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4541/1 [Lihat sebelahSULIT
SULIT 4541/1
4541/1ChemistryPeper 1Oktober 2009
1 1/4 jam
PEJABAT PELAJARAN DAERAH MELAKA TENGAH_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
CHEMISTRY
Paper 1
Satu jam lima belas minit
JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU
1. Kertas soalan ini mengandungi 50 soalan
2. Jawab semua soalan
3. Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan
4. Hitamkan satu ruangan sahaja bagi setiap soalan
5. Rajah tidak dilukis mengikut skala kecuali dinyatakan
6. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan
Kertas soalan ini mengandungi 20 halaman bercetak.
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1 The figure below shows the set-up of the apparatus to study Process I
W
A
B
C
D
2 W
A
B
C
D
1 [Lihat sebelahSULIT
hat is Process I ?
Condensation
Evaporation
Diffusion
Sublimation
hat is the definition of a mole ?
The volume occupied by 6.02 X 1023 particles
The atomic mass of a substance which consists of 6.02 X 1023 atoms
The molecular mass of a substance which consists of 6.02 X 1023 molecules
The quantity of substance which has the same number of particles as the
number of atoms in 12 g of Carbon-12
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3 The figure below shows the heating curve for substance N
Which of the following gives the correct states of substance N at X, Y and Z asshown in the graph?
A
B
C
D
X Y Z
solid liquid gas
solid solid and liquid gas
solid solid and liquid liquid
liquid liquid and gas solid
4 Which of these is the correct sequence of scientific method of investigation ?
A
B
C
D
Observation → inference → determining the variables → doing experiment
Analysing data → collecting data → making conclusion → identifying problem
Hypothesis → doing the experiment → conclusion → inference
Doing the experiment → hypothesis → analysing data → inference
TemperatureoC
Z
Y
X
Time/s
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5 When steam condenses, the particles
A
B
C
D
become smaller size
lose energy to their surroundings
move futher apart
vibrate about fixed positions
6 The figure below shows an electron arrangement of Y2+
How many
A
B
C
D
Proto
8
12
12
8
7 What can w
A
B
C
D
An ato
An ato
Helium
Helium
protons and electrons does an atom of Y contain ?
n Electron
8
10
12
10
e deduce from the symbol
m of helium contains two e
m of helium has two proton
has a proton number of 4
occurs as a diatomic mole
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?
lectrons
s and four neutrons in its nucleus
cule
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8 The relative formula mass of ammonium phosphate, (NH4)3PO4 is[ Relative atomic mass of H=1, N=14, O=16 and P=31]
A
B
C
D
133
141
149
159
9 Rouge is a pigment which contains 2.8 g of iron combined with 1.2 g of oxygen.What is the chemical formula of rouge ?[ Relative atomic mass of Fe=56 and O=16 ]
A
B
C
D
FeO
Fe2O3
Fe3O2
Fe3O4
10 A metal X can exist as X2+ and X3+ ions. The possible formulae for its sulphateswould be
I XSO4
II X2SO4
III X2(SO4)3
IV X3(SO4)2
A
B
C
D
I and II only
I and III only
II and III only
II, III and IV only
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11 Which of the following electron arrangements is found in an atom of a noble gas?
A
B
C
D
1
2.1
2.8
2.8.2
12 The following table shows the proton number and nucleon number of atom X
Which of th
A
B
C
D
Group
1
17
1
17
13 The table bElements.
Which of th
A
B
C
D
The a
Atom
The n
Atom
Proton number 9
e following shows the position of X in the Periodic Table of elements?
Period
4
2
1
4
elow shows the position of 2 elements, P and Q, in the Periodic Table of
e
to
s o
um
s o
Nucleon number 19
Elements Group PeriodP 1 3
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following is true about elements P and Q ?
ms of P are smaller than the atoms of Q
f P have stronger attraction for other electrons
ber of positive charges in the nucleus of P is less than Q
f Q have a higher tendency than P to release electrons
Q 17 3
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14 The chemical symbol of an element T is as shown :
What would be the electron arrangement of the ion formed by an atom of T ?
A
B
C
D
2.8
2.8.2
2.8.8
2.8.8.8
15 The electron arrangement of atom X = 2.8.7. What is the formula of the ion formedfrom X ?
A
B
C
D
X-
X+
X7-
X7+
16 The electron arrangements of 2 atoms X and Y are as shown :
Whic
A
B
C
D
12
X
h of the following is true wh
X receives electrons
Y receives electrons
The compound formed has
The compound formed is m
24
T
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Y
en X react with Y?
a formula of XY2
ade up of molecules
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17 The proton numbers of a few elements are as shown :
With the atoms oelectrons?I HII NaIII MgIV SA
B
C
D
I only
II only
II and III on
I and IV on
18 It is discovered thcan you make ab
A
B
C
D
It is not a c
The compo
The compo
The interm
Element Proton NumberH 1Na 11Mg 12
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S 16
f which element would chlorine atoms combine by sharing
ly
ly
at a compound with formula WZ dissolves in water. What inferenceout the compound ?
ovalent compound
und ionizes in water
und will not dissolve in an organic solvent
olecular forces between the particles are very weak
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19 The following diagram shows the apparatus set up for an elelctrolysis.
Which of the f
A
B
C
D
Ammoni
Sodium C
Ethanoic
Ether
20 An experimenX, Y and Z inresults are as s
Which of the fdescending ord
A
B
C
D
X, Y, Z
Y, X, Z
Z, X, Y
Z, Y, X
X +X +Y +Z +
E
ollowing cannot be E ?
um hydroxide
hloride
acid
t has been carried out to determine the relative position of three metalsthe electrochemical series by using the displacement reaction. Thehown :
Mixture Resultssolution of Y Y depositedsolution of Z No reactionsolution of Z No reaction
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ollowing shows the correct relative position of X, Y and Z iner of tendency to release electrons?
solution of Y Y deposited
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21 Which of the following compounds is a soluble base?
