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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 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 0620/32
Paper 3 Theory (Core) February/March 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 16 printed pages.
[Turn overIB18 03_0620_32/2RP
© UCLES 2018
*6572782506*
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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0620/32/F/M/18© UCLES 2018
1 (a) Thestructuresoffivesubstances,A,B,C,DandE,areshown.
Na+Br –Na+
Na+
Br –
Na+ Na+Br – HBr –
Na+Br – Br –
A B
CC
H
H
C D
OC
Cl
Cl
Cl
IO
E
OO
Br
H
Br
Answerthefollowingquestionsusingonlythesubstancesinthediagram. Eachsubstancemaybeusedonce,morethanonceornotatall.
Statewhichsubstance,A,B,C,D or E:
(i) isadiatomicmolecule.................................................................................................. [1]
(ii) containsbromideions................................................................................................... [1]
(iii) isanelement................................................................................................................ [1]
(iv) isagaswhichisaproductofrespiration...................................................................... [1]
(v) givesayellowcolourinaflametest............................................................................. [1]
(b) Anisotopeofoxygenisrepresentedbythesymbolshown.
17O8
Deducethenumberofprotons,neutronsandelectronsinthisisotopeofoxygen.
numberofprotons.....................................................................................................................
numberofneutrons...................................................................................................................
numberofelectrons................................................................................................................... [3]
(c) Describeatestforoxygen.
test .............................................................................................................................................
result.......................................................................................................................................... [2]
[Total:10]
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2 (a) Thetableshowsthemassofeachtypeofionpresentina100cm3sampleofmilk.
nameofion formulaofion massofionpresentin100cm3milk/mg
calcium Ca2+ 125
chloride Cl – 120
Mg2+ 12
phosphate PO43– 95
potassium K+ 140
sodium Na+ 58
SO42– 30
negativeionsoforganicacids 160
(i) Calculatethemassofcalciumionspresentina20cm3sampleofthismilk.
massofcalciumions=..............................mg[1]
(ii) Whichpositiveionispresentinthehighestconcentrationinthissampleofmilk?
....................................................................................................................................... [1]
(iii) NamethecompoundformedfromMg2+andSO42–ions.
....................................................................................................................................... [1]
(iv) Describeatestforchlorideions.
test ......................................................................................................................................
.............................................................................................................................................
result................................................................................................................................... [3]
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(b) Oneoftheorganicacidspresentinmilkislacticacid. Thestructureoflacticacidisshown.
C C
O
O H
O
H
C
H
H
H
H
(i) Onthestructureshowndrawacirclearoundthecarboxylicacidfunctionalgroup. [1]
(ii) Deducethemolecularformulaoflacticacidshowingthenumberofcarbon,hydrogenandoxygenatoms.
....................................................................................................................................... [1]
(c) Ethanoicacidisanotherorganicacid.
(i) Thereductionofethanoicacidproducesethanol.
Whatismeantbythetermreduction?
....................................................................................................................................... [1]
(ii) ThemolecularformulaofethanolisC2H6O.
Completethetabletocalculatetherelativemolecularmassofethanol.
numberofatoms relativeatomicmass
carbon 2 12 2 ×12=24
hydrogen
oxygen
relativemolecularmass=..............................[2]
[Total:11]
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3 Thisquestionisabouthalogens.
(a) Acrystalofiodinewasplacedatthebottomofabeakercontainingthesolventcyclohexane. After2days,apurplecolourhadspreadthroughoutthecyclohexane.
at the start after 2 hours after 2 days
cyclohexane
crystal of iodine
Explaintheseobservationsusingthekineticparticlemodel.
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
.............................................................................................................................................. [3]
Question 3 continues on the next page.
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0620/32/F/M/18© UCLES 2018
(b) Thetableshowsthepropertiesofsomehalogens.
halogen meltingpointin°C
boilingpointin°C
densitywhenliquiding/cm3 colour
fluorine –220 –188
chlorine –29 1.56 lightgreen
bromine –7 59 3.12 red-brown
iodine 114 184 3.96 grey-black
(i) Completethetabletoestimate: ● thedensityofliquidfluorine ● themeltingpointofchlorine. [2]
(ii) Isfluorinelighterordarkerincolourthanchlorine? Explainyouranswer.
.............................................................................................................................................
....................................................................................................................................... [1]
(iii) Whatisthephysicalstateofbromineat40°C? Giveareasonforyouranswer.
.............................................................................................................................................
....................................................................................................................................... [2]
(c) Complete the chemical equation for the reaction of aqueous bromine with aqueouspotassiumiodide.
......+2KI I2+.....KBr [2]
[Total:10]
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4 Thisquestionisaboutorganiccompounds.
(a) Whichtwostatementsaboutmembersofahomologousseriesarecorrect? Ticktwoboxes.
Theyhavesimilarchemicalproperties.
Theyhavesimilarphysicalproperties.
Theyhavethesamefunctionalgroup.
Theyhavethesamerelativemolecularmass.
