ChemistryH2P2questionpaper.docx

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ChemistryH2P2questionpaper.docx

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ChemistryH2P2questionpaper.docx

ChemistryH2P2questionpaper

SERANGOONJUNIORCOLLEGE

GeneralCertificateofEducationAdvancedLevel

Higher2

CANDIDATE

NAME

CLASSINDEXNUMBER

CHEMISTRY9647/02,9746/02

PreliminaryExamination23August2010

Paper2StructuredQuestion（SPA）2hrs,1½hr

AdditionalMaterials:

DataBooklet

WritingPapers

CandidatesanswerontheQuestionPaper.

READTHESEINSTRUCTIONSFIRST

Writeyournameandclassonalltheworkyouhandin.

Writeindarkblueorblackpenonbothsidesofthepaper.

Youmayuseasoftpencilforanydiagrams,graphsorroughwork.

Answerallquestionsinthespaceprovided.

Questions6isaSPAPlanningQuestionforstudentstakingthe9647syllabus.Youareadvisedtospend30minutesonquestion6.

Attheendoftheexamination,fastenallyourworksecurelytogether.

Thenumberofmarksisgiveninthebrackets[]attheendofeachquestionorpartquestions.

ForExaminer’sUse

/12

6（P）

For9647

/12

TOTAL

Thisdocumentconsistof18printedpagesandNOblankpage

Answerallquestions

ThegraphbelowshowsthefirsteightsuccessiveionisationenergiesofXagainsttheorderofremovalofelectrons.

（a）

Fromthegraph,deducewhichgroupoftheperiodictabledoeselementXbelongsto.

[2]

………………………………………………………………………………………………………...

（b）

GiventhatelementXisfromperiod3,identifyelementX.

[1]

………………………………………………………………………………………………………...

（c）

WriteabalancedchemicalequationfortheformationoftheoxideofelementXandbymeansofbalancedequations,indicatewhethertheoxidereactswithaqueousNaOHandHCl（aq）.

[3]

………………………………………………………………………………………………………...

（d）

WriteabalancedchemicalequationfortheformationofthechlorideofelementX.

[1]

………………………………………………………………………………………………………...

（e）

ExplainthereactionsofthechlorideofelementXwithwater.Includeallrelevantequations.

[3]

………………………………………………………………………………………………………...

（f）

ExplainwhetherXortheelementbelowXinthesamegroupwillhavehigherfirstionisationenergy.

[2]

………………………………………………………………………………………………………...

Total:

12marks

Stearicacidispresentinanimalfatsandglucoseispresentinanimalglycogen.Theenthalpychangeofcombustiondataofthesetwocompoundsareshowninthetablebelow.

Compound

Stearicacid,C18H36O2（s）

Glucose,C6H12O6（s）

ΔHc/kJmol–1

–11400

–2810

（a）

Bycomparingtheenthalpiesofcombustion,commentonthefactthatarcticanimalsstoretheirenergymainlyintheformoffats,whereastropicalanimalsstoretheirenergymainlyintheformofglycogen.

[1]

………………………………………………………………………………………………………...

（b）

Byconsideringthenumberofloneandbondpairofelectrons,drawtheLewisstructureandpredictthegeneralshapesofthefollowingmoleculesorions:

（i）

F2O

（ii）

H3O+

[4]

（c）

Architecturalandothermodelsareoftenmadefrombrass（analloyofcopperandzinc）.

Theprocessofmakingabrasswindowframeisasfollowed:

1.Thepatternofawindowframeisdrawnonthebrassusingaspecialink.

2.Theunprotectedbrass（notcoveredbyink）isremovedbyusingdilutehydrochloricacidandtheoutlineoftheframeremains.

WiththeaidoftheDataBooklet,identifythemetalthatdissolvesindilutehydrochloricacid.Explainyouranswer.

[3]

（d）

Aheartpacemakerconsistingofzincandplatinumelectrodes,isimplantedintothebodytissues.Theseelectrodesintheoxygen-containingbodyfluid,withapHof7.4,formacellinwhichzincisoxidisedandoxygenisreduced.

（i）

Writeabalancedequationfortheoverallreactionthattakesplacewhenacurrentflows.

