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SULIT 4541/1
4541/1
Kimia
Kertas 1
Ogos
2007
1¼ jam
BAHAGIAN SEKOLAH
KEMENTERIAN PELAJARAN MALAYSIA
______________________________________________
PEPERIKSAAN PERCUBAAN SPM 2007
KIMIA
Kertas 1
Satu jam lima belas minit
JANGAN BUKA KERTAS SOALAN INI HINGGA DIBERITAHU
1. Kertas soalan ini mengandungi 50 soalan.
2. Jawab semua soalan
3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan
4. Bagi setiap soalan hitamkan satu ruangan sahaja
5. Sekiranya anda hendak menukar jawapan, padamkan tanda yang telah dibuat.
Kemudian hitamkan jawapan yang baru.
6. Rajah yang mengiringi soalan tidak dilukiskan mengikut skala.
7. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh
diprogramkan.
Kertas soalan ini mengandungi 19 halaman bercetak
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1 Which of the following processes, proved the kinetic theory of matter?
A
B
C
D
Diffusion
Photosynthesis
Respiration
Neutralization
2 Which of the following is a chemical formula of ammonium sulphate?
A
B
C
D
NH4SO4
(NH4)2SO4
(NH3)2SO4
(NH4)3(SO4)2
3 Elements in the Periodic Table are arranged according to an increase in
A
B
C
D
proton number
nucleon number
relative atomic mass
relative molecular mass
4 Which of the following substances is a covalent compound?
A
B
C
D
Copper
Ammonia
Lead(II) oxide
Sodium chloride
5 Which of the following substances is an electrolyte?
A
B
C
D
Hydrogen chloride in methyl benzene
Molten aluminium oxide
Glucose solution
Copper(II) carbonate powder
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6 Which of the following statements is true about alkali?
A
B
C
D
Weak alkali is an alkali that undergoes high rate of ionization.
Strong alkali has low pH value
Alkalis are bases that are soluble in water.
Alkalis are not corrosive
7 Which of the following is a soluble salt?
A
B
C
D
Lead(II) iodide
Copper(II) carbonate
Barium sulphate
Sodium hypochlorite
8 The body of the car shown in the diagram below is made of alloy T.
What is alloy T?
A
B
C
D
Steel
Brass
Bronze
Duralumin
Alloy T
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9 Which of the homologous series is correctly paired to its functional group?
Homologous series Functional groups
A
Ester
B
Alkene
C
Alcohol
D
Carboxylic acid
10 Which of the following statements correctly explains the meaning of effective collision?
A
B
C
D
The collision which takes place before reaction.
The collision where its energy is less than the activation energy.
The collision that can causes reaction.
The collision that has the highest energy.
11
Which of the following is true about the substances?
A
B
C
D
Reducing agent
Oxidising agent
Dehydration agent
Hydration agent
Bromine water
Acidified potassium manganate(VII)
Acidified potassium dichromate(VI)
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12 Which of the following processes occurs when ice changes to water ?
A
B
C
D
Endothermic
Exothermic
Neutralization
Freezing
13 Paracetamol is used for
A
B
C
D
reducing pain
reducing anxiety
destroying of bacteria
controlling the level of glucose in blood
14 The diagram below shows the molecular formula of glucose.
What is the empirical formula for glucose?
A
B
C
D
CH2O
CH2O2
C2H4O2
C6H12O6
15
Which of the following is the atomic structure of lithium atom, ?
A
B
C
D
3p 3p
4p 4p
C6H12O6
7
3
Li
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16 The figure shows three elements in Period 3 of the Periodic Table.
X Y Z
Which of the following is true about the properties of oxide formed?
A
B
C
D
The oxide of Z is basic
The oxide of Y is acidic
The formula of oxide Y is YO
The oxide of X reacts with an acid to form salt and water
17 Which of the following substances is made up of ions?
A
B
C
D
Sulphur
Naphthalene
Sulphur trioxide
Potassium chloride
18 Which of the following ions are present in copper(II) sulphate solution?
A
B
C
D
Hydrogen ions and hydroxide ions
Copper(II) ions and sulphate ions
Copper(II) ions ,hydrogen ions, suphide ions and oxide ions
Copper(II) ions, hydrogen ions, sulphate ions and hydroxide ions
19 Dry hydrogen chloride gas is passed through methyl benzene for a few minutes. Which
of the following statements is true about the liquid produced?
I
II
III
IV
A
B
C
D
it has a pH value of less than 7
it consists of hydrogen chloride molecules
it changes blue litmus to red
it does not conduct electric current
I and III only
II and IV only
I, II and III only
IV only
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20 The diagram shows part of a polymer molecule
CH3 H CH3 H CH3 H
C C C C C C
H H H H H H
Which is its monomer?
A
B
C
D
21 Nitric acid will change to nitrate salt when hydrogen ions are replaced by
I
II
III
IV
A
B
C
D
copper ion
hydroxide ion
carbonate ion
ammonium ion
I and II only
I and IV only
II and IV only
I, III and IV only
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22 The graph shows the volume of carbon dioxide gas produced against time for the
reaction of calcium carbonate and sulphuric acid.
The gradient of the graph decreases with time because
A
B
C
D
catalyst is not used
volume of mixture decreases
temperature of reaction decreases
concentration of sulphuric acid decreases
23 The equation below shows a chemical reaction.
Based on the equation given, name the reaction.
A
B
C
D
Hydrogenation
Polymerization
Halogenation
Substitution
Volume of CO2
gas / cm3
Time / second
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24 The diagram below shows the electrolysis process of copper(II) sulphate solution using
copper as an electrode.
Which of the following substances are oxidized and reduced in this cell?
Oxidised Reduced
A Hydroxide ion Copper(II) ion
B Hydroxide ion Copper atom
C Copper atom Copper(II) ion
D Copper atom Hydrogen ion
25 The reaction between nitrogen and oxygen can be represented by the following equation:
N2 (g) + O2(g) 2NO(g) H = +181 kJ
Which of the following energy level diagrams represent the above reaction?
A
B
C
D
Copper
Copper(II) sulphate
solution
H = +181
kJ
2NO(g)
Energy
Energy
N2 (g) + O2(g)
2NO(g)
H = +181 kJ
N2 (g) + O2(g)
2NO(g)
H = +181 kJ
Energy
2NO(g)
N2 (g) + O2(g)
H = +181 kJ
Energy
N2 (g) + O2(g)
H = +181 kJ
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26 The diagram shows a label on a bottle of orange juice.
X is one of the important ingredients to make orange juice last longer.
What is X?
A
B
C
D
Sodium nitrite
Sodium nitrate
Ascorbic acid
Benzoic acid
27 The figure shows the arrangement of particles of a substance that undergoes the change
of state through process X
What is process X ?
