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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 2019
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
Cambridge Assessment International Education
Cambridge International General Certificate of Secondary Education
This document consists of 16 printed pages.
[Turn overIB19 03_0620_32/4RP
© UCLES 2019
*9386818547*
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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1 This question is about electronic structures.
(a) Theelectronicstructuresoffiveatoms,A,B,C,D and E,areshown.
A B C D E
Answerthefollowingquestionsabouttheseelectronicstructures. Eachelectronicstructuremaybeusedonce,morethanonceornotatall.
Statewhichelectronicstructure,A,B,C,D or E,representsanatom:
(i) ofanelementinGroupIIIofthePeriodicTable............................................................ [1]
(ii) ofamonatomicgas ...................................................................................................... [1]
(iii) of carbon ....................................................................................................................... [1]
(iv) whichhas18protons .................................................................................................... [1]
(v) whichformsastableionwithasinglenegativecharge. ............................................... [1]
(b) Drawtheelectronicstructureofasiliconatom.
[2]
[Total:7]
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2 Thisquestionisabouturaniumanditscompounds.
(a) (i) Anisotopeofuraniumisrepresentedbythesymbolshown.
235U92
Deducethenumberofelectronsandneutronsinoneatomofthisisotopeofuranium.
numberofelectrons ............................................................................................................
numberofneutrons ............................................................................................................ [2]
(ii) Statethemainuseofthisisotopeofuranium.
....................................................................................................................................... [1]
(b) Completethesentenceaboutisotopesusingwordsfromthelist.
atoms compound electrons element ions
mixture molecules neutrons substance
Isotopes are ................................. of the same ................................. which have the same
protonnumberbutadifferentnumberof.................................. [3]
(c) Uraniumisametal.
Givetwophysicalpropertieswhicharecharacteristicofallmetals.
1 .................................................................................................................................................
2 .................................................................................................................................................
[2]
(d) Uraniumreactswithhydrogentoformuraniumhydride,UH3.
Thereactionisreversible.
Completethechemicalequationforthisreactionby:
● balancingtheequation ● drawingthesymbolforareversiblereactioninthebox.
2U+.....H2 ….UH3
[3]
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(e) AcompoundofuraniumhastheformulaUO2F2.
CompletethetabletocalculatetherelativeformulamassofUO2F2.
UseyourPeriodicTabletohelpyou.
numberofatoms relativeatomicmass
uranium 1 238 1 ×238=238
oxygen
fluorine
relativeformulamass=.............................. [2]
[Total:13]
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3 Thisquestionisaboutsulfur,sulfurcompoundsandthewaterfromasulfurspring.Asulfurspringisanaturalsourceofwatercontainingsulfur.
(a) Thetableshowsthemassofionspresentina1000cm3sampleofwaterfromasulfurspring.
ionpresent formulaofion masspresentinthe1000cm3sample/mg
Br – 4
calcium Ca2+ 44
chloride Cl – 14
fluoride F – 6
iron(III) Fe3+ 2
magnesium Mg2+ 10
K+ 8
sodium Na+ 88
sulfate SO42– 92
Answerthesequestionsusingonlyinformationfromthetable.
(i) Whichnegativeionispresentinthelowestconcentration?
....................................................................................................................................... [1]
(ii) GivethenameofthecompoundformedfromonlyK+ and Br – ions.
....................................................................................................................................... [1]
(iii) Calculatethemassofcalciumionspresentina250cm3sampleofthiswater.
massofcalciumions=..............................mg[1]
(iv) Completetheequationtoshowtheformationofafluorideionfromafluorineatom.
F + ....... F –
[1]
(b) Describe a test for sulfate ions.
test .............................................................................................................................................
observations .............................................................................................................................. [2]
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(c) Solidsulfurisfoundaroundtheedgeofsulfursprings.
(i) Whenheated,sulfurundergoessublimation.
Whatismeantbythetermsublimation?
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Sulfurreactswithhotconcentratedsulfuricacid.
Completethechemicalequationforthisreaction.
