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Greenish yellow gas
Gas berwarna kuning
kehijauan
Section A
[60 marks]
Answer all questions in this section.
1 Diagram 2 shows the apparatus set-up to investigate the electrolysis of 2.0 mol m-!
potassium chlorie solution. "reenish yellow gas #u##les is collecte at electroe $.
Diagram 2
%a& 'hat is meant #y electrolysis(
................................................................................................................................
................................................................................................................................
[) mark]
%#& 'rite the formulae for all ions that are present in potassium chlorie solution.
................................................................................................................................
[) mark]
%c& %i& *ame the gas collecte at electroe $.
.........................................................................................................................
[) mark]
%ii& 'hy is the gas prouce at electroe $. +,plain your answer in terms of
selective ischarge of ions.
.........................................................................................................................
.........................................................................................................................
[2 marks]
%& %i& Another gas prouce at electroe . 'rite the half equation for the
)
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Carbon electrode Y
Karbon elektrod Y
reaction at the electroe .
.........................................................................................................................
[) mark]
%ii& tate the o#servation at the electroe .
.........................................................................................................................
[) mark]
%iii& Descri#e a test to confirm the gas prouce at electroe .
.........................................................................................................................
.........................................................................................................................
[2 marks]
%e& /he e,periment is repeate with 0.000) mol m-! potassium chlorie solution.
At which electroe the prouct forme will #e ifferent(
................................................................................................................................
[) mark]
2. Diagram 2.) shows an aeroplane an a polystyrene cup.
Diagram 2.)
%a& %i& /he #oy of aeroplane is mae from uralumin. Aluminium is one of the
elements in uralumin. tate two other elements in uralumin.
.........................................................................................................................
[2 marks]
%ii& +,plain in terms of arrangement of atoms why uralumin is stronger an
2
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harer than pure aluminium.
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
[! marks]
%#& /he polystyrene cup is mae from a synthetic polymer polyphenylethene.
%i& tate the name of the monomer for polyphenylethene.
.........................................................................................................................
[) mark]
%ii& Diagram 2.2 shows the structural formula for the polyphenylethene.
Diagram 2.2
Draw the structural formula for the monomer of polyphenylethene.
[) mark]
%iii& 1t is avisa#le that we shoul not a hot foo or hot rinks to polystyrene.
+,plain why.
.........................................................................................................................
[) mark]
%iv& tate one reason why polystyrene cup shoul not #e ispose #y open
#urning(
.........................................................................................................................
[) mark]
!. +thanoic aci is a weak aci. Diagram ! shows a la#el of a reagent #ottle which
!
n634 634634634634634
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Potassi
Larutan
Carbon electrode X
Elektrod karbon X
A
containing ethanoic aci.
Diagram !
%a& 'hat is the meaning of aci(
..555555555555555555555555555555......
[) mark]
%#& +,plain why aci is a weak aci.
......555555555555555555555555555555....
[) mark]%c& 'hen a piece of magnesium strip is put into aci effervescence occurs.
'rite a #alance chemical equation for the reaction.
................................................................................................................................
[2 marks]
%& 24 cm! of 0.) mol m-! soium hyro,ie solution is put in a conical flask.
/hen a few rops of phenolphthalein are ae. /his solution is titrate with
0.) mol m-! solution .
%i& tate the type of reaction #etween soium hyro,ie solution an solution
.
........55..5555555555555555555555555....
[) mark]
%ii& 'hat is the colour change of the mi,ture at the en point(
..........................................................................................................................
.
[) mark]
%iii& 'rite a #alance chemical equation for the reaction occurs in %&.
........555555555555555555555555555......
[) mark]
%iv& alculate the volume of aci use.
[! marks]
7
u#stance 8 9rganic aci
oncentration 8 0.) mol m-!
:ormula 8 3!993
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7. Diagram 7 shows the flow chart of a series of reactions of copper%11& car#onate
salt.
Diagram 7
%a& opper%11& car#onate react with sulphuric aci to prouce salt L gas M an
water. "as M turns lime water chalky.