A
B
C
D
Melting
Boiling
Freezing
Sublimation
SUKARAMAI ORANGE JUICE
Ingredients: water, sugar, X , sulphur dioxide, aspartame,
vitamin A and D
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28 The equation below shows the reaction between sulphuric acid and sodium hydroxide
solution.
H2SO4 + 2KOH K2SO4 + 2H2O
What is the number of moles of sodium sulphate salt produced if 0.2 mol of sodium
hydroxide is used?
A
B
C
D
0.10 mol
0.05 mol
0.22 mol
0.25 mol
29 The table shows the electron arrangements of atoms of four elements.
Which of the following is the correct arrangement of the elements according to
increasing order of electronegativity?
Element F Al Cl K
Electron
arrangement
2.7
2.8.3
2.8.7
2.8.8.1
A
B
C
D
F, Al, Cl, K
F, Cl, Al, K
K, Cl, Al, F
K, Al, Cl, F
30 The number of valence electrons of atoms X and Y are 2 and 7 respectively.
Which of the following chemical formulae and types of bonding are true for the
compound formed between X and Y?
Chemical Formula Type of Bonding
A XY2 ionic
B XY2 covalent
C X2Y ionic
D X2Y covalent
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31 The diagram below shows the set-up of the apparatus for electrolysis of concentrated
solution of sodium chloride
What is the product formed at the anode and cathode?
Anode Cathode
A O2 H2
B Cl2 H2
C Cl2 Na
D O2 Cl2
32 The diagram below shows 5 steps for preparing a standard solution of sodium hydroxide,
NaOH but not in correct order.
Which of the following steps is correct?
A
B
C
D
Q, S, P, R, T
R, Q, S, P, T
Q, P, S, R, T
R, Q, S, T, P
P- Transfer the solid sodium hydroxide into volume into the volumetric flask.
Q- Weigh the mass of sodium hydroxide
R- Add distilled water until the graduation mark.
S- Rinse the weighing bottle and pour the solution into the volumetric flask.
T- Shake the volumetric flask.
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33 The diagram below shows the test tubes containing lead(II) nitrate solution and
potassium carbonate solution but without a label. Which of the following solutions can
be used to distinguish both solutions?
I
II
III
IV
A
B
C
D
Sodium nitrate
Sodium iodide
Dilute nitric acid
Potassium sulphate
I and II only
II and IV only
II, III and IV only
I, II, III and IV
34 Which of the following is the alcohol produced from the alkaline hydrolysis of oil?
A
B
C
D
Ethane-1,2-diol
Glycerol
Cyclohexanol
Buthane-2-ol
Lead(II) nitrate
solution
Potassium carbonate
solution
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35
A group of students carried out an experiment to determine the rate of reaction of zinc
metal with dilute hydrochloric acid. The diagram above shows the graph for the total
volume of gas collected against time. The average rate of reaction for the whole
experiment is :
A
B
C
D
0.3 cm3/s
0.25 cm3/s
0.17 cm3/s
0.13 cm3/s
36 When a mixture of 2-butanol, CH3CHOHCH2CH3 and concentrated sulphuric acid is
heated, gas X is produced. Which of the following is the molecular structure of X?
A
B
C
D
CH3CH=CHCH3
CH3CH=C(CH3)2
(CH3)2CHCH=CH2
CH3CH2CH=CH2
37 The diagram below shows the changes of the sulphur in Contact Process.
S SO2 SO3 H2S2O7
Which of the following are the correct changes in the oxidation state of sulphur?
A
B
C
D
0 +4 +6 +6
0 +4 +6 +7
1 +3 +6 +8
1 +4 +6 +6
0 60 120 180 240 300 time / s
Volume of H2 gas / cm3
40 36
30
20 18
10
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38 The following equation shows the formation of water
H2(g) + ½ O2(g) → H2O(l) , ∆H = ─ 287 kJmolˉ¹
Which of the following is true regarding the above equation?
A
B
C
D
Activation energy for the reaction is high
If 1 mole of oxygen reacts 574 kJ of heat energy is absorbed
Combustion of 1 mole of hydrogen releases 287 kJ of heat energy
1 mole of water that is formed in the reaction received 287 kJ heat energy
39
Which of the following medicines is most appropriate in treating the above symptoms or
disorders?
A
B
C
D
Chlorpromazine
Amphetamine
Tranquilisers
Barbiturates
40 Which of the following isotopes is used to detect leakage in a gas pipe.
.
A
B
C
D
Carbon – 14
Cobalt – 60
Sodium – 24
Iodine - 131
41 34 g of ammonia consists of
[Relative molecular mass of ammonia = 17, Avogadro constant = 6.02 x 10 23
mol-1
]
I
II
III
IV
A
B
C
D
2 mole of nitrogen atoms
2 mole of ammonia molecules
1.204 X 1024
molecules
5 mole of hidrogen atoms
I and II only
I, II and III only
II, III and Iv only
I, II, III and IV only
A patient claims he always heard someone says something to him but he
didn’t see anybody around him during the situation.
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42 Profesional cyclists usually fill their bicycle tyres with gas X which makes the bicycle
lighter.
Which of the following elements X, Y, W and Z in the Periodic Table is suitable to be
used in bicycle tyres?
X
Y W
Z
A
B
C
D
X
Y
W
Z
43 The diagram below shows the symbols of atoms D and E
Atom D reacts with atom E to form a compound. Calculate the relative molecular mass
for the compound formed.
A
B
C
D
21
43
102
113
44 Calculate the volume of sodium hydroxide of concentration 0.5 mol dm-3
needed to
neutralize 25.0 cm3 sulphuric acid of concentration 0.20 mol dm
-3.
A
B
C
D
10 cm3
20 cm3
25 cm3
50 cm3
27
D 13
16
E 8
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45 The table below shows the potential difference of three simple voltaic cells.
Cell Pair of metal Potential
difference(V)
Negative
terminal
I Mg and Cu 3.0 Mg
II Mg and Zn 1.5 Mg
III Zn and Fe 0.5 Zn
What is the potential difference of a simple voltaic cell for pair of iron and copper ?
A
B
C
D
0.5 V
1.0 V
1.5 V
2.5 V
46 200 cm3 of 0.1 mol dm
-3 sodium chloride solution reacts completely with excess silver
nitrate. Calculate the mass of precipitate produced.
[Relative atomic mass of: Ag, 108; Cl, 35.5]
A
B
C
D
2.78 g
2.87 g
3.78 g
3.87 g
47 The uses of substance X;
What is substances X?
A
B
C
D
Nitric acid
Sulphuric acid
Ammonia
Ammonium sulphate
To clean metals.
To produce detergents.
To make paints.
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48 Graph represents the decomposition of 25 cm3
hydrogen peroxide of 0.5 mol dm-3
with
manganese(IV) oxide as a catalyst at a temperature of 30oC.
Which of the following experiments will produce graph II ?
