stpm trials 2009 chemistry paper 2 kelantan

8/3/2019 STPM Trials 2009 Chemistry Paper 2 Kelantan

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962/2JABATAN PELAJARAN KELANTAN

JALAN DOKTOR, 15000 KOTA BHARU.TRIAL EXAMINATlON2009CHEMISTRY (KIMlA)

SIJIL TlNGGI PERSEKOLAHAN MALAYSIA(MALAYSIA HIGHER SCHOOL EDUCATION)PAPER 2 (KERTAS 2)

Two aod I bllf bour (Duo jam . . . .ngab )DO NOT OPEN TlDS BOOKLET UNTIL YOU TOLD TO DO SO

Arahan kepada calon :Jawab $(!JfUlII soaJan da/am &ltaglllif A d%m l'1Iong yang disl!diaJtan.Setnua ierja mesliJd ditunj uU(l'1. Bag; jawapan MrangAa. unitmrstllah dinyolakon manu-mana yang suuoi.Jawab mono-mana myHIt Soa/on daripada Bda,l i I l I B. Unlukbohogian in f, ,ulis jawopon andu poda he/aian Jawupon yangdibellI/ion. Mllldkansellap jawapan poda helalan k "'m yang baru.dan StlSun jawapan anJa mettgiiul tl!Nib berongk4 /lealMlo ianJ(m'apon ando busama bub soo/an in i.Jowapan b o I ~ d/lulis do/am hohaso Mclayu DUJU bahasa 'nggerls.BuA" D{I(a dlbela/Um.Instructions to candidates :Anmer .u he quut/OU In St/o" A in Ihe spaces provided. AllO f ' k ,"lUI be s/JQwn. FiX numer ical ( ~ ' e n units IffJIst quoted

Vo'hUffVU they (ll 'e approprlUlLAn,wv anyfo,,, quesliOlU from Section IJ. For Ihis section, wr /le youranswers on Ihe answer shuts provided Begin eoclr on afre3hsheet ofpafWr, and arrange your QtJ.nI.crs in numerical ordu. TieYO III'atJ.nl.'t'I" sheets to Ihu booAlel,Answers may be y.'rinen In eillwr Malay or English.A Doto lJoojjet isprovided

Untuk kegunaanpemcriksa( For examiner 's use12J -+56,89 +10

Jumlabl..m>t!!llThis question paper consists of 13 printed pages(KertaJ sollan iui ferdin dllnpada 13 hal.man bercetak)


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CONFIDENTIAL 2SECTION A [40 mar .

Answer all qlltrtinn.


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CONFIDENTIAL 3

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(ii) If the ratio of chlorine-35 10 chJorine-37 is 3: I and bromine-7910 bromine-81 isI : I calculate the relative abundance of the peaks. [3marks]

mle Relative abundance154

156

158

b) Phosphorus is an element of group 15. PhosphOrus react W1ln Chlonne to lormphosphorus trich loride, PCI, and phosphorus pcntachloride, PCI ,.(i) Write the electronic configuration afthe phosphorus atom.

[I mark]

.................... ................ .. ... ......... ...................... ... ....... ...... .....(ii) Stale the typc ofhybridisalion in PCI, and PCI,

[I mark]

(iii) Suggestwbethcr nitrogen will form a pcllthachloridc, Nels. Explain youranswer. [2mark]

.. ....... ...... ..... .... ... .. ...... ... ...... .. ... ................ ........................... 0 0

.... 0000 .. .. . ...... ........ ..... . ...... . .. . . .. ............... .. .................... 0 .. . .. . .

...... ........................................... ......................... ..................... ..............................CONFIDENTIAL

This question paper is CONFIDENTIAL until the examioaljon is over.


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CONFIDENTIAL 42. The decomposition ofbydrogcn peroxide is a fir.Jl order reaction.

2H,o, (oq) - 2H,O (I) + 0 , (g)(8) Explain what is meant by order o/reaction ? [2marks]

. .. ... -........ ... ..................... . ............... .......... .... ...... ............. ... .. ....... . . . . . . . . . . . . . . . . .

(b) Write the rate equation for the decomposition of hydrogen peroxide. (1 mark)

(c) The rate constant for the reaction at 298K is 3.42 x mol d r SO (i) Calculate the rate of decomposition of hydrogen iX'iOKide when the concentrationis 1.25 x 10-' mol dro- [1 mark]

:ii) is the rate ofproduction of oxygen at the same instant ? [1 mark]

(iii) Calculate the half-life of the reaction . [2 marks]

962f2 CONFIDENTIALThis question paper is CONFIDENTIAL until the examination is over.


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CO NFlDENTIAL 5c) Sketch a graph to show the variation of the concentration ofhydrogen peroxide

with time. You may assume that the initial concentrationofhydrogen peroxideis t .Omol dm .

