stpm trial chem 09 p12 ans johor

8/4/2019 Stpm Trial Chem 09 p12 Ans Johor

1/12

JABATANELAJAMN JOHORJA ur#r_ t JOHOR,IABATAN ELA,IARANOHOR,IABATAN'l;: e62 XY^{,1?#'rfr'Affi '1ff'?} ERGUBAANrPMooe#At ^-- 4RANoHoRJA uffiffi I JoHoAJABATANELAJAMN,ToHoRA ,ffi*gffi- { JOHOR ABATAN ELAJARANOHORABATANJABATANELAJARANoHoRJA ffuW, { JoHoRJABATANELA.IARANoHoR:J4B-AryyJABATAN7ELAJARANJoHoR JA 'ffiffiffi***' { JoHoR JABATAN PELAJARANJoHoR JABATAN,IABATANPELAJARAN OHOR JABATANPELA.IARAN OHORJABATANPELAJARAN OHOR.IABATANJABATANPELAJAMNJOHORJABATANPELAJARANOHORJABATANPELAJAK4N OHOR ABATANJABATANPELAJARANIOHOR ABATANPELA,]ARANOHOR,IABATAN ELAJARANOHOR ABATANTABATANELArAMy,t:),,cHEMrsrRyKlMrA,,7o\iYfrfrYr{,t\yr""Xt1:rffiXJABATAN ELAJARANOIJABATAN ELAJARANOHOR ABATANPELAJARANOHOR,IABATANELAJARANOHORIABATANJABATANPELAJAMN JOHORJABATANPELAJARANOHOR IABATANPELAJAMN ,IOHOR ABATANJABATANPELAJARANOHORJABATANPELAJARANOHORJABATANPELAJARANOHOR ABATANJABATANPELAJARANOHOR,IABATAN ELAJARANOHOR,]ABATAN ELA.IARANOHOR ABATANj)sii,arrr 7ELAJARAN oHoR JABATAN ELAJARAN oHoR JABATANPELAJARAN oHoR JABATANJABATANPELAJARANOHORJABATANPELAJARANIOHOR,IABATAN ELA,]ARANOHOR]ABATANJABATANPELAJARANOHORJABATANPELAJARANOHORJABATANPELAJARANOHOR ABATAN

JABATAN PELAJARAN JOHOR

SIJIL TINGGI PERSEKOLAHANMALAYSIA

MARK SGHEME(SKEMA PEMARKAHAN)f t laP /e 2


2/12

SGHEME APER1

lljI, i

1D2B3D4A5C6A7B8B9D10c11A12813C14C15D16D17818419c20D

21 C22C23D24C25A.26D27D28D29c30D31 A32D33D34D35D36D37438A39C40D

41 D42943B44C45D46847848D49450D

2


3/12

JADUALSPEFIKASITEM JSl)PEPERIKSAAN ERCUBAAN TPM2OO9NEGERI OHOR

No. I oprcQuestionNo. No .ofquestionseaS Moderate Difficult

I Mattter 1,46,43 2 42 Electronic tructure f Atoms 3,4,41 aJaJ Chemicalbondinq 5.6 24 Reaction inetics 7,8 z5 lonicEquilibria 9, 10,20,42 46 Chemical quilibria 11,12 z7 PhaseEquilibria 14 13 zI Electrochemistry 44,45 15 16 49 Thermochemistry 18 17 190 Period and Group2 21 1I Group 3 22 12 Group 4 23 1

aJ Group 5 24 14 Group 7 25 15 d-Block lements 26 16 Chemistry f Carbon 27,29 31,48 4Hydrocarbon 28,47 37 49 4

8 Haloalkanes 40 19 Alcohols ?A 38 z20 Carbonylompounds 32 ,33 39 J2l carboxvlic cids22 Carboxvlic cidsderivatives 35 123 Amines 30 124 Amides25 nitriles 5026 rminoacids27 rolymerisation 34 1

Totalno. of questions 15 27 8 50

3


4/12

Question1(a) i)

(1)(1)(1)

?

I(

(1)(1)(ii) (8X2X1/8) (6X2Xl

(b) (i) A set of temPeratureequilibrium.

(ii)

12\=g

and pressurevalueswheresolid,liquidand gas exist(1)

General ketchof graPh'Thecorrect xes.The abellings.

(i i i)becauseitstrip|epointoccursatapressureabovethenorma|atmospheric(1)pressure.

