisconvertedintocalciumoxideandcarbondioxide.Thereactionisendothermic.
heatCaCO3 CaO + CO2
(i) Whattypeofchemicalreactionisthis?
....................................................................................................................................... [1]
(ii) Whattypeofoxideiscalciumoxide? Giveareasonforyouranswer.
.............................................................................................................................................
....................................................................................................................................... [2]
(e) Ironisametal.
Givethreephysicalpropertiesthatarecharacteristicofmetals.
1 .................................................................................................................................................
2 .................................................................................................................................................
3 ................................................................................................................................................. [3]
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(f) Thestructureofacompoundofironisshown.
CO
CO
OC COOC
COOC
COOC FeFe
Deduce themolecular formula of this compound to show the number of iron, carbon andoxygenatoms.
.............................................................................................................................................. [1]
[Total:11]
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3 (a) ThetableshowsthepercentagebymassoftheelementsonEarthandintheUniverse.
element percentagebymassonEarth
percentagebymassintheUniverse
helium 0.0 21.0
hydrogen 0.1 76.0
iron 35.0 1.0
magnesium 14.0 0.1
oxygen 29.0 0.8
silicon 14.0 0.1
sulfur 2.9 0.1
otherelements 0.9
total 100.0 100.0
Answerthesequestionsusingonlytheinformationinthetable.
(i) DeducethepercentagebymassofotherelementspresentonEarth.
.............................. % [1]
(ii) Whichnon-metallicelementispresentonEarthinthegreatestpercentagebymass?
....................................................................................................................................... [1]
(iii) GivetwomajordifferencesinthepercentagebymassoftheelementsonEarthandintheUniverse.
1 ..........................................................................................................................................
.............................................................................................................................................
2 ..........................................................................................................................................
............................................................................................................................................. [2]
(b) Completethediagramtoshowtheelectronarrangementinanoxygenatom.
[1]
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(c) Helium,neonandargonarenoblegases.
(i) Explain,intermsoftheelectronicstructure,whyneonisunreactive.
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) State oneuseofargon.
....................................................................................................................................... [1]
[Total:7]
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4 Thisquestionisaboutiodineandcompoundsofiodine.
(a) Usethekineticparticlemodeltodescribetheseparationbetweenthemoleculesandthetypeofmotionofthemoleculesin:
● solidiodine ..........................................................................................................................
....................................................................................................................................................
● iodinegas. ..........................................................................................................................
.................................................................................................................................................... [4]
(b) Thegraphshowshowthevolumeofiodinegaschangeswithpressure.Thetemperatureiskeptconstant.
volume ofiodine gas
pressure00
Describehowthevolumeofiodinegaschangeswithpressure.
....................................................................................................................................................
.............................................................................................................................................. [1]
(c) (i) Complete thewordequationtoshowthehalogenandhalidecompoundwhichreact toformtheproductsiodineandpotassiumbromide.
........................ + ........................
........................
iodine + potassiumbromide
[2]
(ii) Explain,intermsofthereactivityofthehalogens,whyaqueousiodinedoesnot react with aqueouspotassiumchloride.
.............................................................................................................................................
....................................................................................................................................... [1]
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(d) Iodinereactswithaqueoussodiumthiosulfate,Na2S2O3.
(i) Balancethechemicalequationforthisreaction.
.....Na2S2O3 + I2 Na2S4O6 + .....NaI [2]
(ii) Theenergyleveldiagramforthisreactionisshown.
energy
reactants
products
progress of reaction
Explainhowthisdiagramshowsthatthereactionisexothermic.
.............................................................................................................................................
....................................................................................................................................... [1]
(e) Describeatestforiodideions.
test .............................................................................................................................................
observations .............................................................................................................................. [2]
(f) Moltensodiumiodideiselectrolysed.
Predicttheproductatthepositiveelectrode.
.............................................................................................................................................. [1]
[Total:14]
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5 Coalgasismadebyheatingcoalintheabsenceofair. Thelistshowsthemaingasespresentincoalgas.
carbon dioxidecarbon monoxide
ethenehydrogenmethanenitrogen
(a) (i) Which oneofthesegasesisanalkane?
....................................................................................................................................... [1]
(ii) Drawthestructureofamoleculeofethene.Showalloftheatomsandallofthebonds.
[1]
(iii) Describehowaqueousbrominecanbeusedtotellthedifferencebetweenmethaneandethene.
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [2]
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(b) Ethenemoleculesreactwitheachothertoformpoly(ethene).
(i) Whatisthenamegiventothistypeofchemicalreaction?
....................................................................................................................................... [1]
(ii) Which oneofthefollowingwordsdescribestheethenemoleculesinthisreaction? Drawacirclearoundthecorrectanswer.
elements mixtures monomers polymers [1]
(iii) Poly(ethene)isanon-biodegradableplastic.
Whatismeantbythetermnon-biodegradable?
.............................................................................................................................................
....................................................................................................................................... [1]
(iv) Describeonepollutionproblemcausedbynon-biodegradableplastics.
.............................................................................................................................................
....................................................................................................................................... [1]
(c) Ethanolcanbemadefrometheneandoneotherreactant.
● Nametheotherreactant.
....................................................................................................................................................
● Statetheconditionsneededtomakeethanolfromethene.
....................................................................................................................................................