Volume of
hydrogen peroxide / cm3
Concentration of
hydrogen peroxide/
mol dm-3
Temperature of
hydrogen peroxide / oC
A 15 0.7 30
B 15 0.5 30
C 40 0.7 30
D 40 0.5 20
49 Which of the following equations represents a redox reaction?
A
B
C
D
Pb(NO3)2(aq) + CuSO4(aq) PbSO4(s) + Cu(NO3)2(aq)
CH3COOH(aq) + NaOH(aq) CH3COOH(aq) + H2O(l)
Mg(s) + CuSO4(aq) MgSO4(aq) + Cu(s)
C2H4(g) + 3O2(g) 2CO2(g) + 2H2O(l)
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50 The diagram below shows the molecular formulae of two compounds A and B.
Substance X is formed when both compounds react with each other.
Which of the following set represents substance X?
Structural formula Name
A
Ethyl propanoate
B
Ethyl propanoate
C
Propyl propanoate
D
Propyl propanoate
END OF QUESTION PAPER
Compound A,
C2H5OH
Compound B,
C2H5COOH
Substance X
H H
H
H
C C C C
H H
H H H
H
O
O
C
H H
H
H
C C C C
H H
H H H
H
O
O
C
C
O
C
H
H
H
H
O
H H
H
C C H
H
H
C
C
O
C
H
H
H
H
O
H H
H
C C H
H
H
C
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NAMA:.................................................... Tingkatan :..............................
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4541/2
Kimia
Kertas 2
Ogos
2007
2 ½ jam
BAHAGIAN SEKOLAH
KEMENTERIAN PELAJARAN MALAYSIA
PEPERIKSAAN PERCUBAAN SPM 2007
KIMIA
Kertas 2
Dua jam tiga puluh minit
JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU
1. Tuliskan nama dan tingkatan pada ruang
yang disediakan.
2. Jawab semua soalan daripada Bahagian A.
Tuliskan jawapan anda dalam ruang yang
disediakan
3. Jawab satu soalan daripada Bahagian B
dan satu soalan daripada Bahagian
C.Jawapan kepada bahagian B dan
Bahagian C hendaklah ditulis pada kertas
tulis.
4. Anda diminta menjawab dengan lebih
terperinci untuk Bahagian B dan Bahagian
C. Jawapan mestilah jelas dan logik.
Persamaan, gambar rajah, jadual, graf dan
cara lain yang sesuai untuk menjelaskan
jawapan anda boleh digunakan.
5. Anda hendaklah menyerahkan kertas tulis
dan kertas tambahan, jika digunakan
bersama-sama dengan kertas soalan.
6. Penggunaan kalkulator saintifik yang tidak
boleh diprogramkan adalah dibenarkan.
Bahagian Soalan Markah
penuh
Markah
diperoleh
A
1 9
2 10
3 10
4 11
5 10
6 10
B 7 20
8 20
C
9 20
10 20
Jumlah
Kertas soalan ini mengandungi 16 halaman bercetak
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Section A
[60 marks]
Answer all questions.
1 Table 1 shows the melting point and boiling point of four substances.
Substances Melting point/ ºC Boiling point/ ºC
P -5 67
Q -105 -38
R 80 140
S 801 1413
TABLE 1
(a) What is the physical state of P and S at room temperature?
P: ....................................................................................................................
S: ....................................................................................................................
[2 marks]
(b) Draw the arrangement of particles of P at room temperature.
[1 mark]
(c) Explain why substance Q has a low melting point and boiling point.
............................................................................................................................
............................................................................................................................
. ............................................................................................................................
............................................................................................................................
[2 marks]
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(d) Draw the set up of apparatus to determine the melting point of substance R.
[2 marks]
(e) Sketch the graph of temperature against time for substance R when it is
heated from room temperature until it reaches a temperature of 100oC.
[2 marks]
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2 Diagram 2 shows part of the Periodic Table of Elements. A, B, C, D, E, F, G and
H do not represent the actual symbol of the elements.
A
B C D
E F G
DIAGRAM 2
Using the letters in the Periodic Table of Elements in Diagram 2, answer the
following questions.
(a) (i) Write the electron arrangement of atom F.
…………………………………………………………………………….
[1 mark]
(ii) Give the formula of ion F.
…………………………………………………………………………....
[1 mark]
(b) Arrange the elements A, B, C, D, E, F and G according to the atomic size in
ascending order.
…………………………………………………………………………………
[1 mark]
(c) Element A exists as a monoatomic gas. Explain why.
…………………………………………………………………………………
…………………………………………………………………………………
[1 mark]
(d) Element D is more reactive than element G. Explain why.
…………………………………………………………………………………
…………………………………………………………………………………
…………………………………………………………………………………
[2 marks]
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(e) E reacts with D to form a compound.
(i) What is the type of the compound formed?
………………………………………………………………………. ….
[1 mark]
(ii) Draw the diagram of electron arrangement for the compound formed.
[2 marks]
(iii) State one physical property of the compound formed.
…………………………………………………………………………...
[1 mark]
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3 Diagram 3 shows two types of cell.
DIAGRAM 3
(a) Write the formula of all the cations present in the copper (II) nitrate solution.
…………………………………………………………………………………
[1 mark]
(b) (i) State the observation at the cathode of cell J.
……………………………………………………………………………
[1 mark]
(ii) Write a half equation for reaction that occurred in the cathode of cell J.
……………………………………………………………………………
[ 1 mark]
(iii) Name the reducing agent in the cell J. ………………………………………………………………………….. [1 mark]
(iv) Name the product formed at the anode if copper electrodes in cell J are
replaced by carbon electrodes.
…………………………………………………………………………...
[1 mark]
Copper(II)
nitrate
solution
Cell J
V
Copper
plate Zinc plate
Cell K
Copper
electrode
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(c) Based on cell K,
(i) In which direction do electrons flow through the circuit in cell K? Show
your answer on Diagram 3.
[1 mark]
(ii) Name the reaction that occurs at the zinc plate.
……………………………………………………………………............
[1 mark]
(iii) State the changes in oxidation number for zinc in this reaction.
………………………………………………………………………........
[1 mark]
(iv) What happens to the cell voltage if the copper plate is replaced with the silver
plate?
…...……………………………………………………………………… [1 mark]
(d ) Write overall ionic equation for the reaction.
. ……………………………………………………………………………… [1 mark]
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4 Table 4 shows the particulars of four different types of manufactured substances
in industry.
Types Examples Components
Glass Borosilicate Silicon dioxide, sodium oxide, calcium oxide and X
Polymer Z Vinyl chloride
Alloy Bronze Copper and Y
Composite
material W
Concrete (cement, sand and small pebbles) and
steel
TABLE 4
(a) X is a part of the borosilicate glass. What is X?
........................................................................................................................................
[1 mark]
(b) (i) Identify Y.
..................................................................................................................................
[1 mark]
(ii) Bronze is harder than pure copper. Explain why.