Tamparaturs /bC


5/12

(iv) PV=nRT@o' =#p = 5.50x 8.31x (24.0+273) x 10-3 kPa

10.0 10-3 44.0= 30'9kPa

Pt = 30.9+ 93.7 = 124'6kPa

(1)

(1)(1)

Total:10 marks

Question2(a)Ca2*(g+ 2e-+2Cl(g) This sthe onlyansweror he

op ine)Ca'*(g) 2e-+Clz(g)Ca. (g)+ e- + Clz g)Ca(g)+ Clz g) (state ymbols ndelectronsssential)Note:C|zto2C|canbeinanyorderbutCamustbeinsequence)Max.3marks

(b)Enthalpyofformat ion=178+590+1145+(2x121).(2x364)-2237= - 810kJmol-1(c)AH = -AH(latticeormation) EAH(hydration)(orcyclewithstatesymbols' umbers r abels)= 2237 1650 (2 x 364)= '141kJmol-1(d)Moles f NHaCI 2t53'5= 0'0374Heatabsorbed 15x 0'0374 0'561

Q=mcATLT = Q/m6'=0'561x1000)/(50x4'2)

2'6(oC)(allow .5 o 2.1)canuse52; gnore nits, nswermustbe at east2 sig igs)FinalemPerature2O 2'6 = 174oClnnr*"r is or20 - previous ns;mustbe < 20)

(1)(1)(1)(1)

(1)(1)(1)

(1)

(1)

(1)(1)

Note;maynotusemoles losesirst2 marks)so Af = (15x1000)/(50x4'2)Soanswers f71'4and68'7score ast2 outof irst4'trffo* no units or emperature'enalise rongunits)

{

Total:10 marks


6/12

Question3(a) 3s2 p1(b)(i)aluminiumydroxide

(ii)Ar(oH)4-(c) (i)whiteprecipitateEffervescence

(ii)Al(HzO)o3* + HzO+(d)(i ) AlCle CH3CI +

(ii) as ewis cid

electron-par accepto .(e) light

QuEstion4(a) (i) Ag*/silver

A!(H2O)5(OH)12.+ HsO*AlCl+- + CH:*

(1)(1)(1)(1)(1)(1)(1)(1)

InAlClg Alhasan incompletectetand accepts pairof electronsrom he Clatom n CHgCI@ Alcl3 san electron-def icientompound.ndactsas an

(1)(1)

Total= 10 marks

(ii) Carbonyl r C = O(iii) Helps o speedup the reaction/slowt room emperature/flammable(iv) Propanal:ilverminor ormed

Propanone:o change/solut ionemains olourless(b) i) opticalsomerism

(iiXa)

(1)(1)(1)(1)(1)(1)

(B)(1)

(1)(1)(1)

Total= {0 marks

Hill lNao-( O l-c -c_N_=H\ " / r l l

N^{- Ho H cH.

HHl lHo(O L-l -?--TH2*,or- *6 i Jr.(c) i)nucleophilicddition

(ii)dryether, oom emperature


7/12

Question(a) Lonepairdonated bothelectronsupplied yoneatom

fromN (toH.) [ignoremissing harge rhydrogen tom]dative/dativeovaent/coordnatebondng

(b) Vanderwaals ( or Vdw) forces etweenmethanemolecules(orVdW orcesnmethane)

Hydrogenondingn.ammoniandwaterHydrogenondsarestrongerhanvanderWaalsorces( orVdW orcesare heweakest)Hydrogenondsnwatermoreextensivehanammonia ecauseO has wo onepairs None) (1)[orWaterormsmoreH bondspermoleculethanammonia)](orH bondsn waterstronger ecauseO moreelectronegativehanN)(orH bondsnwaterstronger ecauseO - H bondmorepolar hanN- H)

(c) i)Thechangen concentrationerunitof ime (1)Bothaxesmustbe labetled o gainmarks orgraph.y axisconc NOzandx axis imeCurve tarts t origin nd evels ff.

(1)(1)(1)

(1)

(1)(1)

(1)(1)Note: f candidates raph doesnot eveloff then secondmarkcan be scored oracuwewitha continuouslyecreasing radient.

Initial atecanbe oundby indinghegradient t t = 0 (1)Note:Candidates ayscore hismark f theyhaveshown hison theirgraph(ii) 2SOz Oz 2SOs

NO s a catalystit s regeneratedttheendof thereactionprovidesnalternativeouteof lower ctivationnergy

(1)(1)(1)(1)

7Total= 15 marks


8/12

Question(a) i)A buffer olution as heabilityo resist hangesnpHwhena littleacidor base sadded (1)

whena littleacid sadded, t reactswithNHg' heacid s usedup'pH remainsunchanged

NHs + H*whenal i t t lebaseisadded, i t reactswi thoH- 'Thebaseisusedup'pHremainsunchanged

NHa* + OH-

(ii) POH 14.0 9'0= 5'0pOH PKu+ogffi

5.0= -logl 7x10-5log NHa.l0'10[NH+.] 0.17moldm-3

mass f NH+CIn450cm3= 0'17x53'5x 450 1000 4'1S

(b) (i)acidstrengthncreasesromno' 1 to no '3 ordown he ableoras number f Cl ncreasedue o theelectron-withdrawingffectorelectronegativityf chlorineatoms)stabilisinghe anionorweakeninghe O-HbondNOTH* moreavailable(ii)chlorine tom s urther way fromO-H) n no'4' so has ess nfluence(iii)either: H= PKa logroacid]= (4.9+ 2)= 3.4 allow .5)Note: [1]forcorrect xpression values;[1] or correctworking

(1)(1)

(1)(1)

(1)(1)

(1)(1)

(1)(1)(1)