[31

96212 CONfIDENTIAL*This question paper is CONFIDENTJAL Wltil the examination is over.


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CONF IDENTIAL 6

3. An important use of silicon compounds is to make glass. The simp lest fonn ofglass is soda glass which is produced by melting silica (Sio,), sodium carbonateand calc ium carbonate at about 1800 K.

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(a) Name a subslance which can be added to soda glass in order to(i) increase its melting point. [I mark]

(ii) give a coloured product. [I rom]................ ... .... ............... ..... ...... ... ....... ..... .... .. ........ .. ......... ..

(b) Give a difference in terms ofbonding and structure between glass and ioniccrystal. [2marlcsJ... ....................... .. ............ ... ..... .......... .... ... ... ....... .. ...... .. ............ .. .... ... . . . . . . .... . . . . .... . .

(c) Group 14 clements can react with chlorine to fonn a tetrachloride.i) In the following table, give the name of the process (if any) and the

equation of the reaction which occurs.

[4marlcs]ii) Explain the differences of the reaction between the three tetrachlorides abovewith water [2marks]

..... ..... .... ........ ............ ............ .. .. ... .... ... .... .......... .. ... .. .... ..... ... .. ........ ...... ... ........ ..... ................... ...... .......... .... .... ................. ......

CONFIDENTIALThis question paper is CONF IDENTIAL until the examination is over.


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CONFIDENTIAL 7

..l . or8MUc compouud x: of1ll0h'U" U l a ~ ~ o f 136.9g I UO r l h.n\ tbe followingc O l u l ' o ~ i t i o u by 1l1:l'So'So:I I(AI Dctenni'1C' rhe lnolec\llt1 r foron'lf! ofX .

l 2: w."u'ks ](b \Vbcu X is boiled under n::flux with aqueous ,,"odium hydroxide. 2.mcthyl l prop :''lUol is formed .( i ) DJ'OW the su 'ucnu'nl fOl"llluln of X

( u ) Srmc the meCh:lul'illl of th e I'cnetion. . .. . ... ,. ...... . . . .. ..... . ... ...... ...... _.. .... ..... ..... . ..... ......

96212 CONFIDENTIAL-This Question paper is CONFIDENTIAL until the examination is over.


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CONFIDENTIAL 8

(c, \,"hen X i i lI'c:afcd with:m olc:oholic ioluriou o f sodium hycboxide . :\11 olkcuc Yi i fonncd . Y 1"C,'Ch with h Y c U o ~ c n bromide to tOl"Ul Z which i i 111 io;OOlCf of X

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( i) Y h.u tOUl' i . o m e ~ Give: the \tt''Ucfiu-ol fOrlnuln fOI" the i",oJ\lcr thatexhibih ilcom,ctric:d is.omcTiwl

( u) Dl":1w tbe 'iotJ"\lcmrRI tOJ"1\lu!n for Z

( ii i) 5!r:nc oue i'JOlUer of Alkene Y th..."If produce\. c.:uWu dIOXide wbeu healedwith couccutnuc:d acidified Ja.JuO.;':' Qj,c 3l } equation for the 1 ~ . 1 C f I l ]somt>I""

\d) Z renct\. with .1que-om \odilUU hydroX1de 10 fOl'll1 AU alcohol PSU,i:g:cst (1 .. uuple chClmC31 Ie . ' 10 diifcl'cnri :nc Ixtwccn 31cohol P2-lllcthyl. J-pl'op:mol

.. .... ... ... . . - . , . . . . . . . . .. . .. . . . .. . ... . . .. ... ..... .. .. .. ....... ... .. ... ....... ................ .. ... .. .... .. ... ... . ..... . .

.. .... . .. .... ....... ........ ... .... ...... .... .... ...... .. ...... ....... .. .

CONFIDENTIALThis question paper is CONFlDENTIAL until the examination is over.


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CONFIDENTIAL 9SECfION B [60 marko]

Answer any four queslions in this section.5(0) The boiling points and solubilities ofammonia, hydrogen chloride and carbondioxide gases are given in the table below.

Relative Molecular Boiling Solubility inGas Formula pointl'C waterMass, M, I mol drn'Ammonia NH, 17.0 -33 18Hydrogen HCI 36.5 -85 23chlorideCarbon CO 2 44.0 -78 0.033dioxide

(i) Explain the variation in the boiling points and solubilities of the gases relating tobonding. [5 marks](ii) Ammonia dissolves in water to produce ammonium ion. Draw the Lewis structureand predict the shape of ammonium ion. [3 marksJ

(b) A galvanic cell consists ofa zinc electrode and a hydrogen electrode as shown in thed.iagram below;& voltmetere

PI(+) A-. eLOa Sait bridge.. , Zn(-)

- - --------H' (aq) :: ~ J ~ L : : : ~ : : ----------------- ZnSO .(i.Omol drn-' )

at 298 K------------- . - . - - - - - - - - - ---------------------- - - - - - - - - - - ----

In experiment. the emf of the cell is found to be +0 .54 V at 25C. The pressure of thehydrogen gas is 1.0 atm and the concentration of zinc sulphate is l.O mol dm J

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(i) Calculate the concentration of the W ion in the hydrogen halfcell. [5 marks](ii) What is the effect on the emfof the cellcell is increased ? if the pH of the acid in the hydrogen half[2 marksJ

CONFIDENTIAL-This question paper is CONFIDENTIAL until the exam ination is over.