A
B
C
D
Aluminium oxide
Copper(II) oxide
Iron(III) oxide
Sodium oxide
22 The pH scale below shows the position of five aqueous solutions P, Q, R, S and T, ofequal concentration.
P Q R S T
1 7 14pH Scale
What could the aqueous solutions be ?
A
B
C
D
Ethanoic sulphuric ammonia sodium sodium
acid acid aqueous chloride hydroxide
P Q R S T
Q P S R T
Q P T S R
S T Q R P
23 What is the concentration of hydrogen ions in 0.05 mol dm-3 sulphuric acid?
A
B
C
D
0.025 mol dm-3
0.050 mol dm-3
0.100 mol dm-3
0.250 mol dm-3
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24 Which of the following equations best represents the actual reaction betweenhydrochloric acid and sodium hydroxide solution?
A
B
C
D
H+ + OH- H2O
H2 + ½ O2 H2O
2H+ + O 2- H2O
Na+ + Cl- NaCl
25 The neutralization reaction between nitric acid and barium hydroxide solution isshown in the equation below
2HNO3 + Ba(OH)2 Ba(NO3)2 + 2H2O
10.0 cm3 of 0.1 mol dm-3 barium hydroxide solution was titrated with 0.1mol dm-3
of nitric acid . What is the volume of the nitric acid?
A
B
C
D
10 cm3
20 cm3
30 cm3
40 cm3
26 Air polluted by sulphur dioxide was passed through the apparatus shown in thediagram below.
Which of the follosulphur dioxide?
A
B
C
D
acidified pot
aqueous iron
aqueous pota
limewater
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wing solutions could be used as Z to show the presence of
assium manganate(VII)
(II) sulphate
ssium iodide
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27 The following scheme shows four stages in the conversion of sulphur to sulphuricacid. In which stage is the catalyst used?
28 Which of the following mixtures of elements forms the most suitable alloy formanufacturing of racing bicycle which is light and firm?
A
B
C
D
copper and nickel
iron and carbon
stanum and copper
aluminium and copper
29 Which of the following pairs shows the correct monomer for making the respectivepolymer?
A
B
C
D
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30 The followings are the properties of glass. Which of the followings are true?
I low melting point.
II they are good insulators of heat.
III resistant to chemicals
IV hard but brittle
A
B
C
D
I and II only
III and IV only
I, III and IV only
II, III and IV only
31 Compound A is an organic compound. When heated strongly, which of the followinggases is released?
A
B
C
D
Oxygen
Hydrogen
Carbon dioxide
Ethane
32 The following chemical equations show two chemical reactions that took place.
Which of the following shows the correct reaction represented by X and Y ?
X CH2CHCH2CH3 +H2 CH3CH2CH2CH3
Y CH2CHCH2CH3 +H2O CH3CH(OH)CH2CH3
A
B
C
D
X Y
Hydration Hydrogenation
Hydrogenation Hydration
Substitution Dehydration
Oxidation Reduction
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33 Which of the following is the IUPAC name for the structural formula shown
below?
A
B
C
D
3-ethyl-4-methylheptane
4-methyl-2-ethylhexane
5-ethyl-3-methylheptane
2-ethyl-4-methylhexane
34 Which of the following is correct regarding the physical properties of pentene,C5H10?
A
B
C
D
Pentene is denser than hexene.
Pentene exists in the form of gas at room temperature
Complete combustion of pentene will produce 4 moles of carbon dioxide gas.
Pentene is insoluble in water but is soluble in organic solvent.
35 Which of the following best explains the statement below?
Combustion of hexene is sootier than that of hexane
A
B
C
D
Hexane molecule has more hydrogen atoms than hexene molecule.
The van der Waals’ forces between hexene molecules are stronger.
Percentage by mass of carbon in hexene molecule is higher than that in hexane
molecule.
The size of hexene molecule is larger.
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36 In a reaction temperature will increase the rate of reaction because it will
A
B
C
D
lower the activation energy of the rection
increase the energy of particles involved in the reaction
decrease the effective collision of particles involved
increase the rate of collision among the particles
37 The table shows the volume of oxygen gas obtained at regular intervals for thedecomposition of hydrogen peroxide, H2O2
Time(min) Volume of oxygen gas (cm3)
0 0
1.0 5.5
2.0 10.0
3.0 14.0
4.0 17.5
5.0 20.0
The everage rate of decomposition of hydrogen peroxide from the second minute to
the fourth minute is
A
B
C
D
17.5 cm3 min-1
12.5 cm3 min-1
3.75 cm3 min-1
4.17 cm3 min-1
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38 The graph below shows the volume of gas produced against time for the reaction ofpotassium carbonate and hydrochloric acid
The gradient of the graph decreases with time because
A
B
C
D
catalyst is not used
temperature of reaction decreases
volume of mixure decreases
concentration of hydrochloric acid decreases
39 Which of the following will increase the frequency of collision?
I Use reactant with larger size
II Increase the concentration of reactant
III Increase the temperature of reaction
IV Remove the product of reaction
A
B
C
D
IV only
II and IV only
II and III only
I, III and IV only
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40 The equation below shows one of the reaction to produce hydrogen gas
2HCl + Zn ZnCl2 + H2
Which of the following would increase the rate of production of hydrogen gas?
