STPM Trials 2009 Chemistry Paper 2 (Malacca)

8/3/2019 STPM Trials 2009 Chemistry Paper 2 (Malacca)

1/19

CONFIDENTIAL 2Section A [40 marks]

Answer aU questions in this section1. (a) The yellow gas, chlorine dioxide, CIOz, has been used for many years as flour-improving agent in bread-making. It can be made in the laboratory by the following reaction.2AgCI03(s) + Clz(g) , 2AgCI(s) + 2CI02(g) + Oz(g) = 0 kJ(i) Give the oxidation state ofCI in CIOz. [1 mark]....................t t ....................................................................... . ............... ... .(ii) Chlorine dioxide disproportionates to fonn a mixture of chlorate(III) and chlorate(V) ions inalkaline solution. Write a balanced equation to iIlusbate the reaction that occurs. [1 mark].. .?; Cl.9 .. j { . ~ B. ............ ........ ~ . ~ ...... ... !? ...... i .... ../. ..... . . ......(iii) Given that the standard enthalpies of fonnation ofAgCI03 and AgCI are -25 kJmort and-127 kJ mort respectively, calculate and comment on the value of the standard enthalpy offonnation of chlorine dioxide.- .

\

_zs4.;> A, CJ O.3(r)

--- -- Q--( j j . [4 marks]

( I ) - f ~ . @ -Ov'V-a/ Pa(J..c;.d ;01-0 C111 .l : l : l .

S ( j ; ) ~ ) * C 1 ? ( ~ ) + 01

O._-7>

-( ? C I O ~ - { ; ) ; > ~ - @ J(-15)-+ 0 - (-127)

c -+ I (:) 1 Ie J Vl-1o ( -,Comment: ..... ...... ........ ....... ~ f . \ . l . ~ . ~ ~ . ~ : ......... f.-f!. 0.(? rJ.; ...... . ................................................ .... .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .................................................................... .

(b) The standard electrode potentials of the following systems are given below:Systems EO / VCI02(aq) + 4H\aq) + 5e cr (aq) + 2H20(l) +1.50S(s) + 2W(aq) + 2e HzS(aq) +0.14

By using the standard electrode potentials given above, predict whether chlorine dioxide in anacidic solution reacts with aqueous hydrogen sulphide. Give your reasoning. [4 marks]L. i l 't l r r Cl07 \11.0) Jl'w.\.-{l f "sH'IYe (C \j o/u.e[.. LV - \ : ' 'c (aijo.()c;ll. - t" 4

-

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+'.50 - {+o,14)/+ ,,3, V /,

v ~ j H l Y )

,+ ~ " f . . , ~ u ; f ~ v < ~ J 0 t r ~ v 1 c 1 1 c""wh,le U"S v,11 ( ) y 1 ~ O

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CONFIDENTIAL*


2/19

CONFIDENTIAL 32. Part of the process by which coal can be converted into a combustible mixture of gasesinvolves passing steam over white hot coke.

H20(g) + C(s) H2(g) + CO(g) M1= +131 kJmorl(a) For the reaction above, write an expression for the equilibrium constant, Kp.p. [1 mark] .. ..."... f u ~ ~ . ~ ~ . . . . . . . . . . . . . . . . . . . . . . . . . . ......................................................... ((b) The system above is in equilibrium. State how the value ofKp and the equilibrium positionwould be affected when [6 marks](i) the pressure of the system is increased.. ....~ ~ r . \ \ ~ r . ~ ~ . ~ ... X ~ ~ (( .... ~ k ~ f - ! - .... 1 . ' ? ~ . ~ ..... ~ 0 . : ~ P . ' . ~ ~ ... ..... ( f ! ~ . . . . . . . . . . . . . ((ii) the tempemture is increased. T ~ ...~ \ . I ! . I : ? ~ ~ . ~ Yr. .... ~ ~ I J ~ ....!9 .. .7!:t ... . J': s : ! ~ . ! 0 . ~ . ~ ( . c ; .. f': f?.cf! ?!". ; . ::rt.lf: ........... .. $ h ~ . f , ~ .... - f . ~ .... ... ~ 1 ~ : t 1 f : ' _. Vr ... ~ ~ . ~ r . ~ . : . . . . . . . . . ............................ _... _. __ .... .(iii) some carbon is added to the system. 1-- y h'-' -

.... ~ U t k9 . ~ V . ~ ... shlifi .. .19 ... ~ r . ~ . ... -_. _p.. ... ; . I 1 . Y : . ~ - ~ ~ X e J ' : ... ___ ... _. _ ...... ____ . ___ '" __

(c) When steam was passed over coke at 700 c, at equilibrium, the partial pressure ofwatervapour was found to be 80 kPa and the equilibrium constant, Kp, was found to be 180 x 103 Pa.Calculate the equilibrium partial pressure ofhydrogen gas and carbon monoxide gas at 700C.[3 marks]u. ( ~ ) -f

l

/)

-+ C u) -:;:::"= ~ I Pl,j1 pco " J /.I) -:- ? (

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I QO x (0 ;; - "- - - - : :x (0 3~ I h ' f ( ~ ; : \' ~ ' + )C [0 10 l;Var

