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MAJLIS PENGETUA SEKOLAH MALAYSIA
CAWANGAN PULAU PINANG
_. .., - --~- ----"' - , .. -- ·. -- - /" ... _ ...... _, __ -.,_ - --·· ··-· - .... -···
· SKEMA JAWAPAN
MODUL LATIHAN BERFOKUS
SPM 2014
KIM lA KERT AS 1
4541/1
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2
JAWAPAN KIMIA KERTAS 1
1 B 11 B 21 c 31 D 41 D
2 c 12 B 22 A 32 c 42 c
3 c 13 A 23 c 33 A 43 D
4 B 14 B 24 A 34 B 44 B
5 D 15 c 25 D 35 A 45 A
6 D 16 B 26 c 36 A 46 c
7 c 17 A . 27 A 37 c 47 D
8 D 1a D 28 B 38 B 48 D . ~ -- .. . - - . ---/ ·-- -- -
j;f ..
D 19 A 29 c 39 B 49 D
10 A 20 A 30 B 40 c 50 B ..
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. .
MAJLIS PENGETUA SEKOLAH MALAYSIA
CAWANGAN PULAU PINANG
SKEMA JAWAPAN
---- -------/ -- --MODUL-lATIHAN BERFOKUS
__ .SPM 2014
KIMIA KERTAS 2·
4541/2
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Bromine vapour consists_of and discrete molecules/particles. Bromine molecules/psl;tic;;les move randomly from the bottom gas jar (highly concentrated) to 'tile 'top jar (less concentrated). to the between the air 1 3
1 (b) (i)
1. Shape of curve 1 2. Mark of the m 1 2
(ii)
~- . . ./ .,· ·-. -· - .
1 1
(iii) 1 1 2
Total 10
as. 2 2 (b) turns brown
at the end of the combustion tube 2 2 (c)
Cu 0 Mass 3.20 0.80 1
· Number of moles (mol) 3.20 0.80 ' 64 • . -16 -=0.05 = 0.05 1
1 1 Em irical formula CuO 1 3
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2 (d)
3 (b)
(i} (ii}
CuO + Mg -7 Cu + MgO From the equation, 1 mol CuO react completely with 1 mol Mg. 0.05 mol CuO react completely with 0.05 mol Mg. Total mass Mg needed is= 0.05 x 24
= 1.2 g
Group 1 -has one valence electron Period 4 - has four shells filled with electrons.
· Atom X donates one electron Atom Y accepts one electron
-
. .,..-· .. __ ,..._. ..... -.- ... .,.... .... -..- ------ --- •. -...-------···-.··-- ..... -- . , ~ .,.,..---~------__.,- ·- .• --
1. Correct electron arrangement with nucleus shown 2. Correct ratio of atoms and charges
(ii) Electrostatic force
move freely
1
1
1
Total
1
1 1
1 1
1 1
1
1
1
2
10
1
2
2
2
1
1
: . "J..::'~JHJI" ··H.;l •; .lw:H.:j, t_;; _ .J( ~lf ... Jt
'~:.:. L'J •.: rrl' ··' l; ':
4 (a) 2 NaE>H··+H2S04 --. Na2SE>:.' ·+·2Hk0
1. CorreCt formula of reactants and products 2. Balanced equation
,.,·
1 1 2
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4 (b) 5.00 cm3 1 1
4 (c) MaYa _ _1_
MbVb - 2
0.5 x5 _j_ Mbx25 - 2 1
Mb = 0.2 mol dm-3 1 2
4 (e) (i) 10 cm3 II Double the volume of sulphuric acid 1 Nitric acid is monoprotic acid II Sulphuric acid is diprotic acid 1 2
(il) Add 2 :cm3 of dilute sulphuric acid and 2 cm3 of iron( II) sulphate 1 solution into the test tube and shal<e the mixture. Carefully add a few drops of concentrated sulphuric acid to the side 1 of the test tube. Brown ring is formed. 1 3
Total 10
5 (b) NumbeF of moles, of 0.3/24 = 0.0125 mol 1 mol Mg produces 1 mol H2 1 So 0.0125'mOI Mg produces 0.0125 mol H2 Volume of H2 gas at room condition= 0.0125 x24 = 0.3 dm3
1 2
5 (c) (I) Expf:!riment I =0.3 g /60s =0.005 g s·1 1 1
(ii) Experiment II =0.3 g /30s =0.01 g s·1 1 1
5 (d) Experiment II has higher rate reaction than 1
[of 1 energyofpartlcleirls 1
Frequency of collision between magnesium atom and hydrogen ion 1 is higher in Experiment II. Frequency of effective collision also increases In Experiment II. 1 3
max
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5 (e) Volume of gaslcm3
E 1 1
. .