A
B
C
D
Increase the time of reaction
Increase the volume of acid
Increase the size of granulated zinc
Increase the tempereture of the mixture
41 Which of the following chemicals can oxidise chloride ions to chlorine?
A
B
C
D
Potassium manganate (VII)
Iron(III) sulphate
Aqueous bromine
Potassium
42 Which of the following is an oxidising agent?
A
B
C
D
Hydrogen gas
Potassium manganate(VIl)
Potassium Iodide
Ammonia
43
Which ofabove s
A
B
C
D
Psych
Horm
Analg
Antib
A patient claims that other people are reading his mind
[Lihat sebelahSULIT
the following types of medicine is most appropriate in treating theymptoms
otherapeutic medicine
ones
esic
iotics
and controlling his thoughts
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44 A series of experiment was carried out to investigate the reactivity ofmetals X, Y and Z. The following results were obtained.
Mixture ResultX+ oxide of Y No reaction.
Y+ oxide of Z Reaction occurred.
X + oxide of Z Reaction occurred.
Which of the following is the correct sequence of the metals in descending order ofreactivity?
A
B
C
D
X, Y, Z
Z, X, Y
Y, Z, X
Y, X, Z
45 The figure bellow shows the energy profile diagram for a reaction between X and Yto produce Z.
What is the heat of reaction?
A
B
C
D
E2 – E1
E1 – E2
E3 – E1
E3 – E2
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46 Which of the following is an exothermic reaction?
A
B
C
D
The heating of hydrated copper(II) sulphate
The heating of sodium thiosulphate
Dissolving ammonium chloride in water
Rusting process
47 The figure below shows the change in the heat of combustion of a few alcohols.
The increase in the heat of combustion of alcohols as shown is due to
ABCD
an increase in the sootiness of the alcohols when burntan increase in the reactivity of alcoholsan increase in the relative molecular massan increase in the number of carbon and hydrogen atoms per molecule ofalcohol
48 Which of the following pairs regarding traditional medicines and their uses iscorrect?
A
B
C
D
Traditional medicine UseEurycoma longifolia To relief asthmatic attack
Aloe vera To treat skin wounds
Garlic To treat stomach wind
Ginseng To treat malaria
Propanol ( C3H7OH )
Ethanol ( C2H5OH )
Methanol ( CH3OH )
Heat ofcombustionincreases
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Detergent is more effective for washing in hard water, but soap is very often used ineveryday life. The advantage of soap over detergent is that
soap is more effective for washing in acidic water compared to detergent
soap has a fragrant smell where as detergent has a pungent smell
soap is biodegradable where as many detergents are not
soap is cheaper than detergent.
50 Which of the following is one of the possible products formed when palm oil isboiled in concentrated sodium hydroxide solution ?
I Sodium chlorideII GlycerolIII Sodium palmitateIV Sodium stearate
A
B
C
D
II and III only
I, II and III only
II, III and IV only
I, II, III and IV
KERTAS SOALAN TAMAT
49
A
B
C
D
SULIT4541/2 NameChemistryPaper 2 FormOctober 20092 1/2 hours
PEJABAT PELAJARAN DAERAH MELAKA TENGAH
_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
CHEMISTRYPaper 2
Two hours and thirty minutes
DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO
1. This question paper consists of three sections: Section A,Section B and Section C.
2. Answer all questions in Section A. Write your answers forSection A in the spaces provided in the question paper.
3. Answer one question from Section B and one question fromSection C. Answers questions in Section B and Section C indetail. You may use equations, diagrams, tables, graphs andother suitable methods to explain your answer.
4. Show your working. It may help you to get marks.
5. The diagrams in the questions are not drawn to scale unlessstated.
6. Marks allocated for each question or part question are shownin brackets.
7. You may use a non-programmable scientific calculator.
8. Hand in your answer sheets at the end of the examination.
For Examiner’s use only
Section No. Marks
1
2
A 3
4
5
6
Total
B 7
8
Total
C 9
10
Total
Total marks
This question paper consists of 16 printed pages4541/2 [Lihat sebelah
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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/ ºCW -5 67X -105 -38Y 80 140Z 801 1413
TABLE 1
(a) What is the physical state of W and Z at room temperature?
W: ....................................................................................................................
Z : ....................................................................................................................[2 marks]
(b) Draw the arrangement of particles of Y at room temperature.
[1 mark]
(c) Explain why substance X 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 Y.
[2 marks]
(e) Sketch the graph of temperature against time for substance Y when it isheated from room temperature until it reaches a temperature of 100oC.
[2 marks]
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2 Table 2 shows the proton number of a few elements in Period 3.
Element Sodium Magnesium Aluminium Chlorine Argon
Proton number 11 12 13 17 18
TABLE 2
Based on Table 2, answer the following questions :
(a) Name two metals.
………………………………………………………………………………………[1 mark]
(b) Chlorine is in group 17 in the Periodic Table. What is another name for group17elements?
……………………………………………………………………………………....[1 mark]
(c) Write the electron arrangement of aluminium atom.
………………………………………………………………………………………[1 mark]
(d) (i) Compare the atomic size of sodium and chlorine.
………………………………………………………………………………[1 mark]
(ii) Explain your answer in (d) (i).
………………………………………………………………………………
………………………………………………………………………………[2 marks]
(e) When sodium is burnt in chlorine, sodium chloride is formed.
(i) Write the chemical equation for the reaction.
………………………………………………………………………………[3 marks]
(ii) State one physical property of sodium chloride.
……………………………………………………………………………....[1 mark]
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3 Diagram 3 shows two types of cell.
(a) W
…
(b) (i
(
(
(
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5
Cell X Cell Y
DIAGRAM 3
rite the formula of all the ions present in the copper (II) sulphate solution.
………………………………………………………………………………[1 mark]
) State the observation at the cathode of cell X.
……………………………………………………………………………[1 mark]
ii) Write a half equation for the reaction that occurred in the cathode of cell X.
……………………………………………………………………………[ 1 mark]
iii) State the energy change in cell X.
…………………………………………………………………………..[1 mark]
iv) Name the product formed at the anode if copper electrodes in cell X arereplaced by carbon electrodes.