………………………………………………………………………………………………………...

（ii）

HowwouldtheEθcellvaluechangeifahumanwiththeheartpacemakerundergoesaperiodofintenseexercise?

Explainyouranswer.

[4]

………………………………………………………………………………………………………...

Total:

12marks

（a）

Toextracttitaniumfromitsorerutile,TiO2,theoreisfirstmixedwithcokeandthemixturewasreactedwithchlorineat800oCto1000oC.Thereactionyieldtitanium（IV）chloridegasandcarbonmonoxidegas.

Thenextstepisthereductionofthechloridebymagnesiumunderablanketofnoblegas.Thereductiontemperatureisatabout850oCto900oCandaspongymassoftitaniumisobtainedandthemagnesiumchlorideistappedofffromtimetotimeandrecycled.

Substance

Meltingpoint（oC）

Titanium（IV）chloride

-24.8

Titaniumoxide

1843

Magnesium

650

Magnesiumchloride

714

（i）

Usingthedataandinformationgiven,constructthechemicalequations,withstatesymbols,oftheabovementionedprocedure.

………………………………………………………………………………………………………...

（ii）

Hence,usingtheequationsin（i）,determinethemassofrutilerequiredtoproduce100goftitaniummetal.

[3]

（b）

BrieflyrelatetherateofSN2reactionofCH3BrwiththeCH3O-andCH3CO2-nucleophiles.

[2]

………………………………………………………………………………………………………...

（c）

Outlinepossiblesynthesisforeachofthefollowingcompoundsfromthegivenstartingmaterials.[4]

（i）

CH3CH2COOHtoCH3CH2CH2CN

（ii）

CH3CH2CH2OHtoCH3CH2CH（OH）CO2H

（d）

Suggestmethodsbywhichthefollowingcompoundscouldbedistinguishedfromeachotherusingchemicaltests.Thechemicaltestsmayrelyonapreliminarybreak-upofthecompoundsandsubsequenttestingofthereactionproducts.[3]

（i）

and

ChemicalTest（s）:

………………………………………………………………………………………………………..

Observations:

………………………………………………………………………………………………………..

（ii）

and

ChemicalTest（s）:

………………………………………………………………………………………………………..

Observations:

………………………………………………………………………………………………………..

Total:

12marks

（a）

Drawtheorganicproduct（s）ofeachreactioncarriedoutoncompoundX.

CompoundX

AcidifiedKMnO4,

Heat

AqueousNaOH,heat

[4]

（b）

ThediagrambelowshowsasegmentofapolypeptidechainYofaprotein.

（i）

Astrandofpolypeptidechainwouldcontinuetofoldfurtherintostructuralpatternofalpha-helixorbeta-pleatedsheetstogainextrastability.

Usingaclearlylabelleddiagram,describethealpha-helixstructure.

………………………………………………………………………………………………………...

（ii）

ExplainwhythepolypeptidechainYgiveninthequestionwillnotcoilintoanalphahelixstructure.

………………………………………………………………………………………………………...

[3]

（c）

Interpreteachofthefollowingobservationasfullyasyoucan.Usediagramorequation（s）inyourinterpretationifapplicable.

（i）

Therelativemolecularmassofethanoicacidinbenzeneis120,butmeasurementofthedensityofthevapourisconsistentwitharelativemolecularmassof60.

………………………………………………………………………………………………………...

（ii）

ThepHoftheend-pointinthetitrationofethanoicacidwithsodiumhydroxideisgreaterthan7.

[5]

………………………………………………………………………………………………………...

Total:

12marks

（a）

Vitaminsareessentialorganicmoleculesthatareessentialtothewellbeingofourhumanhealth.Fourvitaminmoleculesaregivenbelow:

VitaminAVitaminB7

VitaminD3VitaminK3

（i）

StateonereagentandconditionthatwillreactwithvitaminAandnotwithvitaminK3anddescribewhatwouldbeobserved.

Reagentandcondition:

…...………………………………………………………………………

Observation:

……………………………………..…………………………………………………

（ii）

Stateonereagentandcondition,otherthanoxidisingagentsthatwillreactwithvi

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