. Timels
Total 10
1 1
: NickeVNi II Platinum/Pt 1 Temperature: 180 °C 1 2
·~~c) C~l:l-4: +. 1-:hQ.. -+ . . C..2t!sOH. 1 - 1/ ;. '
! ... (ii)
l I I H-C- C-C-OH
I I I H H H 1
H H H I I I
H- C-C-C -H I I I H OHH 1 2
6 (d) (i) Polythene I Polyethene 1 1
Make plastic bags I bOttles I chairs I toys 1 1
Produces poisonous I toxic gases which can cause 1 1
0
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·-r.,.;;;;;;.".;;~ ,,- :"· · '[ ; - -- - · • · . ·, - l.-.,;L..:i• C' i' - · · '~'.,j;, '· cc ·' ., : ~jijJ:9)r,, , ,, ; .; , _ · , lll.WIL~ ,~o>q(;l;. :1_~.. ~").ill.! :lt,ol~i·
, l~.ls1 · :. i: J~•IDJt:~ 4Mir.~ ' ... _.·-~_ ....... ~ ~~~ I . - -~---- --- ~---- -~-~~: -~ 7 (a) (i) Negative terminal : zinc 1
positive terminal : copper 1 2
(ii) 1. Zinc electrode becomes thinner 1
2. Oxidation 1 2
7 (b) 1. Voltmeter reading decreases 1
2. Iron is lower than zinc in the electrochemical series II Iron is less electropositive than zinc II Distanqe b~tw~en ir~n anq copper i$ shorter than distance betWeen zinc and copper in the electrochemical series 1 2
7 (c) 1. S - Concentration of the ions 1
2. R - Position of ions in the electrochemical series 1 2
7 (d) 1. Ions present in solution: Na + I Cf I H+ I OH- 1 2. Ions attracted to electrode R: Na+ I W 1
3. Ions attracted to electrode s : cr I OH- 1
.. 4-. Name oflon diScharged' atelecttoae R: Hydtogen ion 1
5. Name of ion discharged at electr(>de S : Chloride ion 1
6. At electrode R1 H+ ion is selectively discharged because W ion is 1 + . placed lower than Na ion in the electrochemical· series.
7. At electrode Sl cr ion is discharged because concentration of cr 1 ion is higher than OH-ion.
8. R : Colourless gas bubbles released 1
9. S : Greenish yellow gas 1
10&11. R: 2H++ 2e·-+ H2 1+1
12&13. S: 2cr-. Cl2 + 2e· 1+1 12
max
Total 20
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[:12/~r_;r_.,"Jlrzi" : 1! .. -- ·- - -- iMhtt.~ .~.&r=1~-il~ - - ' ~.!!12· ';~j91hi;
f l~i~· ' ', !\!L~~i. ll~~Jjj_~ i I . . l --~ - -- - ·- • • - ----- -- --• • -- - ~I 8 (a)
8 (b)
8 (c)
8 (c)
Reaction A - not a redox reaction Reaction 8 - redox reaction Reaction A: No change in oxidation number
Reaction 8: Oxidation number of zinc changes/increases from 0 to +2 II
Oxidation number of copper changes/decreases from +2 to 0
(i) Compound P : + 2 , iron(ll) chloride Compound a : + 3, iron(lll) chloride
(ii)
(i)
(ii)
Bromine water [Any suitable oxidising agent] Green solution turns brown II Brown colour of bromine water is decolourised [Any suitable observation for related oxidising agent used] Substance which releases/ donates electrons //Iron( II) ions release electrons · Electron flows from electrode a to electrode P through .external ~i~c_uit/ connectingv~ir~s _ . ___ /' / ·~-
Observation
1 1
1
1
1+1 1+1
1 1
1
1
• Galvanometer needle deflects 1 • Purple colour of acidified potassium manganate(VII) solution 1
decolourises • The green colour of iron(ll} sulphate solution turns brown