Theyhavethesamenumberofcarbonatoms. [2]
(b) Towhichhomologousseriesdomethaneandethanebelong?
.............................................................................................................................................. [1]
(c) Methaneandethanearebothhydrocarbons.
Whatismeantbythetermhydrocarbon?
....................................................................................................................................................
.............................................................................................................................................. [2]
(d) Drawthestructureofethaneshowingalloftheatomsandallofthebonds.
[1]
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0620/32/F/M/18© UCLES 2018
(e) Thehydrocarbontetradecane,C14H30,canbecrackedtoformamixtureofalkanesandalkenes.
(i) Statetwoconditionsneededforcracking.
1 ..........................................................................................................................................
2 .......................................................................................................................................... [2]
(ii) Complete the chemical equation for the cracking of tetradecane to form two differenthydrocarbons.
C14H30 C3H6+.................... [1]
(f) Ethanolcanbemanufacturedfromethene.
Completethewordequationforthisreaction.
ethene+.............................. ethanol [1]
(g) Ethenecanbepolymerisedtoformpoly(ethene).
Completethesentenceaboutthisreactionusingwordsfromthelist.
addition condensation ions monomers oxidation polymers
Ethene..............................combinetoformpoly(ethene)by..............................polymerisation. [2]
[Total:12]
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5 Thisquestionisaboutmetals.
(a) Magnesiumismanufacturedbytheelectrolysisofmoltenmagnesiumchloride.
unreactive
gas in
unreactive
gas outanode (+)
cathode (–)
molten magnesium
molten magnesium chloride
(i) Whatinformationinthediagramshowsthatmoltenmagnesiumislessdensethanmoltenmagnesiumchloride?
....................................................................................................................................... [1]
(ii) Oneoftheproductsofthiselectrolysisismagnesium.
Statethenameoftheotherproduct.
....................................................................................................................................... [1]
Anunreactivegasisblownoverthesurfaceofthemoltenmagnesium.
(iii) Suggest why an unreactive gas and not air is blown over the surface of the moltenmagnesium.
....................................................................................................................................... [1]
(iv) Suggestthenameofanunreactivegaswhichcouldbeused.
....................................................................................................................................... [1]
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(b) Thetableshowssomepropertiesoffourmetals.
metal densitying/cm3
meltingpointin°C
relativestrength
relativeelectricalconductivity
aluminium 2.7 660 7 9
cobalt 8.9 1495 21 4
gallium 5.9 30 1 1
nickel 8.9 1455 20 3
Answerthesequestionsusingonlytheinformationshowninthetable.
(i) Whichmetalismostsuitabletomakethebodyofanaircraft? Giveareasonforyouranswer.
.............................................................................................................................................
....................................................................................................................................... [2]
(ii) Whichmetalismostsuitabletouseforoverheadpowercables? Giveareasonforyouranswer.
.............................................................................................................................................
....................................................................................................................................... [2]
(iii) Whichtwometalsinthetablearetransitionelements?
...............................................................and................................................................ [1]
(c) GivetwopropertiesoftransitionelementswhicharenotshownbyGroupIelements.
1 .................................................................................................................................................
2 ................................................................................................................................................. [2]
(d) Cobaltisaddedtoirontomakesteelalloys.
(i) Whatismeantbythetermalloy?
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Giveonereasonwhyalloysareusedinsteadofpuremetals.
....................................................................................................................................... [1]
[Total:13]
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6 Thisquestionisaboutsulfuranditscompounds.
(a) Naturalgascontainshydrocarbonsandhydrogensulfide.
(i) Givethenameofthehydrocarbonwhichispresentinthegreatestconcentrationinnaturalgas.
....................................................................................................................................... [1]
(ii) Hydrogensulfideisremovedfromnaturalgasbyreactionwithoxygeninthepresenceofacatalyst.
Whatisthepurposeofacatalyst?
....................................................................................................................................... [1]
(b) (i) Nametheacidmanufacturedfromsulfur.
....................................................................................................................................... [1]
(ii) Whenfossilfuelscontainingsulfurareburned,sulfurdioxideisformed. Sulfurdioxidecontributestoacidrain.
Giveoneharmfuleffectofacidrainonbuildings.
....................................................................................................................................... [1]
(iii) Sulfurdioxideisoxidisedbynitrogendioxideintheatmospheretoformsulfurtrioxide.
SO2 + NO2 SO3 + NO
Howdoesthisequationshowthatsulfurdioxideisoxidised?
.............................................................................................................................................
....................................................................................................................................... [1]
[Total:5]
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7 Acidshavecharacteristicchemicalproperties.
(a) Describethereactionsofhydrochloricacidwith: ● calciumoxide ● magnesium ● anamedindicatorofyourchoice.
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
.............................................................................................................................................. [5]
(b) Acidsreactwithalkalissuchassodiumhydroxide.
(i) Whattypeofchemicalreactionisthis?
