stpm_trial_chem_09_eng_p1

8/7/2019 STPM_Trial_Chem_09_Eng_P1

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2/17

CONFIDENTIAL-

Four suggesfedansurerslabelledA,corrcctanswer.

2SectionA

B, C andD arcgivenforeachquestion.Chooseone

B D abundance

ry'eratio

2. Theunitcellof a metalM is shownbelow.Giventhevolumeof the unitcellis Vr cm3andthevolumeof 1molof M atomsis V2cm3.Whatis thevalueof theAvogadroconstant?

1. Whichof thefollowingCF2C!I?flhe isotopesareA abundance

YzlVtNz lYi x7

sketchesshowpartofthemassspectrumof the refrigerant,: 1'c,ttF,tuc,ttcll

(VzlVr)x4M/Vr)x14

B.c.

A.c.

abundance

abundance

120 122 r24


3/17


4/17

CONFIDENTIAL*6. Inwhichpairof moleculesis thepermanentdipolein molecule/ greaterthanthatinmoleculell?

I t / ,

B CH3CHzCI cH3cHcl2

,rc\CCHs

t'fclAcrc l \ , /C=C/ \CHS CHS

c CId"'D CI

6.CII'IclCI7. The rateequationfor the decompositionofhydrogenbromide

2HB(g))Hz(9)+Brz(9)is: Rate= k[HBr]2

Whichof thefollowingconclusionscanbe drawnfromthisinformation?A Thevalueof k dependson the concentrationof HBr.B The rateof appearanceof Brzis halfthe rateof disappearanceof HBr.C Doublingthe concentrationof HBrwilldoublethe rateof reaction.D Thepresenceof a suitablecatalystwill increasethe valueof k.


5/17

CONFIDENTIAL*\'lirrhmeg{*nrruenfnnnod

8. Inthediagramabove,curveXwas obtainedby observingthe decompositionof 100cm3of1.0moldm-3hydrogenperoxide,catalysedby manganese(lV)oxide.

Whichalterationto theoriginalexperimentalconditionwouldproducecurve)?A AddingwaterB Addingsome0.1moldm-3hydrogenperoxideC Usinglessmanganese(lV)oxideD Loweringthetemperature

9. Thegraphbelowshowsthe variationof pHvaluewithvolumeof baseaddedin an acid-basetitration.

l4l3t2l ll098pH7 65432I0

Whichof thefollowingstatementsis not true aboutthetitrationabove?A Theacidandbaseusedin thetitrationmayprobablybe ethanoicacid

andsodiumhydroxiderespectively.B ThepK"of theacidusedis equalto 4.7.C Thesaltformedin thetitrationundergoeshydrolysisto produceOH-

ions.D A suitableindicatorfortheabovetitrationis methylorange.

Volumeof baseadded/crn3


6/17

CONFIDENTIAL"10. The pH of a 1.0mol dm-3solutionof a weakmonobasicacid is 5. What is thedissociationconstantof the weak acid?

A 1.0x 10amoldm'3B 1.0x 108mol dm-3C 1.0x 10 tomotdm-3D 1.0x 10lamoldm-3

11. Hydrogensulphidereactswith wateraccordingto the followingequation.

H2s(aq) + 2Hzo(aq) +' 2Hao*(aq) + S'- (aq)Whichof the followingaqueoussolutionswhenaddedwouldcausethe systemat

equilibriumto shiftto the left?A AmmoniumchlorideB SodiumcarbonateC SodiumethanoateD Ammonia

12. WhenthesystemChG) + PCls(g) +' PCl5(g)is in equilibriumat 600oC,at 1atmpressure,thevalueof theequilibriumconstant,Kois 30.\Nhatis thevalueof t$ at a pressureof 2 atmat the sametemperature?

A20830C.60D10013. A solute,S existsin the samemolecularstatewhendissolvedin ether and water.Whenthe two solutionsare in equilibrium,the concentrationof soluteS in ethersolutionis 6timeshigherthanthat of theaqueoussolution.A solutioncontaining14.0g of S in 240cmsofwateris extractedwith40 cm3of ether.Calculatethetotalmassof S extractedfromwater.

A 2.09B 6.0gC 7.09D 8.0g

10


7/17

CONFIDENTIAL-14. Whichof thefollowingboilingpoint- compositiondiagramsrepresentsa mixtureofwaterandhydrogenchloride.

