Transcript
MOZ@C SULIT 4541/1 KIMIA Kertas 1 Oktober 2008 1¼ hrs
4541/1
BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA ______________________________________________ PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008
KIMIA
Kertas Kertas 1 Satu jam lima belas minit
JANGAN BUKA KERTAS SOALAN INI HINGGA DIBERITAHU 1. 2. 3. 4. 5. 6. 7.
Kertass soalan Kerta soalan ini meng mengan andun dungi gi 50 soala soalan. n. Jawab semua soa soalan lan Jawab Jawab dengan dengan menghit menghitamka amkan n ruangan ruangan yang yang betul betul pada kertas kertas jawapan jawapan Bagi Bagi setia setiap p soalan soalan hitam hitamka kan n satu satu ruang ruangan an sahaja sahaja Sekiran Sekiranya ya anda anda hendak hendak menuka menukarr jawapan, jawapan, padamka padamkan n tanda tanda yang yang telah telah dibuat. dibuat. Kemudian hitamkan jawapan yang baru. Rajah Rajah yang yang mengiri mengiringi ngi soalan soalan tidak tidak dilukisk dilukiskan an mengiku mengikutt skala. skala. Anda Anda dibenark dibenarkan an menggun menggunakan akan kalkulat kalkulator or saintifik saintifik yang tidak tidak boleh boleh diprogramkan.
Kertas soalan soalan ini mengandungi mengandungi 20 halaman bercetak bercetak
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SMS MUZAFFAR1SYAH , MELAKA
MOZ@C
SULIT
MOZ@C 1
2
3
4
Which of the following substances contain molecules?
A
Zinc
B
Ethanol
C
Sodium chloride
D
Magnesium Magnesium oxide
Which of the following is the correct formula for barium hydroxide? A
BaOH
B
Ba2OH
C
Ba(OH)2
D
BaOH2
Which of the following set of elements consist of all non metals?
A
Chlorine, Nitrogen and Sulphur
B
Oxygen, Hydrogen and Lithium
C
Phosphorus, Lead and Carbon
D
Carbon, Iodine and calcium
Which of the following compounds have electrostatic forces between the particles?
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A
Ammonia
B
Naphthalene
C
Iodine
D
Potassium oxide
SMS MUZAFFAR2SYAH , MELAKA
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MOZ@C 1
2
3
4
Which of the following substances contain molecules?
A
Zinc
B
Ethanol
C
Sodium chloride
D
Magnesium Magnesium oxide
Which of the following is the correct formula for barium hydroxide? A
BaOH
B
Ba2OH
C
Ba(OH)2
D
BaOH2
Which of the following set of elements consist of all non metals?
A
Chlorine, Nitrogen and Sulphur
B
Oxygen, Hydrogen and Lithium
C
Phosphorus, Lead and Carbon
D
Carbon, Iodine and calcium
Which of the following compounds have electrostatic forces between the particles?
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A
Ammonia
B
Naphthalene
C
Iodine
D
Potassium oxide
SMS MUZAFFAR2SYAH , MELAKA
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MOZ@C 5
6
7
Which of the following is the energy change that occurs in the process of electrolysis?
A
electrical electrical energy
heat energy
B
potential potential energy
chemical energy
C
electrical electrical energy
chemical energy
D
chemic chemical al energy energy electrical energy
The properties of acids are due to the presence of
A
hydrogen hydrogen ion
B
hydroxide hydroxide ions
C
hydrogen atoms
D
hydrogen molecules
Which of the following statements is correct?
A
All carbonate salts are soluble in water
B
All chloride salts are soluble in water
C
All nitrate salts are soluble in water
D
All sulphate salts are soluble in water
8
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The National Monument is made of bronze. Which is the main metal in bronze?
A
Aluminium
B
Iron
C
Tin
D
Copper
SMS MUZAFFAR3SYAH , MELAKA
MOZ@C
SULIT
MOZ@C An enclosed cylinder is filled with helium atoms. Which diagram shows the arrangement
9
of the helium atoms ?
10
The formula of a substance is written as FeSO 4. What is the name of the compound according to the IUPAC system?