(any two) Half equation at P:
Mn04" + 8H+ + se· ~ Mn2• + 4H20
Half equation at a:
Fe 2+ ~ Fe3• + e·
Ionic equation:
5Fe2• + Mno4· (aq) + aH• ~ Mn2• + 4H20 + 5Fe3•
At P : reduction reaction
·Ara : oxidation reaction
1
1
1+1
1
1
4
4
2
1
9 Total 20
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: ~}_,l~i]!JF1) : ···:, C 1 t~1r.,)j~~ ;~ch::Jf'l~- -·~,h i• -~:,:1~l~ ' ,, ' , •' .. ~
···:r · ' ''r-J ;~ · ll'1t:v~ :
9 (a)
9 (b)
9 (c)
l 'l j
Type· of food additive X - Preservative Example - salt/ sugar/ vinegar/ sodium nitrate/ sodium nitrite/
benzoic acid/ sodium benzoate Type of food additive Y - Flavouring Example - monosodium glutamate/ aspartame/ salt/ sugar/ vinegar
(i) Ali - Aspirin Raju - Antidepressant
(ii) Precaution: Tak~ ,after food II Swallowed with plenty of water Explanation: Acidic and can cause stomach irritation II To avoid Internal bleeding
(iii) 1. Drowsiness 2. Respiratory difficulties 3. Poor coordination 4. Llght-headedness
[any two] Materials: Soap solution, detergen solution, 1 mol drn"3 magnesium sulphate solution/ hard water, cloth with oily stains
· Apparatus : ..500 em~ beaker, 500.cm3 measuring-cylinder
Procedure:
1 1
1 1 1 1
1
1
2
1
. 1
1. [250-400] cm3 of magnesium sulphate solution (hard water) Is 1 poJ,Jred Into two beakers labelled X and Y respectively. .
2. [20-50] cm3 of soap is poured Into beaker X and [20-50] cm3 1 deterg~nt is poured into beaker Y.
3. A small piece of cloth with oily stains is dipped Into each beaker 1 4. Each cloth is washed with the soap or detergent In each beaker. 1 5. The cleansing action of the soap and detergent Is observed and 1
recorded.
Observations :
Beaker Observation X Oily stains remain y Oily stains disappear
Conclusion :
The cleansing action of a detergent Is more effective than soap In hard-water · - ·-- --- -
1 1
1
4
2
2
2
10
Total 20
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10 (a) (i) ..
1. Correct formula of reactants and products 2. Balanced equation
(ii)
1. Axes with label energy and two levels ·2: Correct-position of reactants; products and AH
(iii) 1. Heat of combustion of butanol is higher than propanol. 2. The molecular size/number of carbon atoms per molecule of
butanol is bigger/higher than propanol. 3. Butanol produces more carbon dioxide and water molecules than
propanol/ release more heat energy
10 (b) Diagram: 1. Functional diagram 2. Labelled diagram
1 1
1 1 .
1
1
1
1 1
2
· 2
3
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Procedure: ---
1. [1 00 - 200] cm3 of water is measured and poured into a copper 1 can and the copper can is placed on a tripod stand.
2. The initial temperature of the water is measureo and recorded. 1 3. A spirit lamp with butanol is weighed and the mass is recorded. 1 4. The lamp is then placed under the copper can and the wick of the 1
lamp is lighted up immediately. 5. The water in the can is stirred continuously until the temperature