.ABoilingpoint

t2

0%HpB

r00%Hp

MnOr- + 8H* + 5e- ) Mnz*+ 4H2OFe3*+d ) Fe2*

0EoHrOD

Boilingpoint

{S. \Arhichof the followingstatementsis not truefor a standardcellwhichconsistsof thetwohalf-cellsgivenbelow?

Ee=+1.52VEe=+0.77V

ABc

Thee.m.f.of the cellis 2.29VTheMnOr/Mn2*cellundergoesoxidation.Electronsflowfromtheelectrodein theMnOr'/Mn2*cellto the electrodein theFe3*/Fe2*cell.Concentrationof Fe3*(aq)ionsin theFe3*/Fe'*cellwillincrease.D


8/17

CONFIDENTIAL*16. tnthe constructionof cardiacpacemakers,it ispossibleto usea verysmallmagnesiumelectrodewhichcreatesan electricalcellwiththe inhaledoxygen.Therelevanthalf-cellsareasfollows.

Mg'** 2e) Mg E0= '2.38V1/zO2+2H*+ 2e) HzO E0 = +1.23Y

Understandardconditions,thecelle.m.fwouldbe 3.61V, butin the bodya potentialof 3.25Vis moreusual.Whatis the bestexplanationof thislowere'm.f?

A Thesmallsizeof themagnesiumelectrodeB Thelow concentrationof Mg2*ionssurroundingthemagnesiumelectrodeC Thehighresistanceof the bodyfluidssunoundingtheelectrodes.D ThepHbetween7 andI of the bodyfluidsunoundingthe electrodes.

17. Theenthalpychangefortworeactionsaregivenbythefollowingequations.2Fe(s)+ 3l"Oz(gl) FezOa(s); aH = - 822kJ mol-lC(s)+ %C,z/6,l) CO(g); AH= -110kJ mol-1

Whatis theenthalpychangeforthefollowingreaction?3C(s)+ Fe2O3(s)) 2Fe(s)+ 3CO(g)

A +712kJmo1'1B +492kJmo1-lC - 492kJmot-1D - 712kJ mol-1

iB. Whichvaluewouldbe requiredto estimatethe latticeenergyfor thehypotheticalioniccompound,MgH?

A TheelectronaffinitYof hYdrogenB Thefirstionisationenergyof hydrogenC Themagnesium-hydrogenbondenergyD Thestandardenthalpychangeof formationof MgHz

l4


9/17

t6CONFIDENTIAL*19. 4.0g of a hydrocarbonrequired16.0g of oxygenfor completecomb*ustionand9.0g ofwaterwasproducedin thereaction.Whatwasthemassof carbondioxideproduced?[Refativeatomicmassof 0=16,C=12,H=11A 4.09 B 9.0g

C 11.0g D 22.0g20. Thevaluesof pK6of severalsubstancearegivenbelow.

Substance PKuNHg 4.75CHsNHz 3.36cH3cH2NH2 3.27CsHsNHz 9.38

Whichof thefollowingis the strongestacid?A NHO* B CHSNHS*C CH3CH2NH3* D CeHsNHs"

21. Gonsiderthe sequenceof oxidesgivenbelow.Whichseriesshowsan increasingorderof meltingpoint?A ClzOz,AlzO.,SOs,SiOzB SOs,ClzOz,AlzOg,SiOzC SOg,ClzOz,SiO2,AlrO.D SiOz,AlzOg,ClzOz,SOs

22. Theprocessof chemicaletchingconsistsof partiallydissolvinga metalin a suitablesolvent.By carefulmaskingof themetal,it is possibleto producea patternin or on themetal.Whichof thefollowingaqueoussolutionscouldbe usedto etcha patternin aluminium?

A EthanoicacidB DilutenitricacidC SodiumhydroxideD Concentratednitricacid


10/17

CONFIDENTIAL*\Mrichof thefollowingstatementsregardinglead(lV)oxideis nottrue?A lt is amphotericB lt easilydecomposeswhenheatedC lt hasionicbondingwithcovalentcharacteristics.D lt is formedbyheatingstronglylead(ll)oxideinoxygen

24. \ /hichreactionof ammoniadoesnot involvethe non-bondingpairof electronson thenitrogenatom?

