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Transcript of (GXFDWLRQ CHEMISTRY 0620/32 - GCE Guide (0620)/0620...4 UCES 2018 062032O18 (c) Lactic acid can...
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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.
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CHEMISTRY 0620/32Paper 3 Theory (Core) October/November 2018
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 overIB18 11_0620_32/3RP© UCLES 2018
*2139417189*
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
Answerthefollowingquestionsaboutthesestructures. Eachstructuremaybeusedonce,morethanonceornotatall. Statewhichstructure,A,B,C,D or E,represents:
(i) anatominGroupVIIIofthePeriodicTable.................................................................. [1]
(ii) anatomofareactivenon-metal................................................................................... [1]
(iii) anatomwithaprotonnumberof11............................................................................. [1]
(iv) anatomwithonlythree shells of electrons .................................................................. [1]
(v) anatomwhichformsastableionwithasinglepositivecharge................................... [1]
(b) Completethetabletoshowthenumberofelectrons,neutronsandprotonsinthenitrogenatomandchromiumionshown.
numberofelectrons
numberofneutrons
numberofprotons
15N7 7
52Cr 2+24 28
[3]
[Total:8]
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2 (a) Thetableshowstheconcentrationsoftheionspresentinasolutionobtainedfromcellsinthebody.
ionpresent formulaofion concentrationinmg/1000cm3
sodium Na+ 273
potassium K+ 540
calcium Ca2+ 3
magnesium Mg2+ 20
chloride Cl – 140
hydrogencarbonate HCO3– 730
phosphate PO43– 1
Answerthesequestionsusingonlyinformationfromthetable.
(i) Whichnegativeionispresentinthehighestconcentration?
....................................................................................................................................... [1]
(ii) Calculatethemassofpotassiumionspresentin250cm3ofthissolution.
massofpotassiumions=..............................mg[1]
(iii) Calculatethetotalmassofpositiveionspresentin1000cm3ofthissolution.
totalmassofpositiveions=..............................mg[1]
(iv) GivethenameofthecompoundformedfromNa+andHCO3–ions.
....................................................................................................................................... [1]
(b) Describewhatisobservedinthesetworeactions.
● AnexcessofaqueoussodiumhydroxideisaddedtoasolutioncontainingCa2+ions.
....................................................................................................................................................
● AnexcessofaqueousammoniaisaddedtoasolutioncontainingCa2+ions.
.................................................................................................................................................... [2]
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(c) Lacticacidcanbuildupinmusclecellsduringexercise. Thestructureoflacticacidisshown.
C
COOH
OHH
CH3
(i) Onthestructure,drawacirclearoundthecarboxylicacidfunctionalgroup. [1]
(ii) Deducethemolecularformulaoflacticacidshowingthenumberofcarbon,hydrogenandoxygenatoms.
....................................................................................................................................... [1]
(d) Lacticacidcanformapolymer.
Completethesentenceaboutpolymersusingwordsfromthelist.
atomic large molecular monomers polymers small
Duringpolymerisation..............................moleculescalled..............................jointogetherto formlong-chainmoleculeswithaveryhighrelative..............................mass.
[3]
[Total:11]
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3 (a) Thetablegivesinformationaboutthesolubilityofcopperandseleniuminanorganicsolventandinwater.Theorganicsolventboilsat30°C.
element solubilityinorganicsolvent
solubilityinwater
copper insoluble insoluble
selenium soluble insoluble
(i) Use the information in the table tosuggesthowyoucouldobtainpure,drysamplesofcopperandseleniumfromamixtureofcopperpowderandseleniumpowder.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [4]
(ii) Ethanolisanorganicsolvent.
Drawthestructureofethanol.Showalloftheatomsandallofthebonds.
[2]
(iii) Seleniumreactswithfluorinetoformselenium(VI)fluoride.
Balancethechemicalequationforthisreaction.
Se+.....F2 SeF6 [1]
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(b) Thechemicalequationforthereactionofcopperwithhotconcentratedsulfuricacidisshown.