S+.....H2SO4 2H2O+.....SO2 [2]
(iii) Thetableshowsthesolubilityofsulfurandzincinanorganicsolventandinwater.Theorganicsolventboilsat46°C.
element solubilityinorganicsolvent solubilityinwater
sulfur soluble insoluble
zinc insoluble insoluble
Usetheinformationinthetabletosuggesthowtoobtainpure,drysamplesofbothsulfurandzincfromamixtureofsulfurpowderandzincpowder.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [4]
(d) Thestructureofasulfurcompoundisshown.
S
F
F
FF
OF F
Deducethemolecularformulaofthiscompoundshowingthenumberofsulfur,fluorineandoxygenatoms.
.............................................................................................................................................. [1]
[Total:14]
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4 Astudent investigated the reactionbetweenzincanddilutehydrochloricacidbymeasuring thevolumeofhydrogengasproducedatoneminuteintervals.
Zn+2HCl ZnCl 2+H2
(a) Givethenameofthesaltformedinthisreaction.
.............................................................................................................................................. [1]
(b) Thegraphshowstheresultsusingsmallpiecesofzincanddilutehydrochloricacid.
100
80
60
40
20
00 1 2 3 4 5
volume of
hydrogen gas
/ cm3
time / minutes
(i) Deducethevolumeofhydrogengasproducedinthefirsttwominutesofthereaction.
..............................cm3 [1]
(ii) DrawaletterS on the graph toshowwherethereactionisslowingdownbuthasnot
stoppedcompletely. [1]
(iii) Drawalineon the gridtoshowhowthevolumeofhydrogengaschangeswithtimewhenthereactionisrepeatedwithacatalyst.
Allotherconditionsarekeptthesame. [2]
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(iv) Whateffectdothefollowinghaveontherateofthisreaction?
● Decreasingthetemperatureatwhichthereactionisdone. Allotherconditionsarekeptthesame.
.............................................................................................................................................
● Usingzincpowderinsteadofsmallpiecesofzinc. Allotherconditionsarekeptthesame.
............................................................................................................................................. [2]
(c) Describeatestforhydrogen.
test .............................................................................................................................................
result .......................................................................................................................................... [2]
(d) Thetablegivessomeinformationabouttherateofreactionofzincandsomeothermetalswithcoldwaterandwithsteam.
metalrate of reaction
withcoldwater withsteam
iron no reaction hotironreactsveryslowly
magnesium reactsveryslowly hotmagnesiumreactsrapidly
mercury no reaction no reaction
strontium reactsrapidly reactsrapidly
zinc no reaction hotzincreactsslowly
Putthefivemetalsinorderoftheirreactivity. Putthemostreactivemetalatthetop.
mostreactive
leastreactive
[2]
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(e) When13.0gofzincreactscompletelywithsulfur,19.4gofzincsulfideisformed.
Calculatethemaximummassofzincsulfideformedwhen3.25gofzincreactscompletelywithsulfur.
massofzincsulfideformed=..............................g[1]
[Total:12]
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5 Aqueoussodiumhydroxideisabase.
(a) Describethereactionofaqueoussodiumhydroxidewith:
● anamedacid
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
● ammoniumsalts
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
● anamedindicator.
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
[5]
(b) Ammoniaisasolublebase.
Which oneofthefollowingpHvaluescouldbethepHofaqueousammonia? Drawacirclearoundthecorrectanswer.
pH1pH5pH7pH10 [1]
(c) Ammoniaisusedinthemanufactureofsomefertilisers.
Which twoofthesecompoundsarepresentinfertilisers? Tick twoboxes.
copper(II)oxide
potassiumchloride
sodiumphosphate
strontiumfluoride
sulfurdioxide [2]
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(d) Bacteriainthesoilareabletoconvertammoniumcompoundsintooxidesofnitrogen. Theoxidesofnitrogencanescapeintotheatmosphere.
(i) State oneothersourceofoxidesofnitrogenintheatmosphere.
....................................................................................................................................... [1]
(ii) State oneeffectofoxidesofnitrogenonhealth.