;ase on Diagram 7 ientify salt L an gas M.
alt < 8 ......................................................................................................
"as = 8 ......................................................................................................[2 marks]
%#& 'hen salt L solution is ae with soium hyro,ie solution a #lue
precipitate insolu#le in e,cess soium hyro,ie solution forme. *ame the
#lue precipitate.
................................................................................................................................
[) mark]
%c& alt < can #e converte #ack to copper%11& car#onate through reaction W.
%i& uggest a suita#le chemical su#stance that can #e use in reaction '
.........................................................................................................................
[) mark]
%ii& tate the name of reaction '.
.........................................................................................................................
[) mark]
%iii& ;ase on the answer in %c& %i& write a #alance chemical equation for the
reaction '.
.........................................................................................................................
[2 marks]
%& alt < is solu#le in water. ;riefly escri#e a metho to o#tain the crystal of salt
4
reaction W
opper%11& car#onate
> 3297
alt L > gas M > water
> *a93
;lue precipitate insolu#le in e,cess *a93
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< from its solution.
................................................................................................................................
................................................................................................................................
................................................................................................................................
[! marks]
%e& tate the colour of copper%11& car#onate crystal forme.
................................................................................................................................
[) mark]
4. Diagram 4 shows two e,periments to investigate one factor that influences therate of a reaction.
Diagram 4
%a& /he reaction in the e,periment is represente #y the following equation8
6
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a9! %s& > 23l %aq& al2 %aq& > 92 %g& > 329 %l&
%i& Among the proucts state in the equation which is the most suita#le to #e
chosen to etermine the rate of reaction(
.........................................................................................................................
[) mark]
%ii& tate one reason for choosing the prouct in 6%#&%i&.
.........................................................................................................................
[) mark]
%c& /he results for #oth e,periments are represente #y "raph 6.
;ase on "raph 68%i& ompare the rate of reaction #etween e,periment 1 an e,periment 11.
.........................................................................................................................
[) mark]
%ii& 'hat has happene to the reactants at time ,(
.........................................................................................................................
[) mark]
%iii& 'hy are #oth curves at the same level after time ,(
.........................................................................................................................[) mark]
%iv& +,plain your answer in %c& %i& #y using the collision theory.
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
.........................................................................................................................
[! marks]%& tate another factor that can affect the rate of reaction for the e,periments.
?
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+ Acidifed potassium manganate!""#
Butan-1-ol
Compound BButanoic acid
Process $
................................................................................................................................
[) mark]
%e& Another e,periment is carrie out using e,cess calcium car#onate power an
ilute hyrochloric aci with ifferent concentrations. ketch the curve of
concentration of ilute hyrochloric aci against time taken to collect a fi,equantity of the prouct.
[) mark]
6. Diagram 6 shows a reaction scheme for an organic compoun.
Diagram 6
%a& %i& *ame process @.
.........................................................................................................................
[) mark]
%ii& Draw a la#ele iagram for the set-up of apparatus to carry out process @.
But-1-ene
@rocess @
> ethanoic aci
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[2 marks]
%iii& Draw the structural formula of #ut-)-ene that forme in process @.
[) mark]
%#& %i& tate one o#servation uring process .
........................................................................................................................
[) mark]
%ii& 'rite a #alance chemical equation for the reaction in @rocess .
.........................................................................................................................
[2 marks]
%c& 1n another reaction a mi,ture of #utan-)-ol ethanoic aci an concentrate
sulphuric aci are heate gently to prouce compoun ;.
%i& *ame compoun ;
.........................................................................................................................
[) mark]
%ii& Draw the structural formula of compoun ;.
[) mark]
%iii& tate one physical property of compoun ;.
.........................................................................................................................
[) mark]
Section B [20 marks]
B
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Answer all the question from this section.
?. Diagram ?.) shows the flow map for inustrial manufacture of sulphuric aci.
Diagram ?.)
%a& *ame the process of manufacturing sulphuric aci in inustry.
'rite a #alance chemical equation for step $ an step .
[4 marks]
%#& Diagram ?.2 shows the steps to prouce fertiliCers $ from the reaction #etween
sulphuric aci an the prouct of 3a#er @rocess.