Cu + 2H2SO4 CuSO4 + SO2 + 2H2O
(i) Completethewordequationforthisreaction.
copper + sulfuricacid
...........................
...........................
+ ...........................
...........................
+ ...........................
[2]
(ii) Oneofthecompoundsinthisequationisapollutantgaswhichcontributestoacidrain.
Identifythepollutantgasandstateacommonsourceofit.
pollutantgas.......................................................................................................................
source ................................................................................................................................. [2]
(c) Solid hydrated copper(II) sulfate decomposes to anhydrous copper(II) sulfate when it iscontinuouslyheated.
Isthisanendothermicoranexothermicreaction? Explainyouranswer.
....................................................................................................................................................
.............................................................................................................................................. [1]
[Total:12]
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4 Thisquestionisaboutacids.
(a) Thestructureoffumaricacidisshown.
CCOOH
CHHOOC
H
Fumaricacidisanunsaturatedcompound.
(i) Whatfeatureofthestructureoffumaricacidshowsthatitisunsaturated?
....................................................................................................................................... [1]
(ii) Describeatestforanunsaturatedcompound.
test ......................................................................................................................................
result ................................................................................................................................... [2]
(b) Hydroiodicacidcanbeusedforthereductionofsomecarboxylicacids.
(i) Whatismeantbythetermreduction?
....................................................................................................................................... [1]
(ii) Hydroiodicacidisoxidisedbyoxygen.
Balancethechemicalequationforthisreaction.
.....HI + O2 2H2O+.....I2 [2]
(iii) Whatpercentageofclean,dryairisoxygen?
....................................................................................................................................... [1]
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(c) Theconcentrationofadiluteacidcanbefoundbyreactingitwithaqueoussodiumhydroxideusingtheapparatusshown.
aqueoussodium hydroxide
dilute acid
conical flask
(i) What piece of apparatus should be used to add exactly 25.0cm3 of dilute acid to theconicalflask?
....................................................................................................................................... [1]
(ii) Afewdropsoflitmussolutionareaddedtotheconicalflask.
Explainwhylitmussolutionisaddedtotheconicalflask.
.............................................................................................................................................
....................................................................................................................................... [1]
(iii) Aqueoussodiumhydroxideisthenaddedtothediluteaciduntilitisinexcess.
Describethechangeinthecolourofthelitmussolutionintheconicalflask.
from.............................................................to.................................................................. [2]
[Total:11]
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5 Bromineisavolatileliquid.Potassiumbromideisacompoundmadefrombromine.
(a) Use the kinetic particlemodel to describe the arrangementandmotion of the particles inbrominewhenitis:
● aliquid
....................................................................................................................................................
....................................................................................................................................................
● agas
....................................................................................................................................................
.................................................................................................................................................... [4]
(b) Moltenpotassiumbromidecanbeelectrolysedusingtheapparatusshown.
+ –
powersupply
(i) Onthediagram,label: ● theanode ● theelectrolyte [2]
(ii) Predicttheproductsofthiselectrolysisat:
thepositiveelectrode..........................................................................................................
thenegativeelectrode........................................................................................................ [2]
(iii) Giveoneobservationthatismadeatthepositiveelectrode.
....................................................................................................................................... [1]
(iv) Suggestwhytheelectrodesaremadeofgraphiteandnotofmagnesium.
.............................................................................................................................................
....................................................................................................................................... [1]
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(c) Aqueouspotassiumbromidereactswithaqueouschlorine.
(i) Completethewordequationforthisreaction.
potassiumbromide + chlorine ..............................
..............................
+ ..............................
[2]
(ii) Usingideasaboutthereactivityofthehalogens,explainwhyaqueouspotassiumbromidedoesnotreactwithaqueousiodine.
.............................................................................................................................................
....................................................................................................................................... [1]
(iii) Describe what you would observe when aqueous silver nitrate is added to aqueouspotassiumbromide.