of the water increases by about 30 °C. 1
6. The flame is put off and the highest temperature reached by the 1 water is recorded.
7. The lamp and the content is weighed and the mass is recorded. 1
Calculation:
• The highest temperature of water = 12 The initial temperature of water = t1 1 Increase in temperature, 6 = t2- t1 = e
• Mass of !amp before burning = m1 Mass of lamp after burning = m2 1 Mass of butanol burnt, m = m1-m2 =m
• -- Nt:fmberof moles of' butanol: C4H90H, n '= m - --., ' . ' . '
. 74 1
• The heat energy released = mass of water x c x e = y J 1
• Heat of combustion = ~ J mol"1 n 1
A grecaution steg:
• The flame from the burning of alcohol must touch the base of the copper can
• A windshield is used to shield/ protect the flame from air currents /wind
• The water in the copper can must be stirred continuously throughout the experiment to ensure the temperature of the water 1 Is uniform
• The spirit lamp must be weighed immediately because alcohol evaporates easily
[any one]
.. -- . ... ·- ······· .· . .. -1-3 ---max
Total 20
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. --·- · / .· .- . . - . ..-· -~ -·· .. ··
MAJLIS PENGET~A SEKOLAH MALAYSIA CAWANGAN PULAU PINANG
SKEMA JAWAPAN
-- MODUL LATIHAN-BERFOKUS
SPM 2014
KIMIA KERTAS 3
4541/3
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2
JAWAPAN KIMIA KERTAS 3
Question Mark Scheme Marks 1(a) Able to record the all the observations and inferences accurately. 6
Samole answer: Test ObseNation Inference tube
A Pink spot/ colouration lron(ll) I Fez+ ions are not formed II Iron does not rust/ corrode
B High intensity of dark blue - lron(ll) I Fe~+ ions formed spot/ colouration II More dark quickly// Iron rusted/ blue spot formed corroded quickly
II Iron rusts quickly
c Low intensity of dark blue Jron(ll) I Fez+ ions formed spot/ colouration II Less dark slowly// Iron rusted/ blue spot formed corroded slowly
II Iron rusts slowly
D Very low intensity of dark blue lron(ll) I Fe~"' ions formed spot/ colouration II Least dark very slow// Iron rusted/
-- blue spotJormed- - _ "- - .corroded very slow _ - . -
II Iron rusts very slow
Able to record any 5 of the observations or inferences accurately. 5
Able to record any 4 of the observations or inferences accurately. 4
Able to record any 3 of the observations or· inferences accurately. 3
Able to record any 2 of the observations or inferences accurately. 2
Able to record any 1 of the observation or inference accurately. 1
No response or wrong response 0
Question Mark Scheme Marks 1(b) - Abie to expiain a difference in observation correctly between test tube 3
A and test tube B
Sample answer: - Iron ifftest tube A does not rusv· CcirroC:Iel -oxidise oecause iron is In
contact/coiled with zinc which is more electropositive metal than iron, but iron in test tube B rusts/ corrodes/ oxidises because iron is in contact/coiled with copper which is Jess electropositive metal than iron.
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3
Able to explain a difference in observation between test tube A and 2 test tube 8 incompletely.
Sample answer: In test tube A, zinc is more electropositive than iron and in test tube 8, copper is less electropositive than iron.
Able to state any idea of difference in observation. 1
Sample answer: Iron/ Ferum/ Fe/ naiV metal does not rust/ corrode/ oxidise II Iron/ Ferum /Fe /nail/metal rusts/ corrodes/ oxidizes II Zinc is more electropositive II Copper is less electropositive
No response or wrong response 0
Question Mark Scheme Marks 1(c) Able to state the relationship between the manipulated variable and 3
the responding variable with direction correctly.
Sample answer: 1. When a more-electropositive metal is in contact/coiled with iron,
- the me.tal inhibits_ rusting I corrosiortof .iron II vice versa - - ·- --- ,. - . .-.-
2. If the metal in contact/coiled with iron is higher than iron in the electrochemical series, the rusting I corrosion of iron is prevented II vice versa
Able to state the relationship between the manipulated variable and 2 the responding variable with direction but /ass accurately.