1 c-[ ;( ( !. ;;E) :- /. U- 4X lo 0'7t- x:. \-'1. i- \05

H


3/19

CONFIDENTIAL 43. (a). In the industrial preparation of aluminium from naturally occurring bauxite, thefollowing route is employed:

IMPURE NaOHBAUXITE

ALUMINIUM el

INSOLUBLE RESIDUE

SOLUBLEALUMINIUMCOMPOUND A

ELECTROLYTICMELT

added

D

INSOLUBLEALUMINIUMCOMPOUNDB

REFRACTORYCOMPOUNDC

i. Give the of each of the compounds A, B, C, and D.A: .......... ~ . \ ... ~ . ~ . ~ ~ . ~ ................ ..............................................................................................B: ......... ~ . 1 . W.H1.:. ..S. ~ 1 . : ? ) ..?:. ........................................................................................... .c: ..... ~ . \ ~ . ~ . ~ ~ ~ ~ ..........................................................................................................................D: ........ ( . % 9 . \ \ ~ . ~ ......... _........................................................................................................... .ii. What type of chemical bonding would you expect to be present in the reftactory compound

C? [5 marks].............. ~ ~ . ~ ~ ~ .... ~ r ) ~ t ~ ....................................................................................................... .(b). (i) Draw the structure and name the shape of he hydrated aluminium ion. [2 marks]

.-Structure: \A\f j/ \ ot

DI1

,

~ ~ f l = = ' ~ ~ ~ : ........... . ... . .... ..... . .. ..... ~ ~ . ~ ! : . ~ ~ . ~ ...........................................................

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4/19

CONFIDENTIAL 5ii. Write an equation to show the hydrolysis of the hydrated aluminium ion in water

............... ~ J . ( ~ ~ h .........i .... .~ : . ~ .............? ..... L ~ . ~ ~ ~ ~ ! . ~ . ~ .... .....--H . ................. ~ . ~ . ~ . l _ ~ ~ ~ ~ ....(c) Give one physical property of the aluminium metal and state one use of the metal related tothis property. [2 marks]

.::. ..... ~ . ~ .... ~ ~ ~ . ~ .... .... ~ ~ l ! 1 . ~ Use: ...................Q . ~ ... .. . ~ . ~ .. . .. y . e . ~ \ - ! . u ~ ...... ~ f ? ) ~ ....................................................................

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/


5/19

CONFIDENTIAL 64. (a) Write the structural formulae of the products fonned when the following compoundOH

I

reacts with(i) sodium metal

01./

c - c -0"1

(ii) sodium hydroxide solution 04

H '" iti I ICpj-( - c.: - OMI I IL./ WI J;1

[1 mark]

[1 mark]

(iii) ethanoic acid in the presence of concentrated sulphuric (VI) acid and wanned.

(iv) dilute nitric(V) acid

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[1 mark]

[1 mark]



6/19

CONFIDENTIAL 74. (b) Write the structural formulae of the following compounds.(i) P, CSHIOO, reacts with phosphorous(V) chloride to release white fumes ofHCI andforms iodoforlIl with alkaline iodine solution.(ii) Q, CSHIOO, reacts with phosphorous(V) chloride to release white fumes ofHCI andforIllS dicarboxylic acid when oxidised by acidified potassium manganate(VII) solution.(iii) R, C 4 H s ~ , which after hydrolysis with dilute acid, produces an alcohol which givesa positive iodoforIll test, and a carboxylic acid which can decolourise acidified potassiummanganate(VII) solution.(iv) S, C3H7NO, does not react with cold aqueous sodium hydroxide but liberatesammonia when the reaction mixture is heated.P 011 QI 40 \ c- (I,b I J I ., u-( 0 >-C'- 0\-\ ,

,R S1,I 11 Q 0 , II III'! - C C - 0- c -/1 \ _N -t1. ' ~ - L - C - ( I I /H J IlJ- C - ~ \...\ II11

[4 marks](c) o CHO

T u v ,/-Which of the the above compounds can be converted toOHIo >-CH2-C-COOH/ I

v / CH3(1) (ii) Write the structural forIllula of the intermediate compound.

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J.,.1 0 .f H\ 1 f.o (-C-c-/,J- \H

\ I

eN Y*This question paper is CONFIDENTIAL until the examination is over

[1 mark][1 mark]

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7/19

CONFIDENTIAL 8Section B [60 marks]

.Answer any four questions in this section.5. (a) Chlorine consists of two isotopes, 35CI and 37CI in the abundance ratio of 3: 1.Apart from the lines due to atomic ions, the mass spectrum of a chloride of phosphorus contains9 lines arranged in 3 groups. The sample consists only phosphorous-31.

Group mle valueA 66,68B . 101,103,105C 136,138,140,142(i) Give the fOlmula of the single ion responsible for the lines fOlllled in Group A, Group B andGroup C. [3 marks](ii) Give the fOllllula of the ion responsible for the lines formed at mle 136, 138, 140 and 142.