…………………………………………………………………………...[1 mark]
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(c) Based on cell Y,(i) Show the direction of electrons flow through the circuit in cell Y
in Diagram 3.[1 mark]
(ii) State the redox process that occurs at the zinc plate.
……………………………………………………………………............[1 mark]
(iii) State the change in oxidation number of zinc in this reaction.
………………………………………………………………………........[1 mark]
(iv) What happens to the voltage of the cell if the copper plate is replaced withsilver plate?
…...………………………………………………………………………[1 mark]
(d ) Write an ionic equation for the overall reaction.
. ………………………………………………………………………………[1 mark]
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4 (a) A bicycle is made up of various parts, as shown in Diagram 4.1
(i) The frame of the bicycle is made of steel. What elements does steel consist of ?
………………………………………………………………………………………….[1 mark]
(ii) Draw the arrangement of atoms in steel.
[2 marks]
(iii) Steel is strong but is not suitable to be used for the wheel rim of a racing bicycle.Why?
…………………….…………………………………………………………………….[1 mark]
Wheel rim
Frame
DIAGRAM 4
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(b) Diagram 4.2 shows parts of a car made up of manufactured substances in industry.
(i) The car seat is covered with polyvinyl chloride, PVC a synthetic polymer. Name themonomer of polyvinyl chloride.
…………………….……………………………………………………………………[1 mark]
(ii) Explain how the usage of a synthetic polymers like PVC can give rise toenviromental pollution problem.
…………………….…………………………………………………………………….
…………………….………………………………………………………………….....[2 marks]
(iii) The windscreen of the car is made of glass. There are four types of glass been used inour daily lives. Complete the table below with the types of glass and their uses.
Type of glass Uses
……………………………….
Laboratory glassware Lenses Telescope mirrors Optical fibres
……………………………….
Electrical bulb Mirrors Most kinds of glass container
………………………………. Finest tableware Art objects
Borosilicate glass
Cookware Laboratory glassware Automobile headlights Glass pipelines
[3 marks]
PVC seat cover
Glass windscreen
DIAGRAM 4.2
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5 Figure below shows the structural formulae of compounds J, K and L
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9
(a) State the homologous series for compounds J and K
Compound J : …………………………………………………………………
Compound K : …………………………………………………………………[ 2 marks ]
(b) In the figure given, circle the functional group of compound L .
[ 1 mark ]
(c) (i) Name the compound K
………………………………………………………………………………….[ 1 mark ]
(ii) Another compound, M, is in the same homologous series as K. M has fivecarbon atom. Write the molecular formula for M.
…………………………………………………………………………………[ 1 mark ]
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(d) Draw the structural formula for another isomer of compound J. Name theisomer.
[ 2 marks ]
(e) When compound K is added into a test tube containing acidified potassiumdichromate(VI) solution and heated for a few minutes, compound L is form.
(i) State one observation for this experiment
……………………………………………………………………………….[ 1 mark ]
(ii) Write a chemical equation for this reaction.
……………………………………………………………………………….[ 2 marks ]
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6 Figure 6 shows the set-up apparatus to investigate the reactions that take place in test tubesP and Q.
(a) State th
(i) in te
.....
(ii) in t
.....
(b) Write th
...........
(c) State w
..........
(d) Referin
(i) wh
....
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11
FIGURE 6
e observation for the reaction
st tube P
.................................................................................................................................[ 1 mark ]
est tube Q
.................................................................................................................................[ 1 mark ]
e ionic equation for the reaction in (a)(i)
.................................................................................................................................[ 2 marks ]
hat is meant by oxidation in terms of electron transfer.
.................................................................................................................................[ 1 mark ]
g to the reaction that takes place in test tube P,
at is the change in the oxidation number of magnesium ?
.................................................................................................................................[ 1 mark ]
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(ii) name the oxidizing agent
.....................................................................................................................................[ 1 mark ]
(e) Referring to the reaction that take place in test tube Q,
(i) state the type of reaction that bromine undergoes.
..................................................................................................................................[ 1 mark ]
(ii) what is the oxidation number of bromine in bromine water
..................................................................................................................................[ 1 mark ]
(iii) what is the function of bromine water ?
..................................................................................................................................[ 1 mark ]
(iv) name another reagent that can replace bromine water
..................................................................................................................................[ 1 mark ]
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Section B[20 marks]
Answer any one question.
7 (a) What is meant by empirical formula and molecular formula
[3 marks](b) Diagram 7.1 is the information of alkene X.
[ RelatBased on
(i)(ii)(iii)(iv)
(c) Table 7.2
Brom
Brom
ExplainWrite th
(d) Alken
(i)(ii)(iii)
A
Carbon, C 85.7 %Hydrogen, H 14.3 %
ive atomic mass: H = 1 ; C = 12 ]the information in Diagram 7.1 :
Calculate the empirical formula of alkene XDetermine the molecular formula of alkene XName the alkeneWrite the general formula for its homologous series
[8 marks]
shows the result of a test to differentiate between alkene X and alkane Y.
Procedure Observations
ine water is added to alkene X Brown colour is decolourised
ine water is added to alkane Y Brown colour remains
TABLE 7.2
why there is a difference in these observations.e chemical equations for the reactions that take place.
[5 marks]
e X can be converted to alkane Y through a reaction as shown below.
Relative molecular mass = 56
DIAGRAM 7.1
13
Name the reaction.What are the optimum conditions for theWrite the chemical equation for the reac
lkene X
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reaction occur.tion.
[4 marks]
Alkane Y
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8 (a) The table below shows the data obtained when 2.0 g of calcium carbonate granuleswere added to 20.0 cm3 of 0.1 mol dm-3 hydrochloric acid in a conical flask.