Sample answers: 1. When a more electropositive metal is used, the metal inhibits
rusting I corrosion of iron II vice versa
2. If the metal is higher in the electrochemical series, the rusting I corrosion of iron is slower II vice versa
3. The rusting of iron is prevented if a more electropositive metal is used II vice versa
Able to give an idea of hypothesis. 1
Sample answers: . ... . - -·-·· - · -· · - .,. :· -Iron rusts when iii eonlacf with other metals
·-·
2. Other metals affect the rusting of iron
No response or wrong response 0
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4
, . Question Mark Scheme M~uks 1 (d) .. Able to state all variables correctly: 3
Samgle answer: Manipulated variable: Type of metal in contact/coiled with iron Responding variable: Rusting II Presence of blue spot/colouration Fixed variable: Type of nail I/ iron If medium in which the iron
nails are kept
. '· ·. Able to state any two variables correctly. 2 Able to state any one variable correctly. 1 No response or wrong response 0
Question Mark Scheme Marks 1(e) Able to state the relationship between the intensity of blue colour and 3
the rate ofrusting of iron accurately:
SamQie answer: The higher the intensity of blue colour, the higher the rate of rusting of iron II vice versa
Able to state the relationship but Jess accurately: 2
- -· ... ~- - ,. , - . SamQie answer: - . . ··· - .._ .. ~ .. - ----- -~ _,.... . -,- -- ..... .- .
Different intensity of blue colour, different rate of rusting.
Able to state an idea of relationship: ·1
' •
SamQie answer: The intensity of blue colour affects the rate of rusting.
No response or wrong response 0
Question Mark Scheme Marks 1(f) Able to name the ion that causes blue spot and write a correct half 3
equation for the fonnation of the ion:
Sample answer: 1. lron(ll)'lon
2. Fe - Fe2+ + 2e
Able to name the ion that causes blue spot and write an almost correct 2 .. ·- - . . . .. half equation for the. fonnation of the ion: . ·- ·- . .. . .
SamQie answer: 1. lron(ll) ion
2. Fe - Fe2+ + e
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5
Able to state the ion that causes blue spot or an idea of writing half 1 equation:
Sample answer:
1. Fe2+
2. Fe2+ + e ~ Fe
No response or wrong response 0
Question Mark Scheme Marks 1 (g) Able to arrange all the 4 metals correctly based on descending order 3
of electropositivity.
Sample answer: Zinc, Iron, metal X, Copper
Able to arrange only 3 metals corractly based on descending order of 2 electropositivity.
Able to arrange at /east 2 metals correctly based on descending order 1 of electropositivity or able to arrange all the metals correctly but in ascending order of electropositivity
--- ·' - ~ -... ~---- .. .. --- ···--···· --- __, ,- -·· --- -' - .. ·-·' - -- -· _ _ _,.. -- · -- J' --.
-No response or wrong response 0
Question Mark Scheme Marks 1 (h) Able to define operationally the rusting of iron accurately containing all 3
these 3 criteria:
1. Rusting of iron is the formation of dark blue spot I colouration
2. When iron nail is coiled I in contact with a less electropositive metal I meta/located below iron in electrochemical serie_s
3. Immersed I dipped I placed I put in a mixture of jelly solution containing potassium hexacyanoferrate(/11).
Sample answer: When iron nail is coiled with a less electropositive metal immersed in jelly solution containing potassium hexacyanoferrate(lll), dark blue spot I colouration is formed
Able to define operationally the rusting of iron less accurately 2 containing all these 2 criteria:
--· - ·. .. ~ . - . -- . . - . . ·- --.-. -·- . - ~
1. Rusting of iron is the formation of blue spot I co/ouration
2. When iron nail is coiled I in contact with a less electropositive metal I meta/located below iron in electrochemical series.
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6
Sample answer: When iron nail is coiled with less electropositive metal, dark blue spot I colouration is formed.
Able to state an idea of operational definition containing any one of 1 these criteria:
1. Rusting of iiun is the formation of blue spot I colouration 2. When iron nail is coiled I in contact with a less electropositive metal
I meta/located below iron in electrochemical series.
Sample answer: 1. Iron nail coiled with less electropositive metal 2. Rusting occurs wheri dark blue spot I colouration is formed
No response or wrong response 0
Question Mark Scheme Marks 1(i) Able to classify the metals into metal that can provide sacrificial 3
protection and metal that cannot provide sacrificial protection correctly.