................................................................................................................................
...............................................................................................................................
................................................................................................................................
[2 marks]
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(c) The following diagram shows a part of molecular structure of a compound Z.
H Cl H Cl H Cl
C C C C C C
H H H H H H
(i) Draw the structure of its monomer.
[1 mark]
(ii) Compound Z is often used as a water pipe. State one advantage of this type
of pipe as compared to metal pipes.
................................................................................................................................
[1mark]
(d) W can withstand high pressure and can support very heavy loads.
What is W?
.......................................................................................................................................
[1mark]
(c) Ammonium fertilizers can be prepared by reactions between ammonia solutian
and acids.
(i) Write the chemical equation for the preparation of ammonium sulphate
fertilizer.
................................................................................................................................
[1 mark]
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(ii) Urea, CO(NH2)2 is another example of ammonium fertilizers. Between urea
and ammonium sulphate, which one is more suitable for the growth of
plants? Prove it.
[Relative atomic mass: H,1; C,12; N,14; O,16; S,32]
[3 marks]
5 Diagram 5 shows the structural formulae of compounds J and K.
DIAGRAM 5
(a) State the homologous series for compounds J and K.
Compound J: ………………………………………………………….........
Compound K: …………………………………………………………….....
[2 marks]
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(b) Compound K can be produced from compound J under a high temperature
and pressure in the presence of a catalyst.
(i) Name compound K.
……………………………………………………………………….......
[1 mark]
(ii) Name the reaction.
……………………………………………………………………............
[1 mark]
(c) Compound L is produced when an acidic potassium dichromate (VI)
solution is added into a test tube containing compound K.
(i) State one observation for this reaction.
......……………………………………………………………………….
[1 mark]
(ii) Write the molecular formula of compound L.
……………………………………………………………………….......
[1 mark]
(d) Compound J burns completely in excess oxygen.
(i) Write the chemical equation for the complete combustion of J.
....................................................................................................................
[1 mark]
(ii) 5.6 g of compound J undergoes complete combustion at room
conditions. Calculate the volume of carbon dioxide gas released.
[1 mol of gas occupies 24 dm3 at room conditions;
Relative atomic mass: H,1; C,12]
[3 marks]
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6 A pupil carried out an experiment to determine the value of heat of neutralization.
Diagram 6 shows the set up of the apparatus used in the experiment.
The following data was obtained;
a) Why was a polystyrene cup used in this experiment?
…………………………………………………………………………………..
[1 mark]
(b) Given that the specific heat capacity of the solution is 4.2 Jg-1o
C-1
and the
density of the solution is 1.0 gcm-3.
(i) Calculate the change of heat in the experiment.
(ii) Calculate the heat of neutralization in the experiment.
[3 marks]
Initial temperature of hydrochloric acid = 28oC
Initial temperature of sodium hydroxide solution = 28oC
Highest temperature of the mixture of product = 41oC
100 cm
3of 2.0 mol dm
-3
Sodium hydroxide solution
100 cm3of 2.0 moldm
-3
hydrochloric acid
Thermometer
DIAGRAM 6
Polystyrene cup
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(c) Draw the energy level diagram for the reaction.
[2 marks]
(d) Based on the experiment, what is meant by the heat of neutralisation?
…………………………………………………………………………….......
[1 mark]
(e) The pupil repeats the experiment by replacing hydrochloric acid with
ethanoic acid. All the other conditions remain unchanged.
(i) Predict the value of the heat of neutralisation?
…………………………………………………………………….........
[1 mark]
(ii) Explain why?
………………………………………………………………………........
...………………………………………………………………………….
………………………………………………………………………........
....................................................................................................................
[2 marks]
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Section B
[20 marks]
Answer any one question.
7 (a)
Explain why the pH values of these two acids are different.
[4 marks]
(b) The two solutions are tested with a dry red litmus paper and the results are
tabulated below:
Solution Observation
Ammonia in chloroform No change in colour
Ammonia in water Red litmus paper turns blue
Explain why only the aqueous ammonia solution turns red litmus paper
blue.
[5 marks]
(c) You are required to prepare dry zinc sulphate salt. The chemicals supplied
are
zinc nitrate solution
dilute sulphuric acid
sodium carbonate solution
Describe a laboratory experiment to prepare the salt. In your description,
include chemical equations involved.
[11 marks]
Type of acid Concentration pH value
Ethanoic acid 0.1 mol dm-3
3.0
Nitric acid 0.1 mol dm-3
1.0
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8 (a) What is meant by empirical formula?
[1 mark]
(b) A carbon compound contains 92.3% of carbon and 7.7% of hydrogen by
mass.
The relative molecular mass of this compound is 78.
Find the molecular formula of this compound.
[Relative atomic mass: C, 12; H, 1]
[5 marks]
(c) Describe how you could determine the empirical formula of magnesium oxide
in the laboratory. Your description should include
procedure of experiment
tabulation of result
calculation of the results obtained
[Relative atomic mass: O,16; Mg,24]
[14 marks]
Section C
[20 marks]
Answer any one question.
9 (a) Define oxidation and reduction in term of changes in oxidation number.
[2 marks]
(b) Based on electron transfer, explain the oxidation and reduction reaction in
(i) changing of Fe2+
ions to Fe3+
ions
(ii) changing of Fe3+
ions to Fe2+
ions
Use a suitable example for each of the reaction. Include half equations in
your anwers.
[8 marks]
(c)
Describe an experiment to prove the above statement by the transfer of
electrons at a distance. In your description, include
labelled diagram which shows the set up of apparatus
procedure of experiment
observations at both electrodes
[10 marks]
Electrical energy can be produced by redox reaction.
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10 (a) (i) What is a catalyst?
(ii) State two characteristics of a catalyst.
(iii) Name one chemical process and the catalyst used in industry.
[4 marks]
(b) State two factors other than catalyst which can affect the rate of reaction.
Based on collision theory, explain how the factors that you mentioned can
affect the rate of reaction.
[8 marks]
(c) Knowledge about the factors that affect the rate of reaction is very useful in
human life.
State two activities at home and explain how the knowledge about the factors
that affect the rate of reaction is applied in the activities mentioned.
[8 marks]
END OF QUESTION PAPER
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1
Untuk Kegunaan Pemeriksa
Soalan Markah
Penuh
Markah
Diperoleh
1 18
2 15
3 17
JUMLAH 50
Nama : ……………………………………………... Kelas : …...……
SEKTOR SEKOLAH BERASRAMA PENUH
KEMENTERIAN PELAJARAN MALAYSIA
_______________________________________________
PEPERIKSAAN PERCUBAAN SPM
2007
KIMIA
KERTAS 3
Satu jam Tiga Puluh Minit
JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU
1. Tuliskan nama dan tingkatan pada
ruang yang disediakan.
2. Calon dikehendaki membaca maklumat
di halaman 2.
