1
BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH
DAN SEKOLAH KECEMERLANGAN
KEMENTERIAN PELAJARAN MALAYSIA
CHEMISTRY
TRIAL-EXAM
SPM 2012
MARKING SCHEME
PAPER 1
PAPER 2
PAPER 3
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SKEMA KERTAS 1
PENTAKSIRAN DIAGNOSTIK AKADEMIK
SBP 2012
CHEMISTRY 4541/1
1 A 26 C
2 A 27 D
3 C 28 C
4 A 29 D
5 A 30 B
6 D 31 B
7 B 32 C
8 A 33 A
9 B 34 C
10 A 35 C
11 B 36 D
12 A 37 A
13 D 38 B
14 C 39 B
15 D 40 D
16 A 41 D
17 B 42 D
18 D 43 A
19 C 44 B
20 B 45 C
21 C 46 B
22 D 47 C
23 D 48 B
24 B 49 D
25 A 50 C
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MARKING SCHEME
CHEMISTRY PAPER 2 SECTION A (4541/2)
Question Mark scheme Sub
Mark
Total
Mark
1(a) A: Detergents
B: Soap
r : sodium salt
1
1
2
1(b)(i) magnesium ion // or calcium ion
r : Mg2+
, Ca2+
1
2 1(b)(ii) Soaps are biodegradable 1
1(c) Analgesics
Psychotherapeutic
r: wrong spelling
1
1
2
1(d)(i) Sugar
Aspartame
1
1
3
1(d)(ii) To add / restore the colour of food // To enhance its visual
appeal / appearance// more attractive
1
TOTAL 9
Question Mark scheme Sub
Mark
Total
Mark
2(a)(i) Magnesium
r:Mg 1
2
2(a)(ii) Has 3 shell occupied with electrons 1
2 (b)
1. Proton number of chlorine is higher than magnesium // the
number of proton of chlorine atom higher than magnesium atom
// total positive charged in nucleus higher than magnesium
2. The attractive force between the nucleus and the electrons in
chlorine atom stronger than magnesium atom // nuclei attraction
towards electrons stronger.
1
1
2
2(c) Light bulb // in welding process 1 1
2 (d) Argon 1 1
2(e)(i)
3 Cl2 (g) + 2 Fe (s) 2 FeCl3(s)
1
1
2(e)(ii) Mass iron (III) chloride = 0.05 x 161 // 8.05 g 1 1
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4
2(e)(ii)
1
1
Total 9
Question Mark scheme Sub
Mark
Total
Mark
3(a)(i) 6 1
4
3(a)(ii) To estimate the age of fossils and artifacts 1
3(a)(iii) C-12 // C-13
1
3(a)(iv) 7 / 6 1
3(b)(i) A: covalent
r: covalent bond
B: ionic
r: ionic bond
1
1
6
3(b)(ii) 2.8.8.1 1
3(b)(iii) High melting point and boiling point // conduct electricity in
molten or aqueous solution // soluble in water // insoluble in
organic solvent.
[Any one]
1
3(c)(iv) 2K + Cl2 2KCl
1. Formula of reactants and products correct
2. Balance the chemical equation
1
1
TOTAL 10
13
C 6
12
C 6
Or
Hot iron wool
Wul besi panas
Heat
Panaskan
Chlorine gas
Gas klorin
√
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Question Mark scheme Sub
Mark
Total
Mark
4(a)(i) Pipette
r: wrong spelling 1
3
4(a)(ii) Phenolphthalein // methyl orange
r: wrong spelling 1
4(a)(iii)
Phenolphthalein : pink to colourless //
methyl orange : yellow to orange
1
4(b)(i)
2KOH + H2 SO4 K2 SO4 + 2H2O
Formula of reactants and products correct
Balance the chemical equation
1
1
2
4(b)(ii)
1. Mol of KOH = (1.0)(25) / 1000
= 0.025 mol
2. Molarity of H2 SO4 = (0.0125)(1000) / 10
= 1.25 mol dm-3
//
Molarity of H2SO4 = 0.0125 /0.01 = 1.25 mol dm-3
Or
b
a
VM
VM
bb
aa ; Molarity of H2SO4 = 10
)25(1
2
1x
= 1.25 mol dm-3
r: wrong unit or without unit
1
1
2
4(c)(i) Hydrogen ion
r: H+ (symbol ion)
1
3 4(c)(ii)
1. no water
2. contain of molecule // no hydrogen ion, H+
1
1
TOTAL 10
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6
Question Mark scheme Sub
Mark
Total
Mark
5(a) Chemical formula that shows the simplest whole number ratio of
atom of each element in the compound.
1 1
5(b)(i) Mass of Mg = 2.4 g
Mass of O = 1.6 g
1
6
5(b)(ii) Mole of Mg = 2.4 / 24 = 0.1
Mol of O = 1.6 / 16 = 0.1
Mg : O = 1 : 1
1
1
5(b)(iii) MgO 1
5(b)(iv) to allow oxygen enter the crucible 1
5(b)(v) Repeat the process heating, cooling and weighing until a
constant mass is obtained.
1
5(c)
Apparatus set-up correct and functional
Labeled : magnesium ribbon, heat
1
1
2
5(d)(i) Zinc oxide // aluminium oxide
r: formula
1
2
5(d)(ii) Silver is less reactive / not reactive metal 1
TOTAL 11
Magnesium
ribbon
Heat
crucible
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7
Question Mark scheme Sub
Mark
Total
Mark
6(a) Hydrogenation 1
5
6(b) C4H8 + H2 C4H10 1
6(c)(i)
Mole of butene = 2.8 /56 = 0.05 mol
1
6(c)(ii) P1. 1 mol of butene burns in oxygen gas produce 4 mol of
carbon dioxide.
Therefore 0.05 mol of butene burns in oxygen gas produce 0.2
mol of carbon dioxide //
C4H8 : CO2
1 : 4
0.05 : 0.2
P2. volume of CO2 = 0.2 x 24 = 4.8 dm3
1
1
6(d) P1: 2 cm3 of but-2-ene and 2 cm
3 of butane gas are filled in two
different test tubes.
P2 : 2 -3 drops of acidified potassium manganate (VII) solution
is added to both test tubes.
P3: But-2-ene decolourises purple acidified KMnO4
Purple acidified KMnO4 in butane remains unchange.
Or
P1: 2 cm3 of but-2-ene and 2 cm
3 of butane gas are filled in two
different test tubes.
P2 : 2-3 drops of bromine water is added to both test tubes.
P3: But-2-ene decolourises brown bromine water.
Brown bromine water in butane remains unchange.
1
1
1
Or
1
1
1
3
6(e)(i) A: unvulcanised rubber
B: vulcanised rubber
1
1
3
6(e)(ii) Rubber type B/ vulcanised rubber is more elastic than rubber
type A/ unvulcanised rubber
1
TOTAL 11
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8
SECTION B
Question Mark scheme Mark Σ
Mark
7 (a)
(i) Ascending order : Cu, Y,X, W
(ii)
P1 : Positive terminal : Cu
P2 : Potential difference : 1.3V
P3: Copper is less electropositive // X is more electropositive
correct value and unit
1
1
1
1
4
7 ( b) (i)
Experiment I : Pb 2+
, Cl-
Experiment II: H +
. OH- , Cl
–
r: lead(II) ion, chloride ion
Hydrogen ion, hydroxide ion, chloride ion
1
1
2
7(b)(ii)
Experiment 1 Experiment II
Product at anode:
Chlorine gas
Products at cathode:
Oxygen gas
Reason:
P1: Cl-
is discharged
P2: the only
anion presence
and discharged at anode
Reason:
P1:OH- is selected to be
discharged
P2:the position of OH- is lower
than Cl- in electrochemical series
.Half equation:
2Cl-
Cl 2 + 2e
P1:Correct formula of
reactant and product :
P2: Balance equation
. Half equation:
4OH- 2 H2O + O2 + 4e
P1: Correct formula of reactant
and product
P2: Balance equation
1 + 1
1 + 1
1 + 1
1 + 1
1 + 1
10
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9
7(c)
P1: Positive terminal: R
P2: Negative terminal:Cu
P3: Suitable metal for R : Silver
P4: Suitable solution for R : Silver nitate solution
1
1
1
1
4
Total 20
Question Mark scheme Mark Σ Mark
8(a) P1. Smaller size has larger total surface area.
P2. Absorb heat faster.
P3. Bigger size has smaller total surface area.
P4. Absorb heat slower
1
1
1
1
4
(b)(i) Copper(II) sulphate 1 1
(b)(ii) 1. Experiment I
Rate of reaction = 40/2 = 20 cm3 min
-1
2. Experiment II
Rate of reaction = 60/2 = 30 cm3min
-1
1
1
2
(b)(iii) P1. Rate of reaction in Experiment II is higher than
Experiment I.
P2. Substance X used in Experiment II is a catalyst.
P3. Catalyst provided an alternative path with requires a
lower
activation energy.
P4. More particles are able to achieve lower activation
energy.
P5. Frequency of effective collisions between zinc atoms and
hydrogen ions are higher.
1
1
1
1
1
5
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10
(b)(iv) 1. Label of axes and unit
2. Correct curve and label
1
1
2
(v) 1. Correct formula of reactants and product
2. Balanced equation
Zn + 2H+ Zn
2+ + H2
1
1
2
(vi) 1. Rate of reaction using sulphuric acid is higher.
2. Volume of hydrogen gas released is doubled.
3. Sulphuric acid is a diprotic acid.
4. Concentration of hydrogen ions in sulphuric acid is double
than that in hydrochloric acid.
1
1
1
1
4
Total 20
Volume of
gas / cm3
Time / min
Exp II
Exp I
2
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Question Mark scheme Mark Σ
Mark
9(a) P1: Magnesium atom undergoes oxidation
P2: oxidation number increases from 0 to 2+
P3: Copper (II) ion undergoes reduction
P4: oxidation number decreases from +2 to 0
P5: The reaction involving oxidation and reduction
1
1
1
1
1
MAX
4
(b) Experiment I
L can reduce copper(II) oxide// L can react with copper(II) oxide
L is more reactive than copper.
Experiment II
M can reduce copper(II) oxide//M can react with copper(II)
oxide
M is more reactive than copper.
Experiment III
M cannot reduce L oxide // M cannot react with L oxide.
M is less reactive than L//L is more reactive than M.
The arrangement in order of increasing reactivity toward oxygen is Cu,
M and L.
1
1
1
1
1
1
Max
5
1
6
(c)
Procedure :
P1. Pour 2 cm3 of potassium bromide solution into a test tube.
P2. Add 2 cm3 of chlorine water to the test tube and shake the mixture.
P3. Add 2 cm3 of 1,1,1 trichloroethane to the test tube and shake the
mixture.
P4. Record the observation
P5. Repeat steps 1-4 using another halogens and halide solution.
.
1
1
1
1
1
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12
Result :
Chlorine water Bromine water Iodine water
Potassium
chloride
X X
Potassium
bromide X
Potassium
iodide
Ionic equation:
1. Cl2 + 2Br- 2Cl
- + Br2
2. Cl2 + 2I- 2Cl
- + I2
3. Br2 + 2I- 2Br
- + I2
1
1
1
1
1
10
20
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13
Question Mark scheme Mark Σ
Mark
10(a)
Precipitation / double decomposition reaction
Barium nitrate solution/barium chloride solution
[Any sulphate solution]
Example: sodium sulphate, potasium sulphate, sulphuric
acid
Reject : Lead(II) sulphate, calcium sulphate
Ba2+
+ SO42 BaSO4
1
1
1
1
4
10(b)(i) Cation : Iron(II) ion / Fe
2+
Anion: Chloride ion / Cl
1
1
2
10(b)(ii)
Test for NO3
P1: Add 2 cm3
of dilute sulphuric acid into the test tube follow
by 2 cm3 of iron(II) sulphate solution.
P2: Add a few drops of concentrated sulphuric acid
P3: carefully and slowly along the side of slanting test tube
into the mixture.
P2: A brown ring is formed.
1
1
1
1
4
10(c)
Procedure:
P1. Add zinc nitrate solution to sodium carbonate solution
in a beaker.
P2. Stir the mixture.
P3. Filter the white precipitate/solid zinc carbonate formed.
P4. Add zinc carbonate to sulphuric acid in a beaker until
some zinc carbonate solid no longer dissolve.
P5. Filter the mixture.
P6. Transfer the filtrate to a evaporating dish.
P7. Heat the filtrate(zinc sulphate solution) until saturated//
Heat the filtrate to about one-third (1/3) of its initial
volume
P8. Allow the saturated solution to cool at room temperature.
P9. Filter the crystals formed.
P10. Dry the crystals by pressing it between two sheets of
filter papers.
1
1
1
1
1
1
1
1
1
1
10
Total 20
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1
Marking Scheme Chemistry Paper 3
[KK0503 – Mengukur menggunakan nombor]
[KK0506 – Berkomunikasi]
Question Rubric Score
1(b)
Able to construct the table with correct label and unit
Sample answer:
Type of
blocks
Diameter of dents(cm) Average diameter
of dents (cm) I II III
Copper 1.35 1.60 1.50 1.48
Bronze 1.20 1.00 1.20 1.13
3
Able to construct the table without correct label or unit 2
Able to construct the idea of table 1
No response or wrong response 0
[KK0501 – Memerhati]
Question Rubric Score
1(c) (i)
Able to state the observation correctly and accurately
Sample answer:
The average diameter of dents on bronze block is 1.13 cm, the
average diameter of dents on copper block is 1.48 cm.//
The size / diameter of dents on bronze block is smaller than the size
/ diameter of dents on copper block//
The size / diameter of dents on copper block is bigger than the size /
diameter of dents on bronze block
3
Able to state the incomplete observation
Sample answer:
Able to state the average diameter of one block only.
The size / diameter of dents on bronze block is smaller//
The size / diameter of dents on copper block is bigger.
2
Able to state the idea of observation
Sample answer :
The size / diameter of dents on bronze block is small/
The size / diameter of dents on copper block is big.
1
No response or wrong response 0
Question Rubric Score
1(a)
Able to measure the diameter of dents correctly and accurately
Sample answer:
Copper: 1.35, 1.60, 1.50
Bronze: 1.20, 1.00, 1.20
3
Able to measure the diameter of dents without 2 decimal point 2
Able to state 4 diameter of dents correctly 1
No response or wrong response 0
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2
[KK 0504 – Membuat Inferens]
Question Rubric Score
1(c)(ii)
Able to state the inference correctly and accurately
Sample answer:
Bronze is harder than copper //
Copper is less harder than bronze
3
Able to state the incomplete inference correctly
Sample answer :
Bronze is harder //
Copper is less harder
2
Able to state the idea of inference
Sample answer :
Bronze is hard//
Copper is soft
1
No response or wrong response 0
[KK0508 – Mentafsir data]
Question Rubric Score
1(c)(iii)
Able to explain the arrangement of particles in the materials
correctly
Sample answer:
1. The atomic size of tin is bigger than copper// The atomic size of
tin and copper are different
2. The presence of tin atoms in bronze disrupts the orderly
arrangement of copper atoms
3. Reduces/ Prevent the layers of atoms from sliding over each
other/ easily.
3
Able to state any 2 points // 3 points without the name of atoms
correctly
2
Able to state point 1 point correctly 1
No response or wrong response 0
[KK0510 – Mengawal pemboleh ubah]
Question Rubric Score
1(d)
Able to state all the variables
Sample answer:
Manipulated variable : Type of materials / blocks//
Copper and bronze
Responding variable : Size / diameter of dents
Fixed variable : Size / diameter and mass of steel ball bearing //
height of the weight // mass of the weight
3
Able to state two variables correctly 2
Able to state one variable correctly 1
No response or wrong response 0
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3
[KK0511 – Membuat hipotesis]
Question Rubric Score
1(e)(i)
Able to state the hypothesis correctly
Sample answer:
Bronze is harder than copper //
Copper is less harder than bronze
3
Able to state the hypothesis less correctly 2
Able to state idea of hypothesis 1
No response or wrong response 0
[KK0509 – Mendefinisikan secara operasi]
Question Rubric Score
1(e)(ii)
Able to state the operational definition correctly
Sample answer:
The smaller dent produced when a 1 kg weight is dropped on the
block.
3
Able to state the operational definition less correctly The smaller dent produced when a weight is dropped on the block//
When a weight is dropped on the block results smaller dent, thus the
harder the block is.
2
Able to state idea of operational definition The harder block has a smaller dent.
1
No response or wrong response 0
[KK0502 – Mengelas]
Question Rubric Score
1(e)(ii)
Able to classify all substances correctly
Sample answer:
Alloy Pure metal
Steel
Brass
Pewter
Iron
Chromium
Tin
3
Able to classify at least 4 substances less correctly
Sample answer:
Alloy Pure metal
Steel
Brass
Tin
Iron
Chromium
Pewter
2
Able to state idea of classification (at least 2 correct)
Sample answer :
Alloy Pure metal
Iron
Chromium
Pewter
Steel
Brass
Tin
1
No response or wrong response 0
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4
[KK0505 – Meramal]
Question Rubric Score
2(a)
1. Able to show an extrapolation on the graph .
Sample answer:
2. Range of answer[ 2600 - 2700 ]
3. Show the negative sign and correct unit, kJmol-1
3
Able to state any two correct answers
2
Able to state any one correct answer
1
No response or wrong response 0
[KK0507 – Menggunakan perhubungan ruang dan masa]
Question Rubric Score
2(b)
Able to state the relationship between the number of carbon atom
per molecule and the time taken for cooking correctly
Sample answer
The higher the number of carbon atom per molecule alcohol, the
shorter the time taken for cooking
3
Able to state the relationship between the number of carbon atom
per molecule and the time taken for cooking less correctly
Sample answer
The higher the number of carbon atom, the shorter the time taken
for cooking
2
Able to give relevant idea 1
No response or wrong response 0
Number of carbon atom per molecule of alcohols
Heat of combustion/ kJ mol-1
Haba pembakaran/ kJ mol-1
5
0
0
0 1 2 3 4
500
1000
1500
2000
2500
3000
3500
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5
[KK0512 –Menyatakan masalah]
Question Rubric Score
3(a)
Able to give the problem statement correctly
Sample answer:
How does different type of metals in contact with iron affect
rusting?//
Does more electropositive metal in contact with iron inhibit the
rusting of iron?//
Does less electropositive metal in contact with iron speed up the
rusting of iron?
3
Able to give the problem statement less correctly
To investigate the affect of other metals on the rusting of iron//
How does a metal affect the rusting of iron?
2
Able to state an idea of hypothesis
More electropositive metal inhibit the rusting of iron//
Less electropositive metal speed up the rusting of iron
1
No response or wrong response
0
KK0512 – Menyatakan pemboleh ubah]
Question Rubric Marks
3(b)
Able to state all the three variables correctly
Manipulated variable :
Name of metal R and metal S// type of metals
Responding variable :
Rusting of iron//iron rust//formation of blue spot
Constant variables:
Iron nail//Gelatine solution with potassium
hexacyanoferrate(III) and phenolpthtalein
3
Able to state any two variables correctly 2
Able to state any one variable correctly 1
No response or wrong response
0
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6
[KK0512 – Menulis hipotesis]
Question
Rubric Marks
3(c) Able to state the relationship between the manipulated variable
and the responding variable and state the direction.
Sample answer:
When a more electropositive metal is in contact with iron,
the metal inhibits rusting. // When a less electropositive
metal is in contact with iron, the metal speed up rusting
3
Able to state the relationship between the manipulated variable
and the responding variable less correctly
Sample answer:
A more electropositive metal will prevent iron from
rusting. // A less electropositive metal will cause iron to
rust.
2
Able to state an idea of hypothesis
Sample answer:
Metal R and metal S affect rusting (of iron)
1
No response or wrong response 0
[KK0512 – Menyenaraikan bahan dan radas]
Question Rubric Mark
3 (d) Able to give complete list of substances and apparatus
Answer:
Substances
Two Iron nails,
Magnesium/zinc/aluminium strip
Tin/copper/lead/silver strip
Potassium hexacyanoferrate(III) solution +
phenolphthalein
[Any suitable electrolyte]/[water]
Apparatus
Test tube/boiling tube
Test tube rack
Sand paper
3
Able to list basic materials and apparatus
Sample answer:
Materials
Magnesium/zinc/aluminium strip
Tin/copper/lead/silver strip
Iron nail
Any suitable electrolyte
2
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7
Apparatus:
Any suitable container
Able to give an idea of the materials and apparatus
Sample answer:
Materials
Iron
Any electrolyte
Apparatus
Any suitable container
1
No response or wrong response 0
[KK0512 – Memilih teknik]
Question Rubric Marks
3 (e)
Able to state all the steps correctly
Sample answer:
1. Clean the iron nails and metals strip with sand paper.
2. Coil iron nails with magnesium ribbon and copper strip.
3. Put the coiled iron nail into different test tubes.
4. Pour the hot jelly solution containing potassium
hexacyanoferrate(III)solution and phenolphthalein into
the test tube.
5. Leave the test tube in a test tube rack for a day.
6. Record the observation.
3
Able to state the steps 2,4,and 6 correctly 2
Able to state steps 2 and 4 correctly
[2 and 4 ]//the idea combining iron and any metals and any
substances
1
No response or wrong response 0
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[KK0512 – Mempamerkan perancangan]
Question Rubric Marks
3 (f) Able to tabulate the data with the following aspects
1. Heading for the manipulated variables
[pair of metals//Test Tube]
2. Heading for responding variables
Sample answer:
Pair of metals Observation
Mg/Fe
Cu/Fe
2
Able to give an idea on tabulation of data at least one
information stated in the table
1. At least one heading
Sample answer
Set
1
No response or wrong response 0
PERATURAN PEMARKAHAN TAMAT
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