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MODULE 2
CHEMISTRY 2014
KEDAH
PAPER 1 ANSWER
Question No. Answer Question No. Answer
1 B 26 A
2 A 27 A
3 D 28 B
4 A 29 A
5 C 30 C6 D 31 B
7 A 32 C
8 D 33 C
9 D 34 B
10 C 35 D
11 D 36 D
12 D 37 A
13 B 38 C
14 D 39 A
15 B 40 B
16 C 41 B
17 C 42 C
18 A 43 C
19 A 44 A
20 C 45 C
21 C 46 B
22 C 47 D
23 A 48 B
24 A 49 D
25 B 50 C
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A
B
A
D
D
A
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MARK SCHEME : PAPER 2 MODULE B: CHEMISTRY
Question
NoMark Scheme Marks
1 a) Empirical formula : formula that shows the simplest whole number ratio of atoms ofeach element in a compound 1
b) To allow oxygen from the air to react with magnesium //To prevent fumes of magnesium oxide from escaping 1
d) (i) Mass of magnesium = 19.20 - 18.30 g = 0.9 g
Mass of oxygen = 19.80 - 19.20 g = 0.6 g 1
(ii) Elements Mg : ONo of mole 0.9 : 0.6
24 16
Ratio 0.0375 : 0.0375 // 1 : 10.0375 0.0375
1
1
(iii) MgO 1
(e) (i) Cu // Pb // Sn 1
(ii) To remove all the air in the combustion tube 1
(iii) To dry the hydrogen gas // as a drying agent 1
Total 9
Question
NoMark Scheme Marks
2 (a) Contact Process 1
(b) Oleum 1
(c) SO3 + H2SO4 H2S2O7 1
(d) 450-500OC 1
(e) Air (udara) 1
(f) Nitric acid 1
(g) (i) Acid rain corrodes the buildings made of calcium carbonate/limestone//
Acid rain corrodes concrete building
1
(ii) Reduce combustion of fossil fuels
Channel waste gases from factory through air filtering systems(accept any suitable answers)
1
1
Total 9
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3 (a) Heat released when one mol of water produce from reaction between hydrochoric
acid // acid and sodium hydroxide// alkaline solution. 1
(b) (i)
(ii)
(iii)
Heat change = mc
= 200 x 4.2 x 13
= 10 920 J = 10.92 kJ
No. of mol of H+ = 100 x 0.2
1000
= 0.02 mol
// No. of mol of OH-
= 100 x 0.21000
= 0.02 mol
Heat of neutralisation = 10920
0.02
= 546 000
Heat of neutralization = - 546 kJ mol-1
1
1
1(c)
correct diagram
labelled
1
1
(d) (i) Between -533 kJ mol-1
to 542 kJ mol-1
1
(ii) Ethanoic acid is a weak acid // ionise partially in water to produce hydrogen ion
Some heat is absorbed for ionization of ethanoic acid.
1
1
Total 10
546 kJmol-1
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5 (a) Sulphuric acid[r: H2SO4]
1
(b) H2SO4 + 2KOH K2SO4+ 2H2O
Correct formula reactant and product
Balanced
1
1
(c) (i) Able to calculate the volume of Y(V1) acid used with unit
M1V1= M 2V2
a b
0.1 (V1) = 0.2(25)
1 2
V1= 25 cm3 (r : without unit)
1
1
(ii) Able to calculate the mass of salt formed with unit
Number of mol Y acid = MV1000
= 0.1(25)
1000
=0.0025
Mass of salt formed= 0.0025 x 174
1
4 (a) Strong acid is an acid that ionises completelyin water to produce highconcentration of hydrogen ions.
