STPM Trial Chem 09 Eng P2

8/4/2019 STPM Trial Chem 09 Eng P2

1/17

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S|JILTINGGIPERSEKoLAHANMALAYSIA

Instructions o candidates:Answer ll thequestionsn SectionA in thespacesrovided' Allworkin{iust be lri*i. For numericalanswers, nit mustbequotedwhereverheYareaPProPriate'Answeranyfourquestionsfrom ectionB. For thissection,writeyou, on*rn, on niliit, sheeti.Begineachansweronafreshsheet"if i*u andarrangeyour answersn numericalorder.Tieyour answersheetso thisbooklet.Anrwersmaybewritten n eitherEnglishor Malay'A DataBooldetsProvided'

ForExaminer's se(Untukkegunaanpemeriksa)

This questionpaperconsists f 3$ printed pages'STPM 96212*This questionpapers coNFTDENTTAL until theexaminations over. CONFIDENTIAL*


2/17

1.

CONFIDENTIAL* 2SectionA [40 marks]

Answer ll thequestionsn this section.(a) lodine,12, rystallizesn a face-centred ubic attice.

(i ) Drawa unitcellfor he odine rystalattice. [1 mark]

(ii) Calculatehe number f odine tomsnoneunitcell. [1 mark]

(b)The riplepointof carbondioxides at -57oC nd 5 kPa,while ts critical ointisat 31oC nd73 kPa.

(i) Define riplepoint. [1mark]


3/17

CONFIDENTIAL*(ii) Sketchhephase iagram f carbon ioxide asedon the nformationabove. [3 marks]

(iii)Based nyourdiagramn b(ii), xplain hysolid arbon ioxide ublimestroom emperature. [1mark]

(iv)A pieceof solidcarbon ioxidewitha massof 5.50g is placedn a 10.0dm3vesselhatalready ontains irat 93.7kPaand24.0oC. fter hecarbon ioxidehas otalfy aporized,alculatehe otalpressuren thecontainer t24.0oC.

[3 marks]


4/17

CONFIDENTIAT2, Considerhe ncomplete orn-Haberycleand he ableof databelow.

(a)Completehe Born-Haberycleabovebywritingheappropriatehemicalformulae, ithstatesymbols, n hedottedines. [3 marks]

Ca'*(g)+ 2Cl-(g)

StandardenthalPY hange Valueof enthalpY hange/kJmol-rEnthalpyf atomizationf chlorine +121Enthalpyfatomizationfcalcium +178Firstonizationnergyof calcium +590Secondonizationnergy fcalcium +1145Electron ffinitY f chlorine -364Lattice nergy f calcium hloride -2237


5/17

CONFIDENTIAT(b) Use he cycleand the valuesgiven n the table o calculate he standardenthalpy f formation f calcium hloride' [2 marks]

(c)Thestandard nthalpiesf hydrationf theCa2* nd heCl- onsare 1650kJmol-1 nd 364 kJ mol-1espectively.se his nformationnddata rom he able npart a) o calculateheenthalpy fsolution fcalcium hloride' [2 marks]

(d) Thestandardnthalpyfsolution farnmoniumhloride, H+CI,s+15 Jmol-1.

A 2.0g sample fammoniumhloridesdissolvedn50 g ofwater'Bothsubstancesre nitiallYt20 C.

calculatehe emperaturehange nd he inal ernperaturef thesolution'Assumehat hespecific eatcapacity f thesolutions 4'2JK-tg-t'

[3 marksj


6/17

CONFIDENTIAL*3. Aluminiums he irstelemeni fGroup 3 n hePeriodicable.

(a) State hevalence lectroniconfigurationf aluminium [1 mark]

(b)Whenaqueous odium ydroxides added9 anaqueous olution faluminiumhloride, whiteprecipitate,, s formed. hisprecipitateissolvesnex@ss odium ydroxide,orming n on,Q.