....................................................................................................................................... [1]
(iii) Oxidesofnitrogenaregreenhousegaseswhichcontributetoclimatechange.
Givethenameofoneothergreenhousegaswhichmakesamajorcontributiontoclimatechange.
....................................................................................................................................... [1]
[Total:11]
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6 Thisquestionisaboutchromiumandchromiumcompounds.
(a) (i) Suggest why chromium is manufactured by electrolysis and not by the reduction ofchromium(VI)oxide,CrO3,withcarbon.
....................................................................................................................................... [1]
(ii) Suggesttheproductsofelectrolysisofmoltenchromium(VI)oxideat:
● thepositiveelectrode ...................................................................................................
● thenegativeelectrode. ................................................................................................ [2]
(b) Chromium can also bemanufactured by the reduction of chromium(III) oxide,Cr2O3, withaluminium.
Cr2O3 + 2Al Al 2O3 + 2Cr
(i) Howdoesthisequationshowthatchromium(III)oxideisreduced?
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Theenergyleveldiagramforthisreactionisshown.
energy
progress of reaction
Cr2O3 + 2Al
Al 2O3 + 2Cr
Explainhowthisdiagramshowsthatthereactionisexothermic.
.............................................................................................................................................
....................................................................................................................................... [1]
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(c) Chromiumisatransitionelement.SodiumisanelementinGroupIofthePeriodicTable.
Describe twowaysinwhichthepropertiesofchromiumaredifferentfromthoseofsodium.
1 .................................................................................................................................................
2 ................................................................................................................................................. [2]
(d) Chromiumisasilver-colouredmetal.
Thediagramshowshowacopperspooncanbeelectroplatedwithchromium.
power
supply
(i) Onthediagram,label:
● thecathode ● theelectrolyte. [2]
(ii) Giveoneobservationthatismadeduringtheelectroplatingprocess.
....................................................................................................................................... [1]
(iii) Suggestonereasonwhymetalobjectsareelectroplated.
....................................................................................................................................... [1]
(e) Nichromeisanalloyofnickel,ironandchromium.
Which oneofthesediagrams,J,K,L or M,bestrepresentsnichrome?
J K L M
.............................................................................................................................................. [1]
[Total:12]
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7 Thisquestionisaboutalkanesandpetroleumfractions.
(a) Thetablegivessomeinformationaboutalkanes.
alkanenumberofcarbon
atomsineachmoleculemeltingpoint
in °Cboilingpoint
in °C
methane 1 –182 –164
ethane 2 –183 –88
propane 3 –190 –42
butane 4 –135 0
Answerthesequestionsusingonlyinformationfromthetable.
(i) Describehowtheboilingpointsofthealkanesvarywiththenumberofcarbonatomsineachmolecule.
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Whichalkanehasthelowestmeltingpoint?
....................................................................................................................................... [1]
(iii) Deducethephysicalstateofbutaneat–50°C. Explainyouranswer.
.............................................................................................................................................
....................................................................................................................................... [1]
(b) (i) Completethedot-and-crossdiagramtoshowtheelectronarrangementinamoleculeofmethane.Showoutershellelectronsonly.
C
H
H
HH
[1]
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0620/32/F/M/19© UCLES 2019
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.
(ii) Completethewordequationforthecompletecombustionofmethane.
methane+oxygen ....................................
....................................
+....................................
[2]
(c) Completethesentencesabouthomologousseriesusingwordsfromthelist.
acidic alkenes alcohol carbohydrates
chemical functional hydrocarbons physical
Methaneandethaneare.................................whichbelongtothesamehomologousseries.
Membersofthealkanehomologousserieshavesimilar.................................propertiesdue tothepresenceofthesame.................................group.
[3]
(d) Petroleumisseparatedintousefulfractionsbyfractionaldistillation.
Matchthefractionsontheleftwiththeusesontheright. Thefirstonehasbeendoneforyou.
fraction use
refinerygas fuel for aircraft
bitumen bottledgasforheating
kerosene fraction makingchemicals
naphthafraction makingroads
[2]
[Total:11]
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0620/32/F/M/19© UCLES 2019
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
–