%i& 'rite the chemical formula of fertiliCers $.
[) mark]
%ii& A farmer foun that the crops in his farm is infertile. 3is frien suggeste
two fertiliCers to improve the fertility of the soil urea 9%*32&2 anfertiliCers $.
hoose the #est fertiliCer for the growth of the plants. +,plain your
answer.
[elative atomic mass8 E)2 9E)6 *E)7 E!2 3E)]
[7 marks]
%c& /a#le ?.) shows five ifferent manufacture su#stances in inustry @ an / an their uses.
)0
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Manufactured substances in
industry
Uses
@ /o make #oats an #aminton racket
/o make meals an statues
/o make the #oy of aeroplanes
/o make artificial teeth an #ones
/ /o make cooking ware an #oiling tu#e
Table 7.1
;ase on /a#le ?.) state the names of @ an /.
"ive the specific properties of each su#stances to support your answer.
[)0 marks]
Section C [20 marks]
))
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Answer any one question from this section in this section.
. %a& A stuent has carrie out an e,periment to construct an ionic equation for the
formation of lea %11& ioie. even test tu#es of the same siCe were
la#elle ) to ?. A fi,e volume of 4.0 cm! of ).0 mol m-! potassium
ioie solution was poure in each test tu#e. /he volume of ).0 mol m -!
lea%11& nitrate solution that ae is shown in /a#le . /he height of
precipitate forme in each test tu#e was measure. /he results are shown
in /a#le .
Test tube 1 2 ! 7 4 6 ?
Volue of 1.! old-"
lead#$$% nitrate solution & c"0.4 ).0 ).4 2.0 2.4 !.0 !.4
'ei()t of *reci*itate &c ).) 2.2 !.7 7.7 4.4 4.4 4.4
/a#le
%i& ;ase on /a#le plot a graph of the height of precipitate against volume of
lea %11& nitrate solution at page )4.
[! marks]
%ii& Determine the num#er of moles of lea %11& ions an ioie ions that are
require for the formation of lea %11& ioie. our answer shoul consist of
the following8
• /he volume of lea %11& nitrate solution that ha reacte completely with4.0 cm! of ).0 mol m-! potassium ioie
• alcFlate the num#er of moles of lea%11& ions an ioie ions
• alculate the num#er of moles of ioie ions that has reacte with ) mol
of lea%11& ions.
• 'rite the ionic equation for the formation of lea%11& ioie.
[? marks]
%c& Diagram )0.! shows three reagent #ottles which contain nitric aci soium
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hyro,ie solution an soium nitrate solution.
/he la#el in each reagent #ottle which contains the three colourless aqueous
solution respectively has etache.Descri#e how you carry out chemical test to verify each aqueous solution
without using any inicator. our escription must inclue o#servations an
conclusion.
[)0 marks]
B. %a& /he ta#le #elow shows the results of a test to ifferentiate #etween propanean propene.
)!
+a,' +a+,"'+,"
Diagram )0.!
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rocedure ,bseration
;romine water is ae to
propene
;rown colour is ecolourise
;romine water is ae to
propane
;rown colour oes not change
;ase on the ta#le a#ove e,plain why there is a ifference in these
o#servations.
'rite a #alance chemical equation for the reaction occure.
[4 marks]
%#& Diagram B shows structural formulae of four organic compouns.
All four organic compouns A ; an D are colourless liquis at room
temperature.
ompoun A ompoun ;
ompoun ompoun D
Diagram B
%i& *ame the homologous series of compouns A ; an D.
[7 marks]
%ii& Another compoun + is in the same homologous series as compoun .
'rite the molecular formula for compoun + which has five car#on atoms.
[) mark]
%iii& Descri#e #riefly a chemical test to ifferentiate #etween
• ompoun A an compoun ;
• ompoun an compoun D
1n your answer inclue a #alance chemical equation for the reaction involve in
your chemical tests.
[)0 marks]
"raph of the height of precipitate against volume of lea%11& nitrate solution
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)4
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)6