A
Iron sulphate
B
Iron(II) sulphate
C
Iron(III) sulphate
D
Iron(II) sulphite
11 The element which does not form compound with other elements is likely to have proton
number of
A
4
B
8
C
10
D
16
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SMS MUZAFFAR4SYAH , MELAKA
MOZ@C
SULIT
MOZ@C 12
Which of the following represents the electron arrangement for sodium chloride, NaCl? [Proton number; Na, 11; Cl, 17]
13
Electrolytes are able to conduct electricity because they
14
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A
have low melting point and boiling point
B
contain freely moving ions
C
contain freely moving electron
D
contain freely moving molecules
Which of the following statement describes the property of hydrochloric acid?
A
It reacts with any metal to give hydrogen
B
It liberates ammonia from ammonium salts
C
It causes colour of litmus paper to change from red to blue
D
It reacts with any bases to produce a salt.
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MOZ@C 15
16
Insoluble salts can be prepared through
A
Precipitation Reaction
B
Neutralization Reaction
C
Crystallization
D
Recrystallization
Haber Process can be represented by the following equation: N2 (g)
+ H2 (g) → 2NH3 (g)
What is the catalyst, temperature and pressure used in this process? Catalyst
17
18
Temperature( C)
Pressure (atm)
˚
A
Iron
450
200
B
Platinum
900
150
C
Platinum
800
10
D
Iron
200
1050
The atoms
31
P and
15
32
S have the same
16
A
number of protons
B
number of neutrons
C
number of electrons
D
nucleon number
The ion of a newly discovered metal M has the symbol M
3+
. What will be the formula of
its chloride? A
MCl
B
M2Cl3
C
MCl3
D
M3Cl
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SMS MUZAFFAR6SYAH , MELAKA
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19
The property of an element which cannot be predicted from the position of an element in the Periodic Table of Elements is
A
the charge of its ion.
B
the formula of its oxide
C
the number of isotopes it has.
D
the acidic or basic nature of its oxide.
20
Table 1 shows the proton number of elements M and N. Element
Proton number
M
3
N
17 TABLE 1
Which of the following is true of the compound formed between elements M and N?
21
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Compound formula
Type of bond
A
MN
Ionic bond
B
MN
Covalent bond
C
M2N3
Ionic bond
D
M3N2
Covalent bond
Which of the following voltaic cells produces the highest voltage? A
Iron - copper cell
B
Zinc - copper cell
C
Aluminium - zinc cell
D
Magnesium - copper cell
SMS MUZAFFAR7SYAH , MELAKA
MOZ@C
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MOZ@C 22
Zn(s) +
H2SO4(aq)
→
ZnSO4(aq)
+
H2(g)
Based on the equation above we can conclude that [Relative atomic mass: Zn, 65; H,1; O,16; S, 32]
I
1 mol of sulphuric acid will produce 1 mol of zinc sulphate
II
1 mol of zinc will react with 1 mol of sulphuric acid
III
100 cm sulphuric acid 1 mol dm will produce 16.1 g zinc sulphate if the zinc
3
-3
used is in excess. IV
The total volume of hydrogen gas liberated will be determined by the amount of zinc and sulphuric acid reacted.
23
A
II and IV only
B
I, II and III only
C
I, III and IV only
D
I, II, III and IV
Which of the following ions would liberate a gas that turns damp red litmus paper blue when added with sodium hydroxide solution and then heated?
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+
A
H
B
NH4
C
Zn
D
Fe
+
2+
2+
SMS MUZAFFAR8SYAH , MELAKA
MOZ@C
SULIT
MOZ@C 24
Table 2 shows the pairs of polymer and monomer. Polymer
Monomer
I
Carbohydrate
Glucose
II
Polyvinyl chloride
Chloroethene
III
Protein
Amino acid
IV
Natural rubber
Neoprene
TABLE 2 Which of the following pairs of polymer and monomer are correct ?
A
I and II only
B
I, II and III only
C
II, III and IV only
D
I, II, III and IV
25
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Which of the following diagram represents magnesium oxide?