Time/s 0 60 120 180 240 300 360 420Volume of gas/cm3 0.0 5.0 9.5 13.0 16.5 18.5 19.0 19.0
(i) Based on table , draw a graph of volume of gas against time[4 marks]
(ii) From the graph, determine the average rate of reaction for the whole reaction the rate of reaction at 210 seconds
[4 marks]
(iii) Explain why potatoes fried in boiling oil cooks faster than potatoes boiled inboiling water.
[2 marks]
(iv) By using the collision theory, explain how temperature affects the rate ofreaction.
[4 marks]
(b) The table below shows three types of food additive and their functions
Type of foodadditive
Function
X To slow down or prevent the growth of microorganismsso that food can be kept for a longer period.
Y To prevent oxidation that causes rancid fats andfruits from turning brown
Z To improve and restore the taste of food
State the type of food additive X, Y and Z . State one example each.
[6 marks]
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Section C[20 marks]
Answer any one question.
9 (a) Define oxidation and reduction in terms of changes in oxidation number.[2 marks]
(b) Explain, in terms of electrons tranfer, the oxidation and reduction processes in thefollowing conversions :
(i) conversion of Fe2+ ions to Fe3+ ions
(ii) conversion of Fe3+ ions to Fe2+ ions
In your anwer, give a suitable example for each of the conversion, including thehalf equations
[8 marks](c)
Describelectron
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e an experiment to prove the above statement by using transfer ofs at a distance. In your description, you are required to includea labelled diagram which shows the set up of apparatusthe procedure of the experimentthe observations at both the electrodes
[10 marks]
Electrical energy can be produced by redox reaction.
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10. (a) A pupil carried out an experiment to investigate the chemical changes that occurto barium chloride as a result of reaction P. The result of the experiment is shown inDiagram 10
(i) The chemical equation for reaction P is as follows :
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Excess sodium sulphate is added to 50 cm3 of 0.5 mol dm-3 barium chloride.[ Given the molar mass of BaSO4 = 233 ]
Calculate the mass of barium sulphate formed.[3 marks]
(ii)Describe the experiment how to prepare the dry barium sulphate in the laboratory.
[7 marks]
(b) You are provided with barium chloride solution, sodium sulphate solution and othersuitable apparatus.Deccribe how you can determine the heat of precipitation of barium sulphate,BaSO4
in the laboratory . Your explanation should include data tabulation and calculation.
[10 marks]
END OF QUESTION PAPER
DIAGRAM 10
Barium chloride solution
Sodium sulphate solution
Sodium chloride solution
Barium sulphate precipitate
Reaction P
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SULIT4541/2 NameChemistryPaper 3 FormOctober 20091 1/2 hours
PEJABAT PELAJARAN DAERAH MELAKA TENGAH_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
CHEMISTRYPaper 3
One hour and thirty minutes
DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO
1. Tuliskan nama dan tingkatan padaruang yang disediakan.
2. Calon hendaklah membaca arahan padahalaman 2 dan 3.
Untuk kegunaan pemeriksa sahaja
SoalanMarkahPenuh
Markahdiperolehi
1 18
2 15
3 17
Jumlah 50
This question paper consists of 11 printed pages
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INFORMATION FOR CANDIDATES
1. This question paper consists of three questions. Answer all questions.
2. Write your answer for Question 1 and 2 in the spaces provided in the question paper.
3. You may use equations, diagrams, tables, graph and other suitable methods to explain youranswer.
4. Show your working, it may help you to get marks.
5. If you wish to change your answer, neatly cross out the answer that you have done. Thenwrite down the new 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 each of the questions is 30 minutes.
9. You may use a non-programmable scientific calculator.
10. Hand in your answer sheets 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 chipson the rate of reaction. A burette was filled with water and inverted over a basin ofwater. 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 closedwith a stopper fitted with a delivery tube directed to the burette and the stop-watch wasstarted simultaneously. The burette reading was recorded at 30-seconds intervals.
The above xperiment was repeated by using 5.0 g of small marble chips.
Diagrams on the next page shows the burette readings for the reaction between largemarble chips and hydrochloric acid.
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(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 min6
20
19
18
Burette reading……… cm3 at 1½ min
25
24
23
Burette reading……… cm3 at 2½ min
16
15
14
Burette reading……… cm3 at 3 min6
12
11
10
Burette reading……… cm3 at 4 min
9
8
7
Burette reading……… cm3 at 3½ min6
10
9
8
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[3 marks]
(b) Construct a table to show the time, burette readings and volumes of carbondioxide gas liberated in the experiment.
[3 marks]
(c) Table 1 shows the volume of carbon dioxide gas liberated when the experimentwas 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 ofcarbondioxide /cm3
0.00 20.00 29.00 35.00 38.00 40.00 41.50 41.50 41.50
TABLE 1
Burette reading……… cm3 at 4½ min
9
8
7
Burette reading……… cm3 at 5 min
9
8
7
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Based on the data in (b) and Table 1, draw the graphs of volume of carbondioxide gas liberated against time for both the experiments by using the sameaxes.
[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 tomeat 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 theresponding variable
.........................................................
..........................................................
(iii) Fixed variable.............................................................
.............................................................
............................................................
(iii) The way to maintain the fixedVariable
.........................................................
.........................................................
[3 marks]
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Meta
Metal L Metal M
Salt solution L1.0 mol dm-3
FIGURE 2
2. An experiment was carried out to construct an electrochemical series of metals. Figure 2shows the voltaic cell set up to measure the potential difference between metal L and M.
The experiment was repeated by replacing metal M with metal J and Q .
Dc
V
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A
CDIAGRAM 2
iagram 2.1 shows the potential difference of thrells using the pairs of metal L and M, L and J and
B
[Lihat sebelahSULIT
.1
ee voltmeters A, B and C for the voltaicL and Q respectively.