(i) Name heprecipitate . [1markl

10

(ii) What s the ormula f onQ ? [1 mark]

(c) An aqueousolution f aluminiumalt s acidic.(i) Describe hatyouwouldobserve henaqueous odium arbonates

addedo aqueous luminiumhloride. [2marks]

(ii) Writean onicequationor hereactionn (c) [1 mark]


7/17

CONFIDENTIAT 12(d) Aluminiumhloride anbe usedas a catalystn FriedalCraftsalkylationfbenzene.

(i ) Writeanequationor he eactionetweenluminiumhloridendchloromethaneo formanelectrophile. [1 mark]

(ii) Useyourunderstandingf acidsandbaseso explainheroleofaluminiumhloriden thereaction bove' [2 marks]

(e) Stateoneproperty hichenables luminiumo be used n overhead lectriccables. [1 mark]


8/17

CONFIDENTIAL-4. (a) Thediagram howshow odistinguishetween ropanal ndpropanone'

Ttrll*n'srcngnt+pmpanalonpttlF'Eons

(i)State hemetal onpresentnTollen'seagent'

t4

thrsr

.[1markl

(ii)state he unctionalroup resentn bothpropanalndpropanone'

[1mark](iii)Explain hyhotwaters used'

[1mark](iv)statewhat s observednseparate xperiments ithpropanal ndpropanone.Propanal.. [1mark]Propanone. [1 mark]


9/17

CONFIDENTIAL* 16(b) Adrenalineishormonehatactsas a stimulant.t has he structuralormulashown elow.

/:\ Io_\(J r-c^r *f I-T-T--*H CHt(i) State he ypeof isomerismhatcanexist n the adrenaline olecule.t1 markl

(ii) Draw hestructuralormula f theproductormedwhenadrenalineeactswith

NaOH 1"q1 DiluteHCIStructuralformula Structuralormula

[2 marks]


10/17

CONFIDENTIAL- 18(cl Adrenalinen besynthesizedromX via he ollowing leps:

HCN LiAII{4rr-($*to - )PHO'

(X) steP1 steP2-)p )Q -+ adrenal ine

(i) State hetypeof reactionhat s involvednstep1 t1 markl

(ii) State hecondition(s)equiredorstep2. [1markl


11/17

CONFIDENTIAT 20SectionB t60 marksl

Answeranytourquestionsn thissection.

E.(a) The equation elowshows heq-agtion etween'ammonianda hydrogenion.

NH3+}f--rNHr*, , In tegnsof the,etedrsnenv.o[vqd,xplain owthe.bondbe$rveen,theHg

molecule nd he H* ions sformed,Name hetypeof bond ormedn thisreaction. [3 marks]

(b) Boiling ointdata or hreehydrides regivennthe ablebelow.

Hydride Relativemolecularmass,Mt BoilingpoinUoCMethane 16 -182Ammonia 17 -33

Water 18 100

Explain hy hese hreehydrides aveverydifferent oiling oints.[4marks]


12/17

CONFIDENTIAL-(c) (i)A reaction f nitrogenmonoxides shownbelow.

2NO(g) Oz(g)-' 2NOz(g)The ateof reaction anbe oundby measuringhe concentrationf NOz

at differentimes.Definehe termrateof reaction.Sketch grapho showhow heconcentrationf NOz hanges ith ime.Indicate ow he nitial ateof reactionouldbe obtainedromyourgraph.

[4 marks](ii) n hemanufacturef sulphurrioxideromsulphur ioxide, itrogenmonoxidean be used n a two-stage rocesso increasehe rateofproduction.

2NO(g) Oz(g)* 2NOz(9)NOz(g) SOz(g)-*NO(g) SOr(9)

Constructnoverall quationor heproductionf SOs romSOz.State ndexplainully he oleof NO n hisprocess.

[4 marks]


13/17

CONFIDENTIAL- 246. (a) (i) Using solution fammoniumhloridendammonias example,xplain

what s meantby a buffersolutian. [5marks](ii) Calculatehemassof ammoniumhloridehatneeds o be added o450

cm3 f 0.10moldm-3 mmoniaoproduce solution ithpH= 9.0I Kuof NH3 1.7x 10-5moldm-3 t4marksl

(b)ThepK"valuesof fourcarboxyliccidsare istedn the ablebelow.