A NHs(g)+ GHsl(g)+ CHsNHg.l-(s)B NHs(g)+ HCI(g) --+ NHrCI(s)c 2NH3(l)+ 2Na(s) + 2NaNH2(s)+ H2(g)D 2NHg(aq)+ Ag.(aq) + [Ag(NHa)z].(aq)

25. P,Q, andR arethreeelementsin Group17.Q is a solidat roomtemperature.P-ionistheweakestreducingagentamongP-,Q- andR-

Whatis the arrangementof the elementsin increasingintensityof colour?A P,R,QB R,Q,PC P,Q,RD Q,R,PWhichofthe followingcomplexesdoesnot exhibitopticalisomerism?A [Cr(GzOr)z(HzO)zfB [Cr(CzOr)slLC lCo(en)zClz]D [Co(NHs)s(NOz)sl

27. Theintermediatespeciesformedin themechanismof the reactionbetweenmethaneandchlorineinthe presenceof lightis

A CHs* B Cr C CHCI3 D .CH2C|

l8


11/17

CONFIDENTIAL-ZB. When60cm3of a hydrocarbonwereburntcompletelyin oxygen,240cm3of carbondioxideand0.0125molofwaterwereproduced.Whatis themolecularformulaof-thehydrocarbon?(Ihe volumesof allgasesweremeasuredat roomconditions.Themolarvolumeof anygasat roomconditionsis 24.0dm3)

20

29. Whichtypeof isomerismis shownby eachof thefollowingorganiccompounds?

30. Whichoneof thefollowingcompoundshasthe highestpKuvalue?@*t, B @-*r,ruH,

ABcD

A CzH.C CgHs

c cH3-N-cH3ICHs

B CSH,D CoHro

A

3i. Lacticacidcan beformedfromethanolas shownin the rea-cti; schemebelow.sbDI *cpII stcPltr IcqcqoH: c4cHo5* Q-.*L - f" - c =oJ*.Namethe typesof reactionthat occurin stepI andstep lll.StepI

OxidationReductionCondensationDehydration

D ozN-@-ruHz

Stepll lHydrolysisEsterificationOxidationCondensation

ABcD


12/17

CONFIDENTIAL*32. Whichof thefollowingcompoundis formedwhenethanoylchlorideis reactedwith

22

HNcH2ococFr2-1 OCOCH.

Whichstatementis trueaboutcyclohexanone?A lt is an aromaticketone.B lts molecularformulais CeHrzO.C lt canbe oxidisedto benzoicacid.D lt willgivea precipitatewith2,4-dinitrophenylhydrazine.

34. Naturalrubberis a polymermadeup of isopreneunitswiththe structuralformulaCH2= C(CH3)CH= CHz.Whichof thefollowingis not trueaboutthis statement?

A TheIUPACnamefor isopreneis 2-methylbuta-1,3-dieneB Naturalrubberis madefromunsaturatedmoleculesC NaturalrubberbecomeshardwhenvulcanizedD Naturalrubberis a mixtureof cispolymersandtranspolymers

33. Thestructureof cyclohexanoneis shownbelow..-.an*


13/17

CONFIDENNAT35. X,Y andZ arethreedifferentcompounds.X reactswithsodiumto give offhydrogengas.X andY reactto forman ester.X andZ alsoreactto formthe sameesterbutat a muchslowerrate.CompoundY isprobably

A propan-1-olB propanaC propanoicacidD propanoylchloride

36. \Mich of thefollowingslatementsis incorrectregardingthecompoundbelow?cH3(oH)cHcH2cocH3

A lt willdecolouriseacidifiedpotassiummanganate(Vll).B lt canreactwithalkalineiodineto givea yellowprecipitate.C lt isopticallYactive.D lt willproducea brick-redprecipitatewithFehling'ssolution.

97. WhenX (agas)reactswithY,a mixtureofCHzBTCH2BTandCH2BTCH2OHareproduced.X andY areProbablY

A Ethene BrominewaterB Ethene SodiumbromidesolutionC HB(g) EtheneD Br2vapour Ethene

38. A compoundQ hasthefollowingcompositionby mass.Carbon,64.30/o;hydrogen,7.1o/aioxygen,28.6To.QreducesFehling'ssolutionto copper(l)oxide.0.1molQ reactswith4480cm3hydrogengasat s.t.p.withnickelas catalyst.Q is[Relativeatornicmass:H, 1;C, 12iO,16.1 molgasoccupies22.4dm3at s.t.p.lA CH2= CHCHC C CH3CH= CHCH= CHCHO