Kertas soalan ini mengandungi 10 halaman bercetak
4541/3
Kimia
Kertas 3
Ogos
2007
1½ Jam
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INFORMATION FOR CANDIDATES
1. This question paper consists of three questions. Answer all questions.
2. Write your answers for Question 1 and Question 2 in the spaces provided in the question
paper.
3. Write your answer for Question 3 on the lined pages at the end of the question paper in
detail.
4. Show your working. It may help you to get marks.
5. If you wish to cancel any answer, neatly cross out the answer.
6. The diagrams in the questions are not drawn to scale unless stated.
7. Marks allocated for each question or part question are shown in brackets.
8. The time suggested to answer Question 1 and Question 2 is 45 minutes and Question 3 is
45 minutes.
9. You may use a non-programmable scientific calculator.
10. Hand in this question paper at the end of the examination.
Marks awarded:
Mark Description
3 Excellent : The best response
2 Satisfactory : An average response
1 Weak : An inaccurate response
0 No response or wrong response
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Answer all questions
The time suggested to answer Question 1 and Question 2 is 45 minutes.
1. An experiment was carried out to investigate the effect of the size of the marble chips on
the rate of reaction. A burette was filled with water and inverted in a basin containing
water. The initial burette reading was recorded.
5.0 g of large marble chips were placed in a conical flask. 50 cm3 of 0.1 mol dm
-3
hydrochloric acid, HCl was added into a conical flask. The conical flask was closed with
a stopper fitted with a delivery tube directed to the burette and the stop-watch was started
simultaneously. The burette reading was recorded at 30-seconds intervals.
Experiment was repeated by using 5.0 g of small marble chips.
Diagrams below show the burette readings for the experiment between large marble chips
with hydrochloric acid.
(a) Record the volume of carbon dioxide gas in the spaces provided
Burette reading
……… cm3 at 0 min
50
49
48
Burette reading
……… cm3 at ½ min
41
40
39
Burette reading
……… cm3 at 1 min
32
31
30
Burette reading
……… cm3 at 2 min
6
20
19
18
Burette reading
……… cm3 at 1½ min
25
24
23
Burette reading
……… cm3 at 2½ min
16
15
14
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[3 marks]
(b) Construct a table showing the changes of time, burette readings and volumes of
carbon dioxide gas liberated for the experiment.
[3 marks]
Burette reading
……… cm3 at 3 min
6
12
11
10
Burette reading
……… cm3 at 4 min
9
8
7
Burette reading
……… cm3 at 4½ min
9
8
7
Burette reading
……… cm3 at 5 min
9
8
7
Burette reading
……… cm3 at 3½ min
6
10
9
8
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5
(c) Table 1 shows the volume of carbon dioxide gas liberated when the experiment
was repeated by using 5.0 g of small marble chips.
Time /min
0 ½ 1 1 ½ 2 2 ½ 3 3 ½ 4
Volume of
carbon dioxide /
cm3
0.00 20.00 29.00 35.00 38.00 40.00 41.50 41.50 41.50
TABLE 1
Based on the data in (b) and Table 1, draw the graphs volume of carbon dioxide
gas liberated against time for both experiments on the same axes.
[3 marks]
(d) State the relationship between the size of marble chips and the rate of reaction?
…………………………………………………………………………........
………………………………………………………………………………
………………………………………………………………………………
[3 marks]
(e) Meat which is cut into small pieces takes a shorter time to cook compared to meat
that is cut into big pieces. Explain why?
………………………………………………………………………………
………………………………………………………………………………
………………………………………………………………………………
[3 marks]
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(e) Complete the table below based on the experiment.
Name of variables Action to be taken
(i) Manipulated variable
............................................................
............................................................
............................................................
(i) The way to manipulate variable
........................................................
.........................................................
.........................................................
(ii) Responding variable
............................................................
............................................................
.............................................................
(ii) What to observe in the
responding variable
.........................................................
..........................................................
(iii) Fixed variable
.............................................................
.............................................................
............................................................
(iii) The way to maintain the fixed
Variable
.........................................................
.........................................................
[3 marks]
2 Diagram 2 shows the set-up of apparatus for an experiment to construct the
electrochemical series by measuring the potential difference of a few pairs of
copper and metal M in a simple voltaic cell using 1.0 mol dm-3
copper(II) sulphate
solution as an electrolyte.
DIAGRAM 2
Copper(II) sulphate
solution
Copper Metal M
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The result gained is shown in the table 2
Cell Metal pairs
Cu / M Voltage cell / V Negative terminal
I Cu / Fe 0.8 Iron, Fe
II Cu / Al 2.1 Aluminium, Al
III Cu / Mg 2.7 Magnesium, Mg
IV Cu / Zn 1.1 Zinc, Zn
V Cu / Cu 0.0 Copper, Cu
TABLE 2
(a) State a hypothesis of the experiment.
………………………………………………………………………………
………………………………………………………………………………
[3 marks]
(b) Based on Table 2, arrange all the metals according to descending order of
electropositivity.
………………………………………………………………………………
[3 marks]
(c) What is the inference that can be made from voltage cell V.
…………………………………………………………………………........
………………………………………………………………………………
………………………………………………………………………………
[3 marks]
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(d) The diagram below shows simple voltaic cell IV before and after an experiment.
What can you observed in cell IV?
…………………………………………………………………………........
………………………………………………………………………………
………………………………………………………………………………
[3 marks]
(e) Predict the voltage cell if zinc and aluminium are used to construct
electrochemical series.
………………………………………………………………………………
[3 marks]
Copper Zinc
Copper(II) sulphate
Solution (blue colour)
Copper Zinc
Copper(II) sulphate
Solution (light blue)
Before experiment
After experiment
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3
You are given the iron nails, magnesium ribbon, zinc strip, copper strip and tin strip.
Referring to the situation above, plan a laboratory experiment to investigate the effect of
other metals on the rusting of iron.
Your planning should include the following aspects:
(a) Statement of the problem
(b) All variables
(c) Statement of the hypothesis
(d) List of materials and apparatus
(e) Procedure of the experiment
(f) Tabulation of data
[17 marks]
END OF QUESTION PAPER
A more electropositive metal acts as a sacrificial metal which
corrodes itself to protect iron from rusting
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SPACE FOR YOUR ANSWER
Section: …………………………………… Question No.: ………………………….
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………………………………………………………………………………………………
SPACE FOR YOUR ANSWER
Section: …………………………………… Question No.: ………………………….
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4541/1
Kimia
Kertas 1
Ogos
2007
BAHAGIAN SEKOLAH
KEMENTERIAN PELAJARAN MALAYSIA
______________________________________________
PEPERIKSAAN PERCUBAAN SPM 2007
KIMIA
Peraturan pemarkahan Kertas 1, 2 dan 3
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2
Peraturan pemarkahan ini mengandungi halaman bercetak.