Sample answer:
_, ... M~~! t~a..t ~ar1 PJQYit!_~ _ . .IYI~~I ~~atcarm..ot provide .. sacrificial protection sacrificial protection
Zinc Metal X Copper
Able to classify any two metals correctly. 2
Able to classify any one metal correctly. 1
No response or wrong response 0
Question Mark Scheme Marks 1(j) Able to predict the obseNation accurately. 3
Sample answer: The Intensity of dark blue spot lcolouration is very high II higher than test tube B.
A.bl~ to predict tht:J Qb..serv~tion/ess accurately. 2
Sample answer: Blue spot /colouration is formed.
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7
Able to state an idea of observation. 1
Sample answer: The test tube/ jelly turns blue.
No response or wrong response 0
Question Mark Scheme Marks 2(a) Able to state the problem statement accurately. 3
Sample answer: How does the solubility of sodium chloride and naphthalene in water and in propanone differ?
Able to state the problem statement but less accurately. 2
Sample answer: How is the solubility of ionic and covalent compounds in water?
Able to give an idea of statement of the problem. 1
Sample answer: Is ionic I covalent compound soluble in water?
' -· ~ . ... ... · No response or wrong_ res(:>onse - --' -· / · - ·- . - _. , .,. ~ - 0 ---
Question Mark Scheme Marks 2(b) Able to state all the variables correctly. 3
,.
Sample answer:
Manipulated variable: Type of solvent II Water and propanone
Responding variable: Solubility of compound in solvent
Fixed variable: Amount of sodium chloride and naphthalene
Able to state any two variables correctly. 2 Able to state any one variable correctly. 1 Noresponseorwrongresponse 0
Question Mark Scheme Marks 2(c) Able to state the relationship between the manipulated variable and 3
.. the responding variable with direction correctly; - - -- ... -- ·-
Sample answer: Sodium chloride is soluble in water but insoluble in propanone whereas naphthalene is insoluble in water but soluble in propanone.
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8
Able to state the relationship between the manipulated variable and 2 the responding variable but less accuraiely.
Sample answer: Ionic compound is soluble in water but insoluble in organic solvent whereas covalent compound is insoluble in water but soluble in organic solvent.
Able to state ari idea of hypothesis. 1
Sample answer: Sodium chloride is soluble in water II Sodium chloride is insoluble in propanone II Acetamide is insoluble in water II Naphthalene is soluble in propanone.
No response or wrong response 0 •
Question Mark Scheme Marks 2(d) Able to give a complete list of materials and apparatus that involves the 3
following:
Sample answer: Water, propanone, sodium chloride, naphthalene, test tubes, spatula
- - -· - -· . ---- - ~ -· - ~ · ~ ... / " ·/ · -- ·- -· . ... ..... --------- ... -- , - . -- - .... ,..·. --·
Able to give a list of materials and apparatus that if!VOives the following 2 but less accurately.
Sample answer: Water, propanone, sodium chloride, naphthalene, test tube/ spatula
Able to give an idea of the materials and apparatus that involves the 1 following:
Sample answer: Water/ Propanone, Sodium chloride/ Naphthalene, Test tube/ Spatula
No response or wrong response 0
Question Mark Scheme Marks 2(e) Able to state all the following 5 steps correctly: 3
Sample answer: 1. Put a [<:Juarter/ half of] sp~t~_la of ~odi~m chlo_ri~~ a~d ~~hthalene ..
ilito two separate test tubes:---- ·· -2. Pour [2-5] cm3 of distilled water into the test tubes. 3. Stopper the test tubes and shake well. 4. Record the observations. 5. Repeat steps 1 to 4 by using propanone to replace distilled water.
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Question 2(f)
9
Steps 1, 2, 4, 5
Steps 1, 2, 4
No response or wrong response
Mark Scheme Able to exhibit the tabulation of data that includes the following information:
1. Heading for manipulated variable : Type of solvent II Solvent 2. Heading for responding variable : Solubility of compound 3. 3 x 3 table
Sample answer:
Type of solvent
Distilled water Propanone
Solubility of sodium chloride
Solubility of naphthalene
Able to exhibit the tabulation of data that includes the following -infotfiiatiPn - · - - ·· - · ~· - ·· --
1. Heading for manipulated/ responding variable 2. 2 x 2 table
sa'lhole answer:
I Solvent I Solubility
No response or wrong response
2
1
0
Marks 2
1
0
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