....................................................................................................................................... [2]
[Total:15]
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6 (a) Thediagramsshowthestructuresoffoursubstances,R,S,TandU.
R
T U
S
C
C C
H H
H H H H
C
C
H H
H H
C
C
H H
H H
C
C
H H
H H
C
C
H H
H H
OC
O
OC
OOC
O
OC
O
Ti Ti Ti
Ti Ti Ti
Ti
Ti Ti Ti Ti
NH4+NH4
+ Cl –
NH4+NH4
+ Cl –
NH4+ Cl –Cl –
Statewhichoneofthesesubstances,R,S,T or U:
(i) isanelement................................................................................................................ [1]
(ii) containsionicbonds ..................................................................................................... [1]
(iii) isagasatroomtemperature........................................................................................ [1]
(iv) isapolymer.................................................................................................................. [1]
(b) Ammoniumchlorideispresentinsomefertilisers.
Which twoofthefollowingcompoundsarealsopresentinmanyfertilisers? Ticktwoboxes.
hydrogensulfide
calciumphosphate
copper(II)fluoride
nickel(II)oxide
potassiumnitrate
[2]
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(c) Amixtureofammoniumchlorideandaqueoussodiumhydroxideisheatedasshown.
heat
mixture
filter paper soakedin methyl orangeand acid
Thefilterpaperchangescolourfromredtoyellow.
Explainwhy.
....................................................................................................................................................
.............................................................................................................................................. [2]
[Total:8]
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7 (a) Thegraphshowstheeffectoftemperatureontherateofreactionofdilutehydrochloricacidwithzincpowder.
25
20
15
10
5
00 10 20 30 40
temperature / °C
rate of reactionin cm3 gas / minute
50
(i) Determinetherateofreactionat40°C.
rateofreaction=..............................cm3gas/minute[1]
(ii) Theexperimentswererepeatedusingsmalllumpsofzincinsteadofzincpowder. Allotherconditionswerekeptthesame.
On the grid,drawagraphtoshowhowtherateofreactionchangeswithtemperaturewhensmalllumpsofzincareusedinsteadofzincpowder. [2]
(b) Whateffectsdothesefactorshaveontherateofachemicalreaction?
(i) decreasingtheconcentrationofareactant
....................................................................................................................................... [1]
(ii) addingacatalyst
....................................................................................................................................... [1]
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(c) Zincandironarebothmetals.
Givetwophysicalpropertieswhicharecharacteristicofmetals.
1 .................................................................................................................................................
2 ................................................................................................................................................. [2]
(d) Stainlesssteelisanalloyofiron.
(i) Whatismeantbythetermalloy?
....................................................................................................................................... [1]
(ii) Giveonecommonuseofstainlesssteel.
....................................................................................................................................... [1]
[Total:9]
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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.
8 ThetableshowsthepropertiesofsomeGroupIelements.
element densitying/cm3
meltingpointin °C
relativehardness
sodium 0.97 98 4.9
potassium 0.86 63 2.6
rubidium 1.53 1.6
caesium 29 1.0
(a) (i) DescribethetrendintherelativehardnessoftheGroupIelements.
....................................................................................................................................... [1]
(ii) Predictthemeltingpointofrubidium.
....................................................................................................................................... [1]
(iii) Explainwhyitisdifficulttopredictthedensityofcaesium.
.............................................................................................................................................
....................................................................................................................................... [1]
(b) Whenpotassiumreactswithwater,itfloatsandmeltsintoaball.Aflameisobserved.
(i) Whatcolourdoespotassiumgivetotheflame?
....................................................................................................................................... [1]
(ii) Usetheinformationinthetabletosuggestwhypotassiumfloatsonwater.
....................................................................................................................................... [1]
(iii) Hydrogenisproducedwhenpotassiumreactswithwater.
Completethedot-and-crossdiagramtoshowtheelectronarrangementinamoleculeofhydrogen.
H H
[1]
[Total:6]
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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
–