....................................................................................................................................... [1]
(ii) WhichoneofthefollowingpHvaluesisthepHofanaqueoussolutionofsodiumhydroxide? Drawacirclearoundthecorrectanswer.
pH2pH5pH7pH13 [1]
(iii) Amixtureofsodiumhydroxideandammoniumsulfateiswarmedgently.
Statethenameofthegasproduced.
....................................................................................................................................... [1]
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(iv) Themeltingpointofsodiumhydroxideis319°C. Theboilingpointofsodiumhydroxideis1390°C.
Whichoneofthefollowingstatementsaboutsodiumhydroxideiscorrect? Tickonebox.
Puresodiumhydroxidemeltsoverarangeoftemperatures.
Impuresodiumhydroxidehasasharpmeltingpoint.
Puresodiumhydroxideboilsbetween319°Cand1390°C.
Puresodiumhydroxidehasasharpboilingpoint. [1]
(v) Sodiumhydroxideisusedinthemanufactureofsomemedicines.
Whyisitimportantthattheingredientsusedinmedicinesarepure?
....................................................................................................................................... [1]
[Total:10]
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8 Thisquestionisaboutironanditscompounds.
(a) Astudentinvestigatestherateofreactionof1gofironpowderwith25cm3ofhydrochloricacidofconcentration2.0mol/dm3.Thetemperatureis20°C.
Whateffectdothefollowinghaveontheinitialrateofthisreaction?
(i) Usinghydrochloricacidofconcentration1.2mol/dm3. Allotherconditionsarekeptthesame.
....................................................................................................................................... [1]
(ii) Usingapieceofironofmass1g. Allotherconditionsarekeptthesame.
....................................................................................................................................... [1]
(iii) Carryingouttheexperimentat25°C. Allotherconditionsarekeptthesame.
....................................................................................................................................... [1]
(b) Sideriteisanoreofiron.
(i) Statethenameofoneotheroreofiron.
....................................................................................................................................... [1]
(ii) Sideritecontainsmainlyiron(II)carbonate.
Describehowtoshowthatsideritecontainsacarbonate.
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [3]
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0620/32/F/M/18© UCLES 2018
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.
(c) Ironcanbeextractedfromitsoxidebyreductionwithcarbon. Thetableshowshoweasyitistoreducefourmetaloxidesbyheatingwithcarbon.
metaloxide easeofreductionwithcarbon
bismuth(III)oxide onlyreducedabove250°C
iron(III)oxide onlyreducedabove650°C
tin(II)oxide onlyreducedabove500°C
titanium(IV)oxide notreducedat700°C
Usethisinformationtoputthemetalsinorderoftheirreactivity.Puttheleastreactivemetalfirst.
least reactive most reactive
[2]
[Total:9]
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0620/32/F/M/18© UCLES 2018
Gro
up
Th
e P
eri
od
ic T
ab
le o
f E
lem
en
ts
1 Hh
yd
rog
en
1
2
He
he
lium
4
III
III
IVV
VI
VII
VII
I
3 Li
lith
ium
7
4 Be
be
rylli
um
9
ato
mic
nu
mb
er
ato
mic
sym
bo
l
Ke
y
na
me
rela
tive
ato
mic
ma
ss
11
Na
so
diu
m
23
12
Mg
ma
gn
esiu
m
24
19 K
po
tassiu
m
39
20
Ca
ca
lciu
m
40
37
Rb
rub
idiu
m
85
38
Sr
str
on
tiu
m
88
55
Cs
ca
esiu
m
13
3
56
Ba
ba
riu
m
13
7
87
Fr
fra
nciu
m
–
88
Ra
rad
ium
–
5 Bb
oro
n
11
13
Al
alu
min
ium
27
31
Ga
gallium
70
49
In
indium
115
81 Tl
thallium
204
6 Ccarbon
12
14 Si
silicon
28
32
Ge
germanium
73
50
Sntin
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
Wtungsten
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
Hg
mercury
201
112
Cn
copernicium
–
114
Fl
flerovium
–
116
Lv
livermorium
–
7 Nnitrogen
14
15 P
phosphorus
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
Te
tellurium
128
84
Po
po
lon
ium
–
9 Fflu
orin
e
19
17
Cl
ch
lorin
e
35
.5
35
Br
bro
min
e
80
53 I
iod
ine
12
7
85
At
asta
tin
e
–
10
Ne
ne
on
20
18
Ar
arg
on
40
36
Kr
kry
pto
n
84
54
Xe
xe
no
n
13
1
86
Rn
rad
on
–
21
Sc
sca
nd
ium
45
39 Y
ytt
riu
m
89
57
–7
1
lan
tha
no
ids
89
–1
03
actin
oid
s
57
La
lan
tha
nu
m
13
9
89
Ac
lan
tha
no
ids
actin
oid
s
Th
e v
olu
me
of
on
e m
ole
of
an
y g
as is 2
4 d
m3 a
t ro
om
te
mp
era
ture
an
d p
ressu
re (
r.t.
p.)
.
actin
ium
–
58
Ce
ce
riu
m
140
90
Th
thorium
232
59
Pr
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
–