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Pair of Metals VoltmeterPotential
difference(V)Positiveterminal
L and M A L
L and J B L
L and Q C Q
TABLE 1
(a) Record the voltmeter readings for the pairs of metals in Table 1.
(b) State the hypothesis of the experiment
............................................................................................................................
.............................................................................................................................
(c) Arrange J, L, M and Q metals in the descending order in the electrochemical series
………………………………………………………………………………….
(d) Iron metal is located between metal M and metal L in the electrochemical series.State which metals are more electropositive and which are less electropositive than iron.
More electropositive than iron:...........................................................................
Less electropositive than iron :...........................................................................
(e) By using the data in Table 1, suggest the possible voltage, if M and Q metals areused as electrodes in a voltaic cell.
………………………………………………………………………………….
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3
You are given some iron nails, magnesium ribbon and copper strip .Wit reference to the above statement, plan a laboratory experiment to investigate theeffect of other metals on the rusting of iron.
Your planning should include the following aspects:
(a) Statement of problem(b) All variables(c) Statement of 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 whichitself corrodes to protect iron from rusting
SULIT 4541
4541Marking SchemeChemistry Peper 1October
1 1/4 jam
PEJABAT PELAJARAN DAERAH MELAKA TENGAH_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
MARKING SCHEME
CHEMISTRY
Paper 1
UNTUK KEGUNAAN PEMERIKSA SAHAJA
Skema Pemarkahan ini mengandungi 2 halaman bercetak.
SKEMA PERMARKAHANCHEMISTRY 1
NoSoalan Jawapan
No.Soalan Jawapan
No.Soalan Jawapan
No.Soalan Jawapan
1 C 14 A 27 B 40 D
2 D 15 A 28 D 41 A
3 C 16 D 29 C 42 B
4 A 17 D 30 D 43 A
5 B 18 B 31 C 44 D
6 C 19 D 32 B 45 B
7 A 20 C 33 A 46 D
8 C 21 D 34 D 47 D
9 B 22 B 35 C 48 B
10 B 23 C 36 B 49 C
11 C 24 A 37 C 50 C
12 B 25 B 38 D
13 C 26 A 39 C
1
4541/1Chemistry 2Skema PemarkahanOctober 20091 1/4 hours
PEJABAT PELAJARAN DAERAH MELAKA TENGAH_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
CHEMISTRY
Paper 2
MARKING SCHEME
UNTUK KEGUNAAN PEMERIKSA SAHAJA
This marking scheme consists of 9 printed pages.
2
SECTION A
No. Rubric Mark
1 (a)
(b)
(c)
(d)
(e)
P: liquidS: solid
1. Particles of Q held together by weak intermolecular forces2. A small amount of heat energy is required to overcome
Diagram1. label2. functional apparatus
1. label of axis2. shape of graph
11
1
11
11
11…9
Time ( min)
Temperature / oC
3
2 (a) Sodium and magnesium // sodium and aluminium //magnesium and aluminium 1
(b) Halogen 1
(c) 2.8.3 1
(d) (i) Sodium, magnesium, aluminium, chlorine, argon 1
(ii) The proton number // the positive charge increasesfrom sodium to argon
The attraction by the nucleus on the electronsin the first three occupied shells become stronger
1
1…2
(e) (i) Sodium burnt rapidly and brightly with a yellow flame //White fumes liberated // white solid formed 1
(ii) 2Na + Cl2 → 2NaCl[Formula of reactants and product are correct][Balanced equation]
11… 2
(iii) has high melting / boiling point // conduct electricityin the molten state or aqueous solution // soluble in water 1
10
3 (a)
(b) (i)(ii)
(iii)(iv)
(c) (i)(ii)
(iii)(iv)
(d)
H+ , Cu2+ , SO42- , OH-
Copper electode becomes thicker//brown solid is depositedCu2+ + 2e CuElectrical energy to chemical energyOxygen
(from zinc plate to copper plate)Oxidation0 to +2Increases
Zn + Cu2+ Cu + Zn2+
1
1111
1111
1...10
4
4 (a) (i) Iron and carbon1
(ii)
[ Suitable diagram ] 1[ Label iron & carbon atom] 1……….. 2
(iii) heavy 1
(b) (i) Chloroethene // Vinylchloride 1
(ii) Not easily biodegradable 1Cause blockage of drainage systems / flash floods 1
ORGive out harmfull / poisonous / toxic gases 1Cause air pollution 1 ………….2
(iii)
Type of glass Uses
…Fused glass…
…Soda-lime glass…
…Lead crystal glass...