.................................................................................................................................................... [3]
[Total:11]
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6 Thisquestionisaboutcopperandcoppercompounds.
(a) Describehowyoucouldprepareapuresampleofcrystalsofhydratedcopper(II)sulfateusingdilutesulfuricacidandanexcessofcopper(II)oxide.
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
.............................................................................................................................................. [3]
(b) Anhydrouscopper(II)sulfateisusedtotestforwater.
CuSO4 + 5H2O CuSO4.5H2O anhydrous hydrated copper(II)sulfate copper(II)sulfate
(i) Whatismeantbythesymbol ?
....................................................................................................................................... [1]
(ii) Howcanhydratedcopper(II)sulfatebechangedintoanhydrouscopper(II)sulfate?
....................................................................................................................................... [1]
(c) Complete the table to calculate the relative formulamass of anhydrous copper(II) sulfate,CuSO4.
UseyourPeriodicTabletohelpyou.
type of atom numberof atoms
relativeatomic mass
copper 1 64 1 × 64 = 64
sulfur
oxygen
relativeformulamass=............................... [2]
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(d) Completethetabletoshowthenumberofelectrons,protonsandneutronsinthesulfuratomandcopperionshown.
numberofelectrons
numberofneutrons
numberofprotons
34S16
63Cu2+29 29
[4]
(e) Alloysofcopperareusedtomakecoins.
(i) Whatismeantbythetermalloy?
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Suggestwhyanalloyofcopperisusedtomakecoinsinsteadofusingpurecopper.
....................................................................................................................................... [1]
[Total:13]
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7 Astudentinvestigatestherateofreactionofsmallpiecesofcalciumcarbonatewithanexcessofhydrochloricacidofconcentration1mol/dm3.
CaCO3(s)+2HCl(aq) CaCl 2(aq)+CO2(g)+H2O(l)
(a) Namethesaltformedwhencalciumcarbonatereactswithhydrochloricacid.
.............................................................................................................................................. [1]
(b) Thegraphshowshowthemassofthereactionmixturechangeswithtime.
200.0
199.8
199.6
199.4
199.2
199.0
198.80 20 40 60
time / s
80 100 120 140
mass ofreactionmixture/ g
(i) Statewhythereactionmixturedecreasesinmass.
....................................................................................................................................... [1]
(ii) Calculatethelossinmassduringthefirst40secondsoftheexperiment.
.............................. g [1]
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(iii) Theexperimentisrepeatedusinghydrochloricacidofconcentration2mol/dm3. Allotherconditionsarekeptthesame.
Draw a line on the grid for the experiment using hydrochloric acid of concentration2mol/dm3. [2]
(iv) In the experiment,when 2.00g of calcium carbonate is used, the loss inmass of thereactionmixtureis0.88g.
Allotherconditionsarekeptthesame.
Calculatethelossinmasswhen0.50gofcalciumcarbonateisused.
lossinmass=..............................g[1]
(v) The experiment is repeated using the same mass of different sized pieces ofcalciumcarbonate.
Allotherconditionsarekeptthesame.
Thesizesofthepiecesofcalciumcarbonateare:
● powder ● smallpieces ● largepieces.
Complete the table bywriting the sizesof thepiecesof calciumcarbonate in the firstcolumn.
sizeofpiecesofcalciumcarbonate
initialrateoflossinmassing/s
0.005
0.030
0.100
[1]
[Total:7]
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8 (a) Sulfurdioxideisapollutantintheair.
(i) State onesourceofsulfurdioxideintheair.
....................................................................................................................................... [1]
(ii) Sulfurdioxideisoxidisedtosulfurtrioxideintheair. Oxidesofnitrogenactascatalystsforthisreaction.
Whatismeantbythetermcatalyst?
.............................................................................................................................................
....................................................................................................................................... [1]
(iii) Sulfurtrioxidedissolvesinrainwatertoformacidrain.
Which oneofthefollowingpHvaluescouldbethepHofacidrain? Drawacirclearoundthecorrectanswer.
pH 4 pH 7 pH 9 pH 13 [1]
(iv) State oneadverseeffectofacidrainonbuildings.
....................................................................................................................................... [1]
(b) Sulfurdioxidemeltsat–73°Candboilsat–10°C.
Whatisthephysicalstateofsulfurdioxideat–20°C? Explainyouranswer.
....................................................................................................................................................
.............................................................................................................................................. [2]
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(c) Excesssulfuricacidreactswithammoniatomakeasaltwhichcanbeusedasafertiliser.
Statethenameofthesaltformedwhenexcesssulfuricacidreactswithammonia.
.............................................................................................................................................. [1]
(d) Thetableshowssomeobservationsaboutthereactivityoffourmetalswithdilutesulfuricacid.
metal reactionwithsulfuricacid
iron aslowstreamofbubblesisseen
magnesium arapidstreamofbubblesisseen
nickel afewbubblesslowlyform
tungsten nobubblesareseen
Usetheinformationinthetabletoputthefourmetalsinorderoftheirreactivity. Puttheleastreactivemetalfirst.
least reactive most reactive
[2]
[Total:9]
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BLANK PAGE
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BLANK PAGE
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 Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series.
Cambridge Assessment International Education is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge.
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0620/31/M/J/19© UCLES 2019
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
–