SMS MUZAFFAR9SYAH , MELAKA
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MOZ@C 26
How many molecules of bromine are there in 0.045 mol of bromine? [Avogadro Constant ; 6.02 X 10
27
A
2.7 X 10
22
B
3.3 X 10
23
C
7.9 X 10
24
D
1.2 X 10
25
23
]
An element X requires two electrons to form a stable negative ion. Which group is X located in the Periodic Table of Elements?
28
A
2
B
16
C
17
D
18
The electron arrangement of atoms P and Q are 2.8.4 and 2.6 respectively. Which of the following statement is true about the formation of a compound between P and Q ?
A
Each atom Q receives an electron from one atom P
B
Each atom P receives four electrons from one atom Q
C
Each atom P combines with two atoms Q by sharing of electrons
D
Each atom P combines with one atom Q by transfer of electrons
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10SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 29
-3
Silver nitrate solution of 1 mol dm is electrolysed by using silver electrodes. Which of the following half equations occur at the anode and cathode respectively?
Anode
30
31
Cathode
-
O2 + 2H 2O+ 4e
2H + 2e
4OH
-
O2 + 2H 2O+ 4e
Ag + e
+
Ag
C
Ag
Ag + e
+
Ag
D
Ag
Ag + e
A
4OH
B
+
+
Ag + e
+
2H + 2e
+
H2
H2
Sulphuric acid is a diprotic acid because
A
sulphuric acid has the properties of acid and also a dehydrating agent.
B
one mole of sulphuric acid can neutralise two moles of bases.
C
one molecule of sulphuric acid contains two moles OH ions.
D
one molecule of sulphuric acid produces two H ions in water.
-
+
The following equation represents the reaction between copper(II) oxide and nitric acid. CuO
+
2HNO3
→
Cu(NO3)2
+
H2O
Calculate the mass of copper(II) nitrate formed when 6.4g of copper (II) oxide powder reacts with excess nitric acid. [ Relative atomic mass: Cu,64; N,14; O,16]
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A
4.96g
B
5.04g
C
7.52g
D
15.04g
11SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 32
Diagram 1 below shows the atom arrangement in brass that is represented by atom P and atom
Q.
Atom P
Atom Q
DIAGRAM 1 Which of the following represents metals P and Q?
33
P
Q
A
Copper
Zinc
B
Tin
Copper
C
Zinc
Carbon
D
Zinc
Copper
An element represented by the symbol
7 3
X
A
has three valence electrons
B
forms a positively charged ion.
C
is located in Group 17 of the Periodic Table.
D
has 3 protons and 7 neutrons.
34
8 atoms of element Z have the same mass as in 1 atom of tellurium, Te.
Based on the statement above, what is the relative atomic mass of element Z? [Relative atomic mass : Te, 128 ]
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A
8
B
16
C
32
D
64
12SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 35. Which of the following locations are correct of an element with a proton number of 7 in
the Periodic Table of Elements?
I
Period 2
II
Period 5
III Group 15 IV Group 2
A
I and III only
B
II and IV only
C
I and IV only
D
II and III only
36
Diagram 2 shows the electron arrangement in a molecule formed between two Z atoms.
Z
Z
DIAGRAM 2 Which of the following statements is true about molecule Z 2?
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A
Exists as solid at room temperature.
B
Conducts electricity in molten state.
C
Has a low melting point.
D
Dissolves in water.
13SYAH , MELAKA SMS MUZAFFAR
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SULIT
MOZ@C 37
Substance X in the molten form is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited at the cathode and a greenish yellow gas is released at the anode. What is substance X?
38
A
Lead (II) chloride
B
Lead (II) bromide
C
Copper (II) bromide
D
Copper (II) chloride
Which of the following solutions has the lowest pH value? -3
A
0.1 mol dm sulphuric acid, H 2SO4
B
0.1 mol dm ethanoic acid, CH 3COOH
C
1.0 mol dm aqueous ammonia, NH 4OH
D
1.0 mol dm sodium hydroxide solution, NaOH
-3 -3 -3
39
Zn
2HCl →
+
ZnCl2
+
H2
Based on the equation above, calculate the volume of hydrogen gas released at room conditions when 1.3 g of zinc powder reacts with excess hydrochloric acid. 3
-1
[ Molar volume : 