[4 marks](iii) Predict the abundance ratio of the various mle values shown in Group C. [2 marks](b) (i) Give two reasons why Xenon shows the greatest deviation from ideal behaviourcompared with other elements in Group 18. [2 marks](ii) State two conditions when real gases behave almost like ideal gases. [2 marks](iii) At a temperature of 300 K, 2.79 g of a mixture of gases occupies a volume of 1.00 dm 3 at apressure of 8.0 x 104 Pa. Calculate the average relative molecular mass of this mixture of gases.[2 marks]6. (a) A student on a field trip investigates some disused lead workings which have beenflooded for some time. The presence of lead(II) ions in the water is to be demonstrated byprecipitating yellow lead(IJ) iodide.(i) Write an expression for the solubility product oflead(II) iodide. [1 mark](ii) At 15C, the solubility product oflead(H) iodide is 4.0 x 10-9moedm-9 Find the solubility oflead(II) iodide in a 0.20 moldm-3solution of sodium iodide solution at the same temperature.[2 marks](iii) If an equal volume of the water from the flooded lead workings, and potassium iodide 'solution ofconcentration 4.0 x 10-3 mol dm-3, are mixed at 15C, determine the minimumconcentration of lead(II) ions which might be detected in the flood water. [2 marks](b) Trichloromethane (b.p = 61.2 0c) and propanone (b.p=56.4 0c) fOlll1S an azeotropic mixture.The azeotropic mixture has a boiling point of 64.7 c and contains 80% by mass oftrichloromethane(i) Explain why a mixture of trichloromethane-pro panone does not f01'1I1 an ideal solution[4 marks](ii) Sketch a vapour pressure-composition phase diagram for the trichloromethane-propanonesystem. [4 marks](iii) What is obtained when 20% by mass of trichloromethane is fractionally distilled ?

96212-This question paper is CONFIDENTIAL until the examination is over

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8/19

CONFIDENTIAL 97. (a). Explain how the following changes down Group 2 (beryllium to barium) of the

/Periodic Table. Write equations for the reactions involved.(i) Reactivity towards water(ii) Thellllal stability of he nitrates [3marks]

[5 marks](b) Some properties of two substances X and Yare given below. Identify each of thesesubstances and explain the chemistry of the reactions involved.(i) X is a colourless aqueous solution that leaves no residue on evaporation. It forIns ablue solid with an aqueous solution of copper(II) ions, and upon excess turns into a deep bluesolution. [4 marks]

(ii) Y is a compound ofGroup 14 elements, which exists as a colourless liquid at roomtemperature. It is stable to heat even at high temperatures. It reacts with water to fonn an acidicsolution. [3 marks]

8. (a). Why does cobalt show variable oxidation states? [3 marks](b) What do you understand by the tenn complex ion? [4 marks](c) A complex compound, triammminetrichlorocobalt(III) exists as two isomers.

( i) What is the chemical fOllllula of triammrninetrichlorocobalt(III)?

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[I mark](ii) Draw the structures of the two isomers and name them. State the type of isomerismshown.[5 marks]

(iii) Explain what happens when an aqueous solution of silver nitrate is added to anaqueous solution of triammrninetrichlorocobalt(III)[2 marks]

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9/19

CONFIDENTIAL 109. (a) Carbonyl compounds react with hydrogen cyanide to fonn cyanohydrins. Startingfrom a suitable carbonyl compound ofyour choice, and using a cyanohydrin as an intermediate,devise a 3-stage synthesis ofcompound B.

CompoundBSuggest reagents and conditions for each step, and draw the sb uctural formula ofeveryintermediate compound. [6 marks](b) Compound K, C4H1002, reacts with sodium metal but is insoluble in aqueous sodiumhydroxide. On treatment with hot acidified sodium dichromate(VI), K gives L, which is solublein aqueous sodium hydroxide. L can also be formed from fumaric acid, H02CCH=CHC02H, bytreatment with hydrogen over a nickel catalyst. Compounds K and L can be co-polymerised toproduce a polyester. Identify K and L and explain the above reactions. . [9 marks]

., 1'6. (a) The compound 4-ethylphenol, E, and chlorinated products derived from it have usefulantiseptic properties.-OH

EDepending on the conditions of the reaction, compound E can react with chlorine in twodifferent ways, giving the two isomers F and G. In these reactions chlorine reacts in a similarmanner to bromine.ICgHgChO ..

FII

E CgHgChOG

Compound F reacts with NaOH(aq)to give H, CgH1003, which immediately loses water to giveJ, C g H g ~ . Compound J is insoluble in water but it dissolves in NaOH(aq). It reacts with 2,4-dinitrophenylhydrazine and with alkaline aqueous iodine, but not with Fehling's solution.(i) Identify and draw the structural formulae of compounds F, H and J. Explain the reactionsdescribed and write equations where appropriate. [11 marks](ii) Suggest a structural formula for G. [1 mark](b) Describe one reaction which could be used to distinguish aniline from phenol.

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10/19

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11/19

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13/19

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14/19

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15/19

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17/19

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18/19

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