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CONFlDENTW. II

7. (a) Define the standard fonnation and lattice energy of sodium chloride crysta1line.[4 marks]

(b) The possible fluorides formed by an clement M are MF and MF,EntbaplyofatomisationofM = +284.6 kJmor'First ionization energy orM = +731.0 kJmor 'Second ionization energy orM =- +2073 kJmor'Enthaply ofatomisation ofF = +79.0 kJmor'Electron affmity ofF = -322 .0 kJmor'Lattice fonnalioD energy ofMF .. kJmor'Lattice formation energy of MF l D -2260 kJmor l

Using the data above,(i) Draw a Born-Haber cycle for the ronnatioD ofMF.(ii) Calculate the enthalpy of formation ofMF .

[6 marks)[2 marks]

(iii) If the enthalpy of formation ofMF, is + 342.6kJmor', which compoundwill most probably be formed when M reacts with F. [3 marks)

8. (3) What ismeant by a transition clement? [I mark]

(b) Transition clement complexes are often coloured whereas compounds ofothermeWs are usually white . For example , a solution of [ C u ( H 2 0 complex ion isblue but a solut ion of [Cueh]" complex ion is colourless. Explain theseobservations in terms of electronic configurations. [5 marks]

(c) (i) Carbon, silicon, germanium, tin and lead are elements in Group 14 of the PeriodicTable . Describe the variation in acidbasc character of their oxides.

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[5 marks](ii) Lead (TV) oxide is a dark-brown solid. When lead (IV) oxide is healed with anaqueous so lution ofa manganese ( II) salt in the presence of excess nitric (V) acid, thereaction that takes place is as follows.

2Mn' + 4H+ + 5PbO, - 2MnO' + 5Pb>+ + 2H,OExplain how lead (IV) oxide reacts. and state what is observed .

[4 marks)

CONFIDENTIAL*This question paper is CONFIDENTIAL until the examination is over.


12/13

CONFIDENTIAL 129 Give an explanation for the foUowing observations to identify the compounds orG, J, K.L.Mand N and write the cbemicaJ equation involved.

(a) The chlorine atom in compound G (C,H,cI) can be replaced readily as a result ofreacljon with dilute aqueous sodium hydroxide. However. the chlorine atom in isomer Jis not affected by the above reaction. [5 marks]

(b) If oompound K (C.H,N) is """ted first with bromine and then ethanoyl chloride ,oompound L (C.HoBr;NO) is obtained. IfK is treated firsl with ethanoyl cbloride and thenfollowed by bromine, oompound M (CaH.BrNO) is the product. [5 marks](c) Compound N (c..HIOO). can exist as a pair of optical isomers and reacts withphosphorous pcnlachloride to give hydrogen chloride. [5 marks]

10. The amino acid tyrosine, lysine and glycine are constituents ofmany proteins.0I

H,N C,.. C 0"I 0IIC H ~ C- 1 ,N -CH -C - OH II(YH,) H,N Oi C _ 011,,

11NH2OHtymsine lysine glycine

a) State the reagents and conditions you could use to break proteins down into amino acids.[2marks]

b) Draw a nnR around each chiraJ centre in the above molecuJes.[2 marks]

c) In aqueous solution amino acids exist as zwiuerions. Draw the zwitteronic structure ofglycine.

[I mark]

96212 CONFIDENTIALThis question paper is CONFIDENTIAL until the examination is over.


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CONFIDENTIAL 13

d) For each of the following reactions, draw the structure oftbe organic compound fonned.(i) glycine + excess NaOH(aq).(ii) tyrosine + excess NaOH(aq)(iii) lysine + excess HCI(aq)(iV) tyrosine + excess Br,(aq) [5marksl

e) Draw the structuml formula of a tripeptide formed from aU three of these ruTtino acids,showing clearly peptide bonds.

[2 marks)I) The formula ofpan of chain of a synthetic polyamide is shown below.

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(i) Identify the repeat unit of polymer by drawing square brackets around iton the above formula .

(ii)' Draw the structure of two monomers from which the polymer couJd bemade.

(iii) Name the type ofpolymeri7.ation of po lym er shown above.[3 marks]

stpm trials 2009 chemistry paper 2 kelantan

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