(1)or Ka= 1Q PKa 1.259 10-3

[H.]= {(Ka'c)= 3'55x 1oapH= 3.4(1)(1)

rTotal= 15 marks


9/12

Question7(a) (i) ncrease (1)

(ii) Colourlessolutionurns o a brown olution/ lackppt(need othcolours) (1)Cl2+ 2Kl -) 12 2 KCI (1)Clz san oxidisinggent (1)(ii i) Addsilver itrate olution (1)' KBr ormscreamy pt (1)Kl orms ellow pt (1)AgNOg KBr + AgBr+ KNO. orAgNOg Kl -> Agl+ KNOg (1)

or onic quationsThenadd dilute r conc) mmonia (1)AgBr/ ream ptdissolvesnconcNH3 rslightly issolvesn diluteNHs (1)Agl s nsolublendilute r concNH3 (1)(b) SiCIo eacts/hydrolyses,Cltdoesnot (1)

[Thismustbe clearly tated ndnot ust mplied](lone) ai rof electronsfrom he oxygen tom) na watermolecule (1)cannotorma bondwith/be onatedo the C atomOr cannot e accepted y C atom (1)because hasnoavailable rbitalOR no 3d orbitals n CORC is a small tom'surroundedy Cl atomsORCl atoms re argeandsurround atom soattackssterically indered) (1)RejectsCCI+ as no d orbitals

Si has available)d orbitalsRejects iCl4 asavailable d orbitals (1)

(

q


10/12

Question8(a) whiteprecipitateormed or bariumnitrate

novisible hangeor magnesium itrate) BaSOaG) + 2HNOs(aq)@HzSO+(ag)+Ba(NOs\z-Ba2*(aq)+ SOa2-(aq) BaSO+(s)

(1)(b) ionicsizeof Mg2*' Ba2*magnitudef hydration nergyof Mg2* > Ba2* (1)ionicsizeof SOa2->sizeof cationsMg2* ndBa2*magnitude'ofatticeenergyor MgSOa lightlymore hanBasoe (1)

AHsolution AHnvdrationAHl"tti""(1)

ForMgSoa,AHsoution=Xothermic;ForBaSo+,AHsotution=endothermic;.(1)barium ulphate insolublenwater magnesiumulphate soluble (1)

(1)(1)

(1)(1)

(1)(1)

(c) i) (K"p=)Mgt-tt^ott1'unitsaremol3dm-e(ii)Let Mg(oFl)z(?.q)l[^M!tt] t'

KsP=2x10-11 4x3x= 1.71x 10a moldm-3' rcause fthecommononeffect(iii)ess ?Hb]":: ,*(aq)+ 2oH-(aq1smoved,totheeftor heequilibriumrag(oH)z(s)Mg'-(aq) zuil' (aq' (1)

(1)

Total= 15marks

to


11/12

Question 9(a) (i)

t cH.cH" IcH3cH2\ | "r - IHo-+ t-)-cr -> I "o-- / \ -" ' I " -H' lHHlL_l

(1)bimolecularucleophilicubstitution

CHgCHzCHzOH 18ooc

cH"cH","Ho-c-H +Cl-\ .H(1) (1)

(1)(1)(1)

(ii) rate ncreases.atomic izeof BPCI 'Hencehe c-Br bsnd sweakerand s easier o break hanG-Clbond

(iii) reflux 1) - lCHiCH2CFlzClNaOH(aq) (1)conc.HzSOa 1)

CH3CH= H2 + HCI -+ CHgCHCICHg(1)t3 E{TrH,N-f fi-T-f-cffiFIff{, o i{ cll2CItl per:atise:#CINH- ageinETITIH.N-C-ql.i-{-C(l0i{Ctlz0tt O H CHs prnalisepalvmer'bothtirnes

serylalaniner alanYlserine

flIEI3C-q-s-c+-ic-cooHi l l0 +rIIc-0Iffl*3

CH3CH= H2(1)

(b)(1)

(1)

(1)(i i)(iii)

(1)

t ( Total= 15 marks


12/12

Question10They'don'teactwithFehling's olution theyareketonesAandBgivesposit iveiodoformtest-theyhavethestructureCHgC=O ormethYlketoneIBoiling ointofA > B - A is lessbranched omparedo BA is CHgCOCHzCHzCHg

B is CHgCOCH(CHg)za,: CHgCHzCgCl-l2CHa

D andE gives 6 positiveestwith Fehlingls olution - theyafe ddehydes

D is optically ctive.Hence somers f D are

NO ^9H. !----'cH3cH2cHrC+rr'ftr-Q) - NO2+ rO

cHl. + cH3cH2cH2coo-

(1)(1)(1)(1)(1)

(2)(1)(1)(1)(3)

Reductionf E givesa longchain ompound'E is CHgCHzCHzCHzCHOF is CHgCHzCHzCHzCHzOHP is copper(l) xide (rejectCu2O)Examples f equations:

9H. Yi*r.cHrcHrb=o . HTNNHIO)-No, -->

CH.CH"II

I

- - ' / \ ,Hrct /CHO

-_--->AH.CH2CHTCOCHT+, + NaOHTotal= 15marks

stpm trial chem 09 p12 ans johor

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