1
(b) (i) Ethanoic acid 1
(ii) Ionise partially in water //produce low concentration of hydrogen ions. 1
(c) (i) 2 1
(ii) 10 x X = 250 x 0.02X = 0.5 mol dm
-3
11
(d) (i) water 1
(ii) H+ 1
(iii) Zn +2 HClZnCl2+ H21.correct formula and reactant
2.balancing
1
1
Total 10
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TOTAL 11
Section B
7 (a) (i) 1.No of mole of helium atoms= 4 mol //1 mol
42. No of mole of hydrogen atoms = 2 x 2mol //2 mol
2
1
1
(ii) 1.No of atom of hydrogen is double/twice than helium2.because no of mole of atom of hydrogen is double/twice than helium
11
(b) (i) Empirical formula = C5H7NMolecular Formula = C10H14N2
C5H7N C10H14N2
both contain element carbon,hidrogen and nitrogen
Contain 5 carbon atoms,7hidrogen atoms and 1 nitrogen
atom
Contain 10 carbon atoms,17hidrogen atoms and 2 nitrogen
atom
Shows simplest whole numberratio of atom of each element
Shows actual number of atom ofeach element
11
1
1+1
1+1
(ii) 1.brown bromine water decolourises2.nicotine undergoes addition reaction with bromine//c=c react with bromine
11
(c) (i) Wrong formula
1. AgCl22. Mg NO3
11
(ii) 2AgNO3 + MgCl2 2AgCl + Mg(NO3)2
1.correct formula of reactant and product2.correct balancing
11
(iii) 1. silver nitrate and magnesium chloride are reactants and silver chloride andmagnesium nitrate are products
2. silver nitrate , magnesium chloride and magnesium nitrate are in aqueoussolution but silver chloride in solid form
3. 2 mole of AgNO3react with 1 mole of MgCl2to form 2 mole of AgCl and1mole of Mg(NO3)2
(Note : point 3 ecf from (c)(ii))
1
1
1
Total 20
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(a) (i) 2H2O22H2O + O2
Correct formulabalanced
11
(ii)
Correct curve
axis and unitslabel expt(A,B) and time (20,40)
1
1
1
(iii) i) Increase the concentration of hydrogen peroxide 1
ii) 0.1 mol dm-3
/ any suitable higher concentration 1
iii) Volume 25 cm3/ any suitable volume to get that match the
concentration
1
iv) Any suitable application of concentration. 1
v) How the application is used. 1
(iv)
functional diagram
Labelled
1
1
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c) (i) 1. Rate of reaction of experiment B is higher 1
2. The presence of catalyst in experiment B 1
3. the reaction through the alternative path // lower activation energy 1
4. more colliding particle can achieve the lower activation energy 1
5. frequency of effective collision is higher. 1
c) (ii)
Correct graph
Label experiment (A,B)
Label activation energy
1
1
1
Total 20
Section C
9 a) i. Ionic: Y and X// Y and Z// Y and W
Covalent: W and X//W and Z //X and Z
1
1
ii Ionic:
Between Y and X
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ii.
or
Between Y and Z
Covalent
Correct no of shells and electron for each atoms involved
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Correct no of atoms// charge for each compund
1x2
1x2
ii Explain:Between element Y and X(sample for ionic)
Atom Y has 1 valence electron and atomX has 6 valence electron2 Atomof Y donate 1 electron each to form 2Y
+ion // 2Y2Y
+ + 2e
AtomX accept 2 electron to form X2-
ion // X + 2eX2-
To achieve stable octet electron arrangement2 ion Y
+and ion X
2-attract each other by a strong electrostatic forces
// Y2X ionic compound is formed
Between element W and X (WX2)(sample for covalent)
Oneatom W contribute 4electronsFour atom Z contribute 1electron to share.
One atom W share 4 pairs electron with four atom Z
Four single covalent bondare formedWZ4covalent compound is formed
1
111
11
11
1
11
Maximum mark 12
b)
Covalent Compound Ionic Compound d
Low melting and boiling points High melting and boiling points
Held by weak intermolecular
forces
Held by strong electrostatic
forces
Need more energy to overcome
the forces
Need less energy to overcome
the forces
or
1+1
1+1
1+1
Covalent Compound Ionic Compound
Cannot conduct electricity in
any state
Cannot conduct electricity in
solid state 1+1
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10 (a) Metal R: magnesium//zincReason: Metal R is more electropositive than iron// Iron nail does notrust//prevent iron from rusting//inhibit rusting of iron nail
Metal S: copper//tin//lead//silver//aurumReason: Iron is more electropositive than metal S// Iron nail rusts//speed up
rusting(accept any suitable metal R and S)
1
1
11
(b) Metal: magnesium // zinc// lead // tin
Eg:Oxidation nombor of Mg increases from 0+2 //MgMg
2++2e
Magnesium undergoes oxidation
Oxidation nombor of copper(II) ion decreases from +20// Cu2+
+2eCuCopper undergoes reduction
Redox reaction occurs as oxidation of magnesium and reduction of copper(II)ions occur simultaneously.
1
11
11
1
(c)
Diagram:
1. label2. functional apparatus
11
Suggested chemical:Potassium iodide solution(or any suitable reducing agent) 1
Can conduct electricity in
molten and aqueous state
Consist of molecules Consist of ions
Neutral particles Charged particles//Move freelyin molten and aqueous state
1+1
1+1
mark 6
TOTAL 20
Carbon
electrode
Potassium
iodide
solution
Carbon
electrode
Bromine water
Sulphuric acid
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Procedure:
1. Dilute sulphuric acid is poured into a U-tube.2. Using a dropper, potassium bromide solution is added at one arm
and bromine water at another arm.4. Carbon electrode is placed in each side of the U-tube.5. The electrodes are connected to a galvanometer by using connecting
wires// The external circuit is completed.6. Any changes that can be observed are recorded.
Half-equations:
2I-I2+ 2eBr2+ 2e2Br
-
1
11
11
1
1
Max 10
Total 20
END OF MARK SCHEME
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MODULE B :KIMIA PAPER 3: Mark Scheme
Questions Mark Scheme Mark
1(a) Able to state the three variables correctlySample answer
Manipulated Variable: metals in contact with Fe//P,Q,R
Responding Variable: rusting//blue spots//pink spots
Constant Variable: iron nail//electrolyte
3
Able to state any two variables correctly 2
Able to state any one variables correctly 1
No response or wrong response 0
1(b) Able to state the relationship between the manipulated variable and theresponding variable and state the direction correctly.
