UNIVERSITYOFCAMBRIDGEINTERNATIONALEXAMINATIONS

InternationalGeneralCertificateofSecondaryEducation

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CHEMISTRY 0620/53

Paper5PracticalTest October/November2012

1hour15minutes

CandidatesanswerontheQuestionPaper.

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AdditionalMaterials: AslistedintheConfidentialInstructions

READTHESEINSTRUCTIONSFIRST

WriteyourCentrenumber,candidatenumberandnameonalltheworkyouhandin.Writeindarkblueorblackpen.

Youmayuseapencilforanydiagrams,graphsorroughworking.Donotusestaples,paperclips,highlighters,glueorcorrectionfluid.DONOTWRITEINANYBARCODES.

Answerallquestions.

Practicalnotesareprovidedonpage8.

At oftheexamination,fastenallyourworksecurelytogether.

Thenumberofmarksisgiveninbrackets[]at ofeachquestionorpartquestion.

ForExaminer’sUse

Total

This consistsof8printedpages.

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1 Youaregoingtoinvestigatewhathappenswhenaqueoussodiumhydroxidereactswithtwodifferentacids,GandH.

Readalltheinstructionsbelowcarefullybeartingtheexperiments.Instructions

Youaregoingtocarryouttwoexperiments.

Experiment1

Useameasuringcylindertopour20cm3ofsolutionGintothepolystyrenecupprovided.Putthecupintoa250cm3beakerforsupport.Measuretheinitialtemperatureofthesolutionandrecorditinthetablebelow.

Filltheburettewiththeaqueoussodiumhydroxideprovidedtothe0.0cm3mark.

Add5.0cm3ofaqueoussodiumhydroxidetothesolutionofGinthecupandstirthemixture.

Measureandrecordthe umtemperatureofthesolutioninthetablebelow.Addafurther5.0cm3ofaqueoussodiumhydroxidetothecupandstirthemixture.Measureandrecordtheumtemperatureofthemixtureinthetablebelow.

Continuetoadd5.0cm3portionsofaqueoussodiumhydroxidetothecup,untilatotalvolumeof40cm3ofaqueoussodiumhydroxidehasbeenadded.Stiraftereachadditionandmeasureandrecordthe umtemperaturesinthetable.

Pourthesolutionawayandrinsethepolystyrenecup.

volumeofaqueoussodiumhydroxideadded/cm3

umtemperatureofsolutioninpolystyrenecup/C

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

[3]

ForExaminer’sUse

Experiment2

RepeatExperiment1using20cm3ofsolutionHinsteadof20cm3ofsolutionG.Recordyourresultsinthetablebelow.

ForExaminer’sUse

volumeofaqueoussodiumhydroxideadded/cm3

umtemperatureofsolutioninpolystyrenecup/C

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

[3]

PlottheresultsforExperiments1and2onthegridanddrawtwosmoothlinegraphs.Clearlylabelyourgraphs.

ForExaminer’sUse

/C

umtemperatureofsolution

50

40

30

20

10

0 5 10 15 20 25 30 35 40

volumeofaqueoussodiumhydroxide/cm3

[6]

Useyourgraphtoestimatethe umtemperatureofthereactionmixturewhen8cm3ofaqueoussodiumhydroxidewereaddedto20cm3ofthesolutionofacidG.Showclearlyonthegraphhowyouworkedoutyouranswer.

. [2]

Whattypeofchemicalreaction,otherthanneutralisation,occurswhenacidHreactswithaqueoussodiumhydroxide?

. [1]

(i)Inwhichexperimentisthetemperaturechangegreater?

. [1]

(ii)Suggestwhythetemperaturechangeisgreaterinthi periment.

. [1]

PredictthetemperatureofthemixtureinExperiment2aftertwohours.Exinyouranswer.

. [2]

[Total:19]

ForExaminer’sUse

2 Youareprovidedwithtwosaltsolutions,JandK.

CarryoutthefollowingtestsonJandK,recordingallofyourobservationsinthetable.Conclusionsmustnotbewritteninthetable.

ForExaminer’sUse

tests

observations

testsonsolutionJ

(a)DescribetheappearanceofJ.

[1]

(b)Toabout1cm3ofthesolution,addanequalvolumeofaqueoussodiumhydroxide.Leavetostandforfiveminutes.Noteanychanges.

. [2]

(c)Toabout1cm3ofthesolution,addanequalvolumeofhydrogenperoxide.

Testthegasgivenoff.

. [3]

(d)Toabout1cm3ofthesolution,addabout1cm3ofaqueousammonia.

[1]

(e)Toabout1cm3ofthesolution,addafewdropsofdilutenitricacidfollowedbyaqueoussilvernitrate.

[1]

(f)Toabout1cm3ofthesolution,addafewdropsofdilutenitricacidfollowedbybariumnitratesolution.

[2]

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tests

observations

testsonsolutionK

(g)DescribetheappearanceofK.

. [1]

(h)Toabout1cm3ofthesolution,add5dropsofaqueoussodiumhydroxide.

Now add excess aqueous sodiumhydroxide.

. [3]

(i)Toabout1cm3ofthesolution,addabout2cm3ofaqueoussodiumhydroxideandonespatulameasureofaluminiumpowder.Heatthemixturegently.

Testthegasgivenoff.

. [2]

WhatconclusionscanyoudrawaboutsolutionJ?

. [3]

WhatconclusionscanyoudrawaboutsolutionK?

. [2]

[Total:21]

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NOTESFORUSEINQUALITATIVEYSIS

Testforanions

anion

test

testresult

carbonate(CO2–)

3

adddiluteacid

effervescence,carbondioxideproduced

chloride(Cl–)[insolution]

acidifywithdilutenitricacid,thenaddaqueoussilvernitrate

whiteppt.

iodide(I–)[insolution]

acidifywithdilutenitricacid,thenaddaqueoussilvernitrate

yellowppt.

nitrate(NO–)

3

[insolution]

addaqueoussodiumhydroxidethenaluminiumfoil;warmcarefully

ammoniaproduced

sulfate(SO2–)

4

[insolution]

acidifywithdilutenitricacid,thenaqueousbariumnitrate

whiteppt.

Testforaqueouscations

cation

effectofaqueoussodiumhydroxide

effectofaqueousammonia

aluminium(Al3+)

whiteppt.,solubleinexcessgivingacolourlesssolution

whiteppt.,insolubleinexcess

ammonium(NH4)

+

ammoniaproducedonwarming

–

calcium(Ca2+)

whiteppt.,insolubleinexcess

noppt.,orveryslightwhiteppt.

copper(Cu2+)

lightblueppt.,insolubleinexcess

lightblueppt.,solubleinexcessgivingadarkbluesolution

iron(II)(Fe2+)

greenppt.,insolubleinexcess

greenppt.,insolubleinexcess

iron(III)(Fe3+)

red-brownppt.,insolubleinexcess

red-brownppt.,insolubleinexcess

zinc(Zn2+)

whiteppt.,solubleinexcessgivingacolourlesssolution

whiteppt.,solubleinexcessgivingacolourlesssolution

Testforgases

gas

testandtestresults

ammonia(NH3)

turnsdampredlitmuspaperblue

carbondioxide(CO2)

turnslimewatermilky

chlorine(Cl2)

bleachesdamplitmuspape