Kertas 1
1 A 21 B 41 A salah
Bbetul
2 B 22 D 42 A
3 A 23 D 43 C
4 B 24 C 44 B
5 B 25 B 45 B
6 C 26 C 46 B
7 D 27 D 47 B
8 A 28 A 48 A
9 Bsalah Dbetul 29 D 49 C
10 C 30 A 50 B
11 B 31 B
12 A 32 C
13 A 33 C
14 A 34 B
15 A 35 D
16 D 36 A
17 D 37 A
18 D 38 C
19 B 39 A
20 C 40 C
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3
Kertas 2-Bahagian A
No. Rubric Mark
1
(a)
(b)
(c)
(d)
(e)
P: liquid
S: solid
1. Particles of Q held together by weak intermolecular forces
2. A small/less amount of heat energy is required to overcome
Diagram
1. label
2. functional apparatus
1. label of axis
2. shape of graph
1
1
1
1
1
1
1
1
1…9
2
(a)(i)
(ii)
(b)
(c)
(d)
(e)(i)
2.8.3 // 2,8,3 reject 2: 8: 3
F+3
// F3+
A,D,C,B,G,F,E
Atom A has a stable/duplet electron arrangement/2 valance electron
octet - reject
1. Size of atom D is smaller than G // G is bigger
2. Strength of the nucleus of atom D to attract electron increase
Ionic/ ionic compound
reject – ionic bond
1
1
1
1
1
1
1
Time ( min)
Temperature / oC
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4
(e)(ii)
(e) (iii)
1. Number of shells and electrons
2. Charge
- has high melting point and boiling point
- conduct electricity in molten state or aqueous solution
reject – can conduct electricity
- soluble in water
- insoluble in organic solvent
(Any one)
1
1
1...10
3
(a)
(b) (i)
(ii)
(iii)
(iv)
(c) (i)
(ii)
(iii)
(iv)
(d)
H+
, Cu
+2
Copper/cathode electrode becomes thicker//brown solid is deposited
Cu+2
+ 2e Cu
Copper // metal/ electrode [reject copper ion// copper solution]
Oxygen gas [ reject water]
(from zinc plate to copper plate)
Oxidation
0 to +2 //0 +2
Increases / deflect more / higher
Zn + Cu+2
Cu + Zn+2
1
1
1
1
1
1
1
1
1
1...10
4
(a)
(b) (i)
(ii)
(c) (i)
Boron oxide
Tin
1. The presence of tin atoms of different size from the atoms of
copper distrupts the orderly arrangements of copper atoms
2. This prevents the layers of atoms from sliding over one another
easily
H Cl
| |
C == C
| |
H H
1
1
1
1
1
-
D
-
D E
x x x
x x x
2+
x x x x
x x
5
(ii)
(d)
(e) (i)
(ii)
Does not corrode / rust
Reinforced concrete
2NH3 + H2SO4 (NH4)2SO4//
2NH4OH + H2SO4 (NH4)2SO4 + 2H2O
% N in CO(NH2)2 = %67.46%10060
)14(2
% N in (NH4)2SO4 = %21.21100132
)14(2
Urea has higher percentage of nitrogen so it is more suitable for
the growth of plants
1
1
1
1
1
1…11
5
(a)
(b)(i)
(ii)
(c)(i)
(ii)
(d)(i)
(ii)
J: alkene
K: alcohol
Butan-2-ol
Hydration/addition of steam [reject – dehydration / hydrogenation]
Orange to green
C3H7COOH
C4H8 + 6O2 4CO2 + 4H2O
No of mole C4H8 = )1(8)12(4
6.5
= 56
6.5
= 0.1
1 mole of C4H8 4 mole CO2
0.1 mole of C4H8 0.4 mole CO2
Volume of CO2 = 0.4(24)
= 9.6 dm3 / 9600 cm
3
1
1
1
1
1
1
1
1
1
1…10
6
(a)
(b)(i)
Reduce heat released to the surrounding/ to prevent heat lose
Heat change = 200 x 4.2 x 13
= 10920 J
1
1
6
(b)(ii)
(c)
(d)
(e)(i)
(ii)
Mole of H+/OH
-/water = 100 x 2.0 // 0.2 mol
1000
Heat of displacement = - 10920 J // -54.6 kJmol-1
0.2 mol
1. Label the energy axis & correct energy level of the reactants and
product
2. Correct chemical equation// ionic equation
Heat released/ produced when 1 mol of water is formed
decreases / less / lower
1. Ethanoic acid is a weak acid
2. Some of the heat given out during the neutralization is used to
ionize/dissociate the ethanoic acid // absorb back
1
1
1
1
1
1
1
1…10
H+ + OH
-
H2O
Energy
7
Essay
No. Rubric Mark
7
(a)
1. pH value of ethanoic acid is higher than nitric acid
2. ethanoic acid is a weak acid; nitric acid is a strong acid
3. ethanoic acid ionises partially in water to produce lower
concentration of hydrogen ion
4. nitric acid ionises completely in water to produce higher
concentration of hydrogen ion
1
1
1
1…4
(b)
1. ammonia exist as molecule in chloroform
2. there are no hydroxide ions present; the solution is not alkaline
3. when ammonia ionises partially in water to produce hydroxide ion
4. NH3 + H2O NH4+ + OH
-
5. the presence of OH- ions makes the solution alkali
1
1
1
1
1…5
(c)
1. Pour [20-100]cm3 of zinc nitrate solution [0.1-1.0]mol dm
-3 into a
beaker
2. Add [20-100]cm3 of sodium carbonate solution [0.1-1.0]mol dm
-3
3. Stir and filter the mixture
4. Pour [20-100]cm3 dilute/[0.1-1.0]mol dm-3
sulphuric acid into a
beaker
5. Add the residue/precipitate into the acid until in excess
6. Stir and filter the mixture
7. Heat the filterate until saturated/1/3 of original volume
8. Cool the saturated solution
9. Filter and dry the crystal
10. Zn(NO3)2 + Na2CO3 ZnCO3 + 2NaNO3
11. ZnCO3 + H2SO4 ZnSO4 + H2O + CO2
1
1
1
1
1
1
1
1
1
1
1...11
20
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8
No. Rubric Mark
8
(a)
Formula that shows the simplest ratio of the number of atoms for
each element in the compound.