Sample answer
The further the distance between two metals in electrochemical series,
When less electropositive metal in contact with iron, the higher is the
intensity/more of blue spots/rust
3
Able to state the relationship between the manipulated variable and the
responding variable without stating the direction
Sample answer
When different metal in contact with iron, the more blue spot/rust formed
2
Able to give an idea of hypothesis
Sample answer
Pair of metal willproduce rust.
1
No response or wrong response 0
1(c)Able to make inference correctly.
Sample answer
Set Inference
I Metal P is less elctropositive than iron
II Metal Q is the most electropositive.
III Metal R is more electropositive than iron
3
Able to state 2 inference correctly 2
Able to state 1 inference correctly 1
No response or wrong response 0
1(d) Able to give the operational definition for rusting correctly with the 3
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following aspects:i.what you do
ii.what you observe
Sample answer
When less electropositive metal in contact with iron, blue spot form
Able to give the operational definition for rusting incompletely with any
one of the following aspects:i.what you do
ii.what you observe
Sample answer
Metal is put into jelly blue spot form
2
Able to give an idea of operational definition for rusting
Sample answer
Metal rust
1
No response or wrong response 0
1(e) Able to compare the difference between 1 day and 2 days correctly
Sample answer
The size/quantity of blue spot increase with time
3
Able to compare the difference between 1 day and 2 daysSample answer
More blue spot form
2
Sample answer
Blue spot form
1
No response or wrong response 0
1(f) Able to arrange the four metals correctlySample answer
P, Fe, R, Q
3
Able to arrange any three metals in sequence correctlySample answers
Fe, R, Q , // P, Fe, R
2
Able to arrange any two metals correctlySample answers
P, Fe// Fe, R// R, Q
1
No response or wrong response 0
1(g) Able to predict the metal correctlySample answer
Copper/Cu // Silver/Ag
3
Able to predict the metal less correctlySample answer
2
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Set III : 1.4 // 1.40
Able to record at least one reading 1
No response or wrong response 0
1(k) Able to construct a table that consists of:1.Headings for manipulated and responding variables with unit
2. List all the variablesSample answer
Pairs of Metal Voltage (V)
Fe/P 2.2
Fe/Q 1.4
Fe/R 3.4
3
Able to construct a table that consists of:
1.Headings for manipulated and responding variables without unit2. List all the variablesSample answer
Pairs of Metal Voltage
Fe/P 2.2
Fe/Q 1.4
Fe/R 3.4
2
Able to construct a table that consists of:
1.Headings for manipulated and responding variables
Sample answer
Pairs of Metal Voltage
1
No response or wrong response 0
2(a) Able to give the problem statement correctlySample answer
Does soap more effective than detergent for cleansing action in hard water?
3
Able to give the problem statementSample answer
Does soap more effective than detergent ?
2
Able to give an idea of the problem statement.Sample answer
Does soap more effective ?
1
No response or wrong response 0
2(b) Able to state all variables correctlySample answer
Manipulated variable: Detergent ,soap
Responding Variable: effectiveness of cleansing action
Fixed variable : hard water//mass/volume of detergent and
3
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soap//volume of water
Able to state any two variables correctly 2
Able to state any one variable correctly 1
No response or wrong response 0
2(c) Able to state the hypothesis correctlySample answer
Detergent is more effective than soap in hard water
3
Able to state the hypothesisSample answer
Detergent is more effective
2
Able to give an idea of the hypothesisSample answer
Detergent is for cleaning action
1
No response or wrong response 0
2(d) Able to list the materials and apparatus completelySample answer
Materials
1. dirty cloth/socks
2. soap and detergent
3. hard water
Apparatus
1. Beaker/basin
2.
Measuring cylinder3. Spoon/spatula
3
Able to list the materials and apparatusSample answer
Materials
1. cloth
2. soap and detergent
3. hard water
Apparatus
4. Beaker/basin/container
2
Able to give an idea of materials and apparatusSample answer
1. detergent/soap
2. cloth
3. water
1
No response or wrong response 0
2(e) Able to state all steps of procedure correctlySample answer
1.Pour 100-200 ml of hard water into a beaker
2. Add/put 1-2 spoon of detergent into the beaker3. Soak/dip a dirty cloth in the beaker
4. Leave for 30 minutes
5.Record the observation
6. Repeat steps 1-5 using soap.
3
Able to state the steps 1,2,3 and 5 2
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Able to state steps 1.2 and 3 1
No response or wrong response 0
2(f) Able to construct a table that consists of:
1.Headings for manipulated and responding variables2. List all the variablesSample answer
Type of cleaning agent Observation/Effectiveness
Detergent
Soap
2
Able to construct a table that consists of:
1.Headings for manipulated and responding variables
Sample answer
Type of cleaning agent Observation
1
No response or wrong response 0
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