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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

more examination papers at :www.myschoolchildren.com

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 ..


. .

MAJLIS PENGETUA SEKOLAH MALAYSIA

CAWANGAN PULAU PINANG

SKEMA JAWAPAN

---- -------/ -- --MODUL-lATIHAN BERFOKUS

__ .SPM 2014

KIMIA KERTAS 2·

4541/2


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


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


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


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


·-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


[: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


: ~}_,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


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


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


. --·- · / .· .- . . - . ..-· -~ -·· .. ··

MAJLIS PENGET~A SEKOLAH MALAYSIA CAWANGAN PULAU PINANG

SKEMA JAWAPAN

-- MODUL LATIHAN-BERFOKUS

SPM 2014

KIMIA KERTAS 3

4541/3


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 3 of the observations or· inferences accurately. 3


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.


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


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



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.


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


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


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.


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


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


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.


7

Able to state an idea of observation. 1

Sample answer: The test tube/ jelly turns blue.


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.


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


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.


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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