1…1
(b)
Empirical formula : CH
RMM of (CH)n = 78
[ 12 + 1]n = 78
13 n = 78
n = 6
Molecular formula : C6H6
Element C H
Mass (%) 92.3 7.7
Number of
moles 12
3.92 = 7.7
1
7.7 = 7.7
Ratio of moles 1 1
1
1
1
1
1…5
(c)
Procedure:
1. Clean magnesium ribbon with sand paper
2. Weigh crucible and its lid
3. Put magnesium ribbon into the crucible and weigh the crucible
with its lid
4. Heat strongly the crucible without its lid
5. Cover the crucible when the magnesium starts to burn and
lift/raise the lid a little at intervals
6. Remove the lid when the magnesium burnt completely
7. Heat strongly the crucible for a few minutes
8. Cool and weigh the crucible with its lid and the content
9. Repeat the processes of heating, cooling and weighing until a
constant mass is obtained
10. Record all the mass
Results:
Mass/g
Crucible + lid x
Crucible + lid + magnesium y
Crucible + lid + magnesium oxide z
1
1
1
1
1
1
1
1
1
1
1
9
Calculatio
ns:
Empirical formula: MgaOb / MgO
Element Mg O
Mass (g) y-x z-y
Number of moles 24
xy
16
yz
Simplest ratio of moles a b
1
1
1...14
20
No. Rubric Mark
9
(a)
1. Oxidation - increase in oxidation number
2. Reduction – decrease in oxidation number
1
1…2
(b)(i)
1. Fe+2
Fe+3
+ e
2. Br2 + 2e 2Br –
3. Iron(II) ions lose electrons to become iron(III) ions. Iron(II) ions
are oxidised
4. Bromine molecules gain electrons to form bromide ions.
Bromine molecules are reduced
(a: any suitable reducing agent)
1. Fe+3
+ e Fe+2
2. Zn Zn+2
+ 2e
3. Iron(III) ions gain electrons to become iron(II) ions. Iron(III)
ions are reduced
4. Zinc atoms lose electrons to form zinc ions. Zinc atoms are
oxidised
(a: any suitable reducing agent)
1
1
1
1
1
1
1
1…8
10
(c)
Diagram:
1. label
2. functional apparatus
Procedure:
1. Pour dilute sulphuric acid into a U-tube
2. Using a dropper, add iron(II) sulphate solution at one side
3. and acidified potassium manganate(VII) solution at another side
4. Place carbon electrode in each side of the U-tube
5. Connect the electrodes to a galvanometer by using connecting
wires//Complete the external circuit
6. Record any change that can be observed after a few minutes
Observations:
The green colour of iron(II) solution turns to brown
The purple colour of acidified potassium manganate(VII) solution is
decolourised/change to colourless
(a: any suitable cell)
1
1
1
1
1
1
1
1
1
1…10
20
No. Rubric Mark
10 (a) (i)
Catalyst is a substance that changes the rate of a chemical reaction.
1
(a) (ii)
- does not change the amount of product formed.
- unchanged chemically at the end of reaction.
- the amount of catalyst is the same before and after the reaction.
- it is specific for a reaction.
- only small amount is needed to catalyze a reaction.
- less effective when there are impurerities.
- most of the catalyst are transition metals or their compound.
(Any two)
1
1…2
(a) (iii)
- Haber process: iron filling
- Contact process: vanadium(V) oxide
- Ostwald process: platinum
1…1
11
(Any one)
(b)
1 Size of reactant
- size of reactant decrease, total surface area exsposed for collision
between the particles reactants increase
- frequency of collision between particles increase
- frequency of affective collision increase
rate of reaction increase
2 Concentration of reactant
- concentration of a solution increase, number of particles per unit
volume increase
- frequency of collision between particles increase
- frequency of affective collision increase
rate of reaction increase
3 Temperature of reaction
- temperature of reactants increase, kinetic energy of particles
reactants increase
- frequency of collision between particles increase
- frequency of affective collision increase
rate of reaction increase
(Any two)
1
1
1
1…4
1
1
1
1…4
1
1
1
1…4
(c)
1 Cooking of solid food
- solid food cut into small piece
- total surface area exsposed to heat increase
- food cook faster
2 Cooking of food in a pressure cooker
- high pressure raises the boiling point of water.
- cooking is carried out at a temperature higher than 100 o C.
- food cook faster.
3 Storing of food in a refrigerator
- temperature in refrigerator is lower
- microorganisms inactive
- slow down rate of food decaying
(Any two)
(a: any suitable answer than above)
1
1
1
1…4
1
1
1
1…4
1
1
1
1…4
20
12
PAPER 3
1 ( a )
Score Rubric
3 [ Able to state all 11 readings correctly ]
2 decimal places
Unit cm3
Suggested answer
49.60, 40.10, 31.50, 24.10, 19.50, 15.10, 11.50, 9.60, 8.10, 8.10. 8.10
2 [ Able to state any 8 readings correctly ]
1 [ Able to state any 4 readings correctly ]
0 No response or wrong response
1 (b)
S
core
Rubric
3
[Able to design a table and record the time, buret reading and volume of gas liberated]
1. Time /minute
2. Buret reading /cm3
3. Volume of gas liberated
Suggested answer:
Time
/min
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Buret
reading
/cm3
49.60 40.10 31.50 24.10 19.50 15.10 11.50 9.60 8.10 8.10 8.10
Volume
of gas /
cm3
0.00 9.50 18.10 25.50 30.10 34.50 38.10 40.00 41.50 41.50 41.50
2
[Able to design a table and record two of the 3 items (time, buret reading and volume of
gas liberated] // [Able to design table without unit]
1
[Able to give idea on table ]
Suggest answer: 2 rows x 11 columns
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13
1 (c)
Score Rubric
3 [ Able to draw 2 graphs of volume of carbon dioxide gas liberated against time
for both experiments on the same axes with all the 4 items below correctly ]
(i) suitable scale used
(ii) axes labelled correctly
(iii) all points plotted correctly
(iv) smooth curve of graphs
2 [Able to draw the graphs of volume of carbon dioxide gas liberated against
time for both experiments on the same axes with at least 3 items correctly] //
[Able to draw one of the graphs volume of carbon dioxide gas liberated against
time with at least 4 items abovebelow correctly]
1 [ Able to manipulate two items correctly ]
0 No response or wrong response
1 ( d )
Score Rubric
3 [Able to deduce the relationship between the size of marble chips and the rate of
reaction correctly].