B CH= CCHzOH D CH3COCH= CHCH= CHOH

24

x


14/17

CONFIDENTIAL*39. An organiccompound,1,4/,is boiledwith aqueoussodiumhydroxideand the reactionmixtureis allowedto cool..Uponcooling,compoundX and compoundY (an alcohol)areproduced.On acidification,compoundX is convertedto compoundZ (CaH6O2).CompoundYgivesa positivetriiodomethane(iodoform)test.Compoundt4l is likelyto havethe structuralformula

A CftCH2COOCH3 'B CH3COOCHsc cHscH2coocH2cH3D CH3CH(OH)CH2COCI

40. Whichof thefollowingpairsof reactantsWillnot producethe compoundwiththestructuratformulashownbelow.

CHaI:-C-CHzCHsIOHA cH3cH2MgBr and )-cocn.

@-nase'CHsI andCH3CH2-C=O

c @aocHzcHs and cH3MgBrD 6\-cnrcHsMgBr and cH3cHo


15/17

CONFIDENNAL-SectionB

Foreachquestionin this section,one or moreof the threenumbercdstatemenfs1 to 3 may beconect.ThercsponsesA to D shouldbe selectedas follows:

41 The energy-leveldiagramfor a hydrogenatomshowsseveralelectronictransitionswithfrequenciesf1,f2,fs,fq andfs.

n=qon--4n=3n=2

n=l

Whichof the followingstatementsis/aretrueof the abovediagram?1. faandfsrplsentlinesin theBalmerseries.2. The linesrepresentedbyf1,f2andfgare non-visible.3. fsG?nbe usedto calculatethe ionisationenergyof hydrogen.Whichof thefollowingmixtureswouldproducea solutionof pH greaterthan7.1. 25 cm3of 1.0moldm-3NaOH(aq)and25 cm3of 1.0moldm4CH.COOH(aq).2. 25 cm3of 1.0motdm-3NHrCI(aq)and25 cm3of 1.0moldm NH.(aq).3. 25cm3of 1.0moldm{ NaOHand25 cm3of 1.0moldm4CH.COONa.

43. Whichof thefollowingcanbe determinedby usinga massspectrometer?1. The relativemolecularmassof an organiccompound2. Theaccuratemassof a nuclide(isotope)3. Theprotonnumberof an unidentifiedelement

28

42.

A B c D{ only

is conectI and2 onlyare correc't

2 and3 onlyare correct

1,2and3arecorrect-


16/17

CONFIDENTIAL"

A cellis representedby thecelldiagrambelow.c(s) ll Cf.(aq) ll Fe3*1aq1,Fe2*(aq)lp(t)\Arhichof thefollowingwillincreasethe e.m.fof the cell?

1 Increasethe concentrationof Cf*2 Decreasetheconcentrationof Fe2*3 tncreasethe concentrationof Fe3*

45. TheelementXhasa protonnumberof 25.Whichof thefollowingstatementsidaretrue ofX?

1 ThemetalXhasa highdensitY2 X formscolouredcomplexions3 Thehighestoxidationnumberof X in itsionis +7

Whichof thefollowingelement(s)has/havetheabovearangementof atomsin its1. diamond2. silicon3. boron

Whichof thefoltowingreagentsreact(s)withbothbenzeneandmethylbenzene?1 Chlorinegasin thepresenceof anhydrousaluminiumchloride2 Concentratedsulphuricacidon reflux3 Acidifiedpotassiummanganate(Vll)onreflux

30

46.

47.

A B c DI only

is correct1 and2 onlyare correct

2and3 onlyarecorrect

1,2and3are correct


17/17

CONFIDENTIAL-

48. cn =cu-@-cHgBrWhattype(s)of reactionwouldthe abovecompoundundergo?

1. Nucleophilicsubstitution2. Electrophilicaddition3. Freeradicalsubstitution

49. A compoundP decolourisebrominewateranddoesnotform a whiteprecipitatewithethanolicsilvernitratesolution.CompoundP is

1. / 92_CH=CHzcl

3. CHr=gggtr"'

Al"o-(u /\-r, cooHIOH

S0. \Mich of thefollowingstatementsis/aretrue regardingthe compoundabove?1. lt canformcondensationhomopolymer.2. lt canrotatetheplaneof plane-polarisedlight.3. 1 molof the compoundwouldreactwithsodiumto produce2 moles

of hydrogengas.

32A B c D

1 onlyis conect 1 and2 onlyare correct 2and3 onlyare correct 1,2and3are correct

stpm_trial_chem_09_eng_p1

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