3
10
Iron atom
Carbon
5 (a) 1. J : Alkene2. K : Alcohol
11
(b)
(c) (i)
(ii)
B
C
(d)
(e) (i)
(ii)
Ob
C
6 (a)(i)
(ii)
(b)
(c)
(d)(i)(ii)
(e)(i)(ii)
(iii)
(iv)
1utanol
5H11OH
1
1
5
1 + 1
range solution turn to green // Smell of vinegar // The product changelue litmus paper to red
H3CH2CH2CH2OH + 2[O] → CH3CH2CH2COOH + H2O
1
1+1
10
Blue solution turns colourless//intensity of blue colour reduce // Brownsolid substance form // brown solid form // brown deposite 1Green solution turns yellow/brown
Mg + Cu2+ → Mg2+ + Cu 2
Substance/particles loss/donate an electrons 1
0 to +2 1Copper(II) sulphate // Copper(II) ion 1
Redoxs 10 // zero 1
Oxidizing agent // oxisidise ferum(II) sulphate/ferum(II) ion 1
Chlorine water// asidified potassium manganate(VII) solution // asidifiedpotassium dichromate(VI) solution
1
10
6
SECTION B
7 (a) Empirical formula1. Formula that shows the simplest ratio2. of atom of each element in compoundMolecular formula1. Formula that shows actual number2. of atom of each element in compound
2
1 .............3(b) (i)
Element C H
Number ofmoles (mol) 12
7.85= 7.14
1
3.14= 14.30
Ratio of moles14.7
14.7= 1
14.7
30.14≈ 2
Empirical formula for alkene X is CH2
1
1
1
(ii) n [ 12 + 2(1)] = 56
14 n = 56n = 4
Molecular formula for the alkene X is :
4 (CH2) C4H8
11
1
(iii) Butene 1
(iv) CnH2n1………..8
(c) 1. Alkane undergoes an addition reaction2. Bromine is added to a double bond3. Unsaturated compound changes to saturated compound //
Double bond changes to single bond4. No more bromine molecules // colourless product is
formed // dibromobutane is formed.5. C4H8 + Br2 → C4H8Br2
11
1
11………5
(d) (i) Hydrogenation 1
(ii) Optimum condition :Temperature : 180 oCCatalyst : Platinum // Nickel
11
(iii) C4H8 + H2 → C4H10 1………4
20
7
8 (a) (i) 1. Both axis are labelled and with unity axis ; volume/cm3 and x axis ; time/s
2. Uniform scale (size of graph must be bigger)3. All points are transfered correctly4. Best fit curve
1
111
(ii) 1. Average rate of reaction = 19.0/1202. = 0.0528 cm3s-1
3. Construct tangen at 210 s4. 0.052 cm3s-1 0.050 ≤ k ≤ 0.054
1111
(iii)
(iv)
1. Boiling point of oil is higher than boiling point of water2. At higher temperature potatoes is faster to cook
1. The higher the temperature, rate of reaction increase2. High temperature, kinetic energy of particles increase//particles
moves faster3. Collision frequency between particles increase4. Effective collision frequency increase
11
1
111
(b)
Type of food additive Example1. X = Preservatives 4. Salt/Sugar/Vinegar/Sodium
nitrite/Sodium nitrate/Benzoicacid/Sodium benzoate
2. Y = Antioxidants 5. Ascorbic acid/Sodium citrate/3. Z = Flavourings 6. Monosodium glutamate/
aspartame/sugar/salt/vinegar/[ester]
1+1
1+1
1+1
20
8
SECTION C
9 (a) 1. Oxidation - increase in oxidation number2. Reduction – decrease in oxidation number
11…2
(b)(i) 1. Fe+2 Fe+3 + e2. Br2 + 2e 2Br –
3. Iron(II) ions lose electrons to become iron(III) ions. Iron(II) ionsare 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 + 2e3. Iron(III) ions gain electrons to become iron(II) ions. Iron(III)
ions are reduced4. Zinc atoms lose electrons to form zinc ions. Zinc atoms are
oxidised(a: any suitable reducing agent)
111
1
111
1…8
(c) Diagram:1. label2. functional apparatus
Procedure:1. Pour dilute sulphuric acid into a U-tube2. Using a dropper, add iron(II) sulphate solution at one side3. and acidified potassium manganate(VII) solution at another side4. Place carbon electrode in each side of the U-tube5. Connect the electrodes to a galvanometer by using connecting
wires//Complete the external circuit6. Record any change that can be observed after a few minutes
Observations:The green colour of iron(II) solution turns to brownThe purple colour of acidified potassium manganate(VII) solution isdecolourised/change to colourless
(a: any suitable cell)
11
11111
1
11…10
20
9
10 (a) (i) Number of mole BaCl2 = 0.025 molFrom the equation,
1 mol of BaCl2 produces 1 mol BaSO4 //0.025 mol of BaCl2 produces 0.025 mol BaSO4
Mass = 0.025 x 233= 5.825 g
1
1
1………3
(ii) [ Suggested answer ]
1. Measure 50 cm3 of barium chloride 0.5 mol dm -3 in a measuringcylinder.
2. Pour the solution into the beaker.3. Measure 50 cm3 of sodium suphate 0.5 mol dm -3 in a measuring
cylinder.4. Pour the solution into the beaker containing barium chloride
solution.5. Stir the mixture with glass rod and rinse with distilled water.6. Filter the precipitate.7. Dry the salt using 2 pieces of filter paper.
1
11
1
111…… ...7
(b) [Procedure]1. Measure 50 cm3 of barium chloride 0.5 mol dm -3 in a measuring
cylinder.2. Pour the solution into the plastic cup/beaker.3. Record the initial temperature1. Measure 50 cm3 of sodium sulphate 0.5 mol dm -3 in a measuring
cylinder.2. Pour the solution into the plastic cup/beaker.3. Record the initial temperature4. Add the barium chloride solution into the sodium sulphate5. Stir the mixture with thermometer6. Record the highest/maximum temperature
7. [Data]
Initial temperature of BaCl2 solution = T1 oCInitial temperature of Na2SO4 solution = T2 oCHighest temperature = T3 oC
[Calculation]8. Average initial temperature = (T1 + T2)/2 = T4
oC9. Temperature change = T3 – T4
10. Heat change = (50+50) x 4.2 x (T3 – T4) J = Q J11. No. of mole BaSO4 = No of mole BaCl2 = No of mole Na2SO4
= (0.5 x 50)/1000 = n mol12. Heat of Precipitation of BaSO4
ΔH = - Q / 1000n kJ mol-1 Max 10
20
1
4541/1Chemistry 3Skema PemarkahanOctober 20091 1/4 hours
PEJABAT PELAJARAN DAERAH MELAKA TENGAH_______________________________________________________
PROGRAM LONJAKAN SAUJANA SPM 2009
CHEMISTRY
Paper 3
MARKING SCHEME
UNTUK KEGUNAAN PEMERIKSA SAHAJA
This marking scheme consists of 9 printed pages.