Suggested answer:
Small pieces of marble chips have a large total surface area than that a large
pieces of marble chips of the same mass, course the time taken for reaction
more faster / rate of reaction more higher
2 [Able to give incomplete relationship]
Suggested answer:
Small pieces of marble chips have a large total surface area time taken for
reaction more faster / rate of reaction more higher
1 [Able to give an idea ]
Suggested answer:
Small pieces of marble chips have a large total surface area // time taken for
reaction more faster when size of reactant smaller // rate of reaction depend on
the size of reactant
0 No response or wrong response
14
1 (e)
Score Rubric
3 [ Able to state three variables and the way to control them correctly ]
Example :
Manipulated variable :
Total suface area of marble
Replace large marble chips with
small small marble chips
Responding variable :
Rate of reaction // time
Measure the volume of gas collected
at half-minute interval
Fixed variable :
Mass of marble, volume of
hydrochloric acid, temperature
Use the same mass/5.0 g marble,
same volume/50 cm3 and
concentration/ 0.1 mol dm-3
hydrochloric acid, same tepperature
in each of the experiment
2
[ Able to state any pair of variable and action correctly ]
1 [ Able to state any variable and any action correctly // any two variables
correctly // any two action correctly]
0 No response or wrong response
1 (f)
Score Rubric
3 [Able to state relationship small pieces of meat and time to cook correctly]
Suggested answer
Smaller pieces of meat has bigger total surface area
The larger surface area provides a larger area for absorbtion heat
Increased obsorption of heat shorten cooking time// The rate of reaction
increases
2 [Able to give incomplete relationship ]
Suggested answer
[state the any two items above]
1 [Able to give an idea // state any one items above]
0 No response or wrong response
15
2 (a)
Score Rubric
3 [Able to give the hypothesis accurately]
Suggested answer :
The further the metal is from copper in the electrochemical series, the greater
is their potential different/ voltage reading. //
The further apart the metal is in the electrochemical series, the greater the
potential different/ voltage reading.
2 [Able to give the hypothesis almost accurately]
Suggested answer :
The further the metal is from copper in the reactivities series, the greater is
their potential different/ voltage reading. //
The further apart the metal is in the reactivities series, the greater the potential
different/ voltage reading.
1 [Able to state an idea of hypothesis]
Suggested answer :
The position of metal influence the different potential/ voltage reading.
Type of metal influence the different potential/ voltage reading.
0 No response or wrong response
2 (b)
Score Rubric
3 [Able to arrange all the 5 metals according to descending order of
electropositivity correctly]
Suggested answer:
Magnesium, Aluminium, Zinc, Iron, Copper
[a: formula]
2 [Able to arrange all the 4 metals but according to increasing order of
electropositivity correctly]
Example:
Mg, Al, Fe, Cu, Zn // Al, Zn, Fe, Cu, Mg // Al, Zn, Mg, Fe, Cu
1 [Able to arrange all the 5 metals but according to ascending order of
electropositivity correctly]
Example ;
Cu, Fe, Zn, Al, Mg
16
0 No response or wrong response
2 (c)
Score Rubric
3 [Able to state inference correctly].
Suggested answer
Electrical energy is not produced
No movement of electron because the same type of metal are used as
electrodes in a voltaic cell
2 [Able to state inference not completely].
Suggested answer
Electrical energy is not produced // no movement of electron because the same
type of metal are used as electrodes in a voltaic cell
1 [Able to state an idea]
Example
No electric/electron/potential difference
0 No response or wrong response
2 (d)
Score Rubric
3 [Able to state three observations correctly]
Suggested answer:
1 Zinc dissolved // becomes thinner
2 Copper becomes thicker // brown solid deposited
3 Blue solution becomes light blue /fading in colour
2 [Able to state two observation correctly]
1 [Able to state one observation/idea about observation of the cell]
0 No response given or wrong response
17
2 (e)
Score Rubric
3 [Able to predict correctly]
Answer: 1.0 V
2 [Able to predict almost correctly]
Example:
1.0
1 [Able to state an idea to arrange the metals]
Example:
Reading is higher than 0.5 / lower than 1.5
0 No response or wrong response
Essay
3 (a) - Statement of the problem
Score Rubric
3
[ Able to give the statement of problem correctly ]
Example :
How the effect on rusting when iron is in contact with another metals?
2
[ Able to give the statement of problem incorrectly ]
Example :
To investigate the effect of other metals on the rusting of iron
1
[ Able to state an idea the statement of problem]
Example :
To study the rusting of iron
0 [ No response or wrong response]
18
3 (b) - variables
Score Rubric
3
[ Able to state All variables correctly ]
Suggested answer :
Manipulated variable : Different types of metals// Different metals
Responding variable : Rate of rusting // Rusting of iron
Constant variable : Iron nails/temperature
2
[ Able to state any two variables correctly ]
1
[ Able to state any one variables correctly ]
0 [ No response or wrong response]
3 (c) - hypothesis
Score Rubric
3 [Able to give the hypothesis accurately]
Suggested answer :
When a more electropositive metal is in contact with iron, the metal inhabits
rusting // When a less electropositive metal is in contact with iron, the metal
speed up rusting // Iron rusts faster when in contact with metal less
electropositive
2 [Able to give the hypothesis almost accurately]
Suggested answer :
When a more reactive metal is in contact with iron, the metal inhabits rusting
1 [Able to state an idea of hypothesis]
Suggested answer :
When a less electropositive metal is in contact with iron, the metal inhabits
rusting
0 No response or wrong response
19
3 (d) - Apparatus and materials
Score Rubric
3
[ Able to give the list of the apparatus and substances correctly and
completely]
Suggested answer :
Apparatus : Five test tubes, test tube rack
Materials : sand paper, five iron nails, magnesium strip, zinc strip, tin strip,
copper strip, hot agar-agar/jelly solution mixed with potassium
hexacyanoferrate(III) solution and phenolphthalein indicator
2
[ Able to give the list of the apparatus and substances correctly and but not
completely]
Example :
List of apparatus and materials
Test tube, iron nail, magnesium,zinc, tin,copper,water, potassium
hexacyanoferrate(III) / phenolphthalein indicator
1
[ Able to give an idea about the list of the apparatus and materials correctly]
Example :
Any one apparatus and two materials
0 [No response or wrong response]
3 (e) - Procedure of the experiment
Score Rubric
3
[ Able to state all procedures correctly ]
Suggested answer :
1. Clean all the metal strips with sand paper
2. Coil the metal strip around the iron nails and then put in the each test tube
3. Pour the same volume of hot agar-agar/jelly solution has been mixed with
potassium hexacyanoferrate(III) and phenolphthalein indicator
4. Leave the test tubes aside for one day
5. Compare the intensity of the blue and pink colour in each test tube and
recorded
2 [ Able to state 3 steps of procedures correctly ]
Example : Steps 2,3,5
20
1 [ Able to state 2 steps of procedures correctly ]
Steps 2,3
0 [No response or wrong response]
3 (f) - Tabulation of data
Score Rubric
3
[ Able to exhibit the tabulation of data correctly ]
Tabulation of data has 6 columns and 3 rows
Example :
Test tube A B C D E
Intensity of
blue colour
Intensity of
pink colour
2
[ Able to exhibit the tabulation of data less accurately ]
Tabulation of data has 6 columns and 2 rows
Example :
Test tube A B C D E
Observation
1
[ Able to state an idea about the tabulation of data ]
Tabulation of data has 2 columns and 2 rows
0
[No response or wrong response]
Total 3 × 6 = 18
Max 17
Nota utk pemeriksa*
Markah Kertas 1 + Markah Kertas 2 + Markah Kertas 3 = Markah keseluruhan
2
50 + 100 + 50 = 100%
2 http://cikguadura.wordpress.com/