Acid Formula f acid plG1 CHsCHzCOOH 4.92. CHsCHCICOzH 2.83 CHsCCIzCOOH 1.44 CHzCICHzCOOH 4.1

(i ) Describendexplainhe rendn acidic trengthhown y acids1,2 and3.

(ii) Giveanexplanationor hedifferencenthepKavaluesor acids2 and4.

(iii)CalculatehepHof a 0.010moldm-3 olution f propanoiccid acid ).

[6 marks]


14/17

CONFIDENTIAL-7. (a) (i) State he rend n the reducing bility f the halide ons rom luorideo

iodide.[1mark]

(ii) Statewhatyouwouldobserve henchlorine ater eactswithasolutionf potassiumodide.Writeanequationor he reaction.State heroleof chlorinen thereaction.

[3 marks]

(iii)Givea reagent hich ould e usedo'distinguishetweeneparatesolutionsfpotassiumromide ndpotassiumodide. tatewhatwould eobserved hen his reagents added o eachof the separate olutions fpotassiumromide ndpotassiumodide.Writean equationorone of hereactions.

ldentify reagentwhich ouldbe addedo themixturesrom he irst estto confirmhe dentity f thehalideons.Statewhatwould e observedneach ase.

[6 marks](b) Carbonetrachloridendsiliconetrachlorideehaven ditferent ayswhenaddedowater.Statehoweach hlorideehavesndexplainhedifference.

[5 marks]


15/17

CONFIDENTIAL-g. (a)An aqueous olution f magnesiumitrate ndbarium itrate anbe

differentiatedy headditlon f dilute ulphuriccid.Statewhatyouwouldobserve hen heabove eactions carried ut.[3 marks]

(b)Compare ndexplainhe solubilitynwater,or he solidsulphatesormedn8(a). [7marks]

(c) Thesolubility roduct, "o, fmagnesiumydroxideasa numericalalueof2.0x 10-11.

(i)Writean expressionor heK"oofmagnesiumydroxide,tatingtsunits.(ii)Use hevalueof K"o iven o calculatehe concentrationf Mg(OH)zn asaturatedolution.(iii)Explain hethermagnesiumydroxideould e more oluble r esssolublen 0.1moldm-3MgSO+(aq)han nwater.

[5 marks]


16/17

CONFIDENTIATg. (a)(i) Write hemechanismf thereaction hen1-chloropropanes refluxed ith

aqueousodium ydroxide.ame f the ypeof reactionnvolved [3 marks]

(ii) State ndexplain ow he ateof his eactionhanges hen1-chloropropanesreplacedy 1-bromopropane' [3 marks]

(iii)writeequationso showhowyouwould hange1-chloropropaneo2-chloropropane [5marks]

(b) Theamino cidsalaninendserine reshown elow'HIHzN--C-COOHICHralanine

HIHzN-C-COOHIcH2oHserine(i) Draw hestructures f the wo dipeptidesormedbythe reaction falaninewithsenne.(ii) Name neof thedipeptidesormednb(i)'

(iii)Drawhestructuref heorganicompoundormedwhenonemoleculeof serineeactswith womoleculesfethanoyl hloride. [4marks]


17/17

GONFIDENTIAT

{0. Five rganicompounds,to E, has hemolecularormula sHroO.Compounds, B andC can eactwith2,4-dinitrophenylhydrazine,utnotwithFehling'solution. nlyA andB gives positiveodoformest.A hasa higherboiling ointhanB.

CompoundsandE givea brick edprecipitate,, withFehling'solution.D is optically ctive.Reductionf E givesa straight haincompound, '

Based nthe nformationbove,dentify ompounds to F. Give easonsforyour hoice.

Name omPound.Writeany hreechemical quationsor hereactionsbove,nvolving

differenteagents.[15marks]

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STPM Trial Chem 09 Eng P2