2
PAPER 3
1 ( a )
Score Rubric3 [ Able to state all the 11 volume or burette readings correctly ]
2 decimal places Unit cm3
Suggested answer0.00, 9.50, 18.10, 25.50, 30.10, 34.50, 38.10, 40.00, 41.50, 41.50, 41.50 or
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)
Sco
re
Rubric
3 [Able to design a table and record the time, buret reading and volume of gas liberated]
1. Time /minute2. 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
Buretreading/cm3
49.60 40.10 31.50 24.10 19.50 15.10 11.50 9.60 8.10 8.10 8.10
Volumeof 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 ofgas liberated] // [Able to design table without unit]
1[Able to give idea on table ]Suggest answer: 2 rows x 11 columns
3
1 (c)
Score Rubric3 [ 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 againsttime 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 againsttime with at least 4 items abovebelow correctly]
1 [ Able to manipulate two items correctly ]0 No response or wrong response
1 ( d )
Score Rubric3 [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 largepieces of marble chips of the same mass, course the time taken for reactionmore 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 forreaction 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 forreaction more faster when size of reactant smaller // rate of reaction depend onthe size of reactant
0 No response or wrong response
4
1 (e)
Score Rubric3 [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
increases2 [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
1 (f)
Score Rubric3 [ 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 chipsResponding variable :Rate of reaction // time Measure the volume of gas collected
at half-minute intervalFixed variable :Mass of marble, volume ofhydrochloric acid, temperature
Use the same mass/5.0 g marble,same volume/50 cm3 andconcentration/ 0.1 mol dm-3
hydrochloric acid, same tepperaturein 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 variablescorrectly // any two action correctly]
0 No response or wrong response
5
QuestionNumber
Rubric Score
2(a)
[Able to write potential difference with two decimal correctly]Example
Pair of metals Potentialdifference(V)
Positive terminal
L and M 1.00 LL and J 1.60 LL and Q 0.40 Q
3
[Able to write potential difference almost correct]Example
Pair of metals Potentialdifference(V)
Positive terminal
L and M 1.0 LL and J 1.6 LL and Q 0.4 Q
2
[Able to write potential difference incomplete or in range]Example
Pair of metals Potentialdifference(V)
Positive terminal
L and M 1.0 - 1.5 LL and J 1.5 - 2.0 LL and Q 0 - 0.5 Q
1
[ No response or wrong response] 0
QuestionNumber
Rubric Score
2(b)
[Able to give the hypothesis accurately]Example:The further the distance between two metals in the electrochemicalseries, the higher the potential difference / voltage
3
[Able to give the hypothesis almost accurately]Example:The further the distance between two metals, the higher potentialdifference/voltage // vice versa
2
[Able to state an idea of hypothesis]Example:The distance between two metals the higher affects the potentialdifference
1
[ No response or wrong response] 0
6
QuestionNumber
Rubric Score
2(c)
[Able to arrange the metals in the electrochemical series indescending order correctly]Answer: :J, M, L, Q
3
[Able to arrange the metals almost correctly]Example:J,M, Q
2
[Able to state an idea to arrange the metals]Example:J metal is higher position compared to the other metals(M/L/Q)
1
[ No response or wrong response] 0
QuestionNumber
Rubric Score
2(d)
[Able to classify the metals correctly]Answer: :More electropositive : J, MLess electropositive : L, Q
3
[Able to classify the metals almost correctly]Example:More electropositive : J, MLess electropositive : L/QorMore electropositive : J/ MLess electropositive : L, Q
2
[Able to state an idea to arrange the metals]Example:1. More electropositive : L/ Q
Less electropositive : J/ M
2. More electropositive : L, QLess electropositive : J, M
1
[ No response or wrong response] 0
QuestionNumber
Rubric Score
2(e)
[Able to predict correctly]Answer: 1.40V 3
[Able to predict almost correctly]Example:
1.402
[Able to state an idea to arrange the metals]Example:Reading is higher than 1.0 / lower than 1.6
1
[ No response or wrong response] 0
7
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]
3 (b) - variables
Score Rubric
3
[ Able to state All variables correctly ]
Suggested answer :Manipulated variable : Different types of metals// Different metalsResponding variable : Rate of rusting // Rusting of ironConstant 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]
8
3 (c) - hypothesis
Score Rubric3 [Able to give the hypothesis accurately]
Suggested answer :When a more electropositive metal is in contact with iron, the metal inhabitsrusting // When a less electropositive metal is in contact with iron, the metalspeed up rusting // Iron rusts faster when in contact with metal lesselectropositive
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 inhabitsrusting
0 No response or wrong response
3 (d) - Apparatus and materials
Score Rubric
3
[ Able to give the list of the apparatus and substances correctly andcompletely]
Suggested answer :Apparatus : Three test tubes, test tube rackMaterials : sand paper, three iron nails, magnesium strip, copper strip, hotagar/jelly solution mixed with potassium hexacyanoferrate(III) solution andphenolphthalein indicator
2
[ Able to give the list of the apparatus and substances correctly and but notcompletely]
Example :List of apparatus and materialsTest tube, iron nail, magnesium, copper,water, potassiumhexacyanoferrate(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]
9
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 paper2. Coil the metal strip around the iron nails and then put in the each test tube3. Pour the same volume of hot agar-agar/jelly solution has been mixed with
potassium hexacyanoferrate(III) and phenolphthalein indicator4. Leave the test tubes aside for one day5. 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
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 3 columns and 3 rowsExample :
Test tube A B CIntensity ofblue colourIntensity ofpink colour
2
[ Able to exhibit the tabulation of data less accurately ]
Tabulation of data has 6 columns and 2 rowsExample :
Test tube A B CObservation
1[ Able to state an idea about the tabulation of data ]Tabulation of data has 2 columns and 1 rows or 1 colums and 1 rows
0 [No response or wrong response]
Total 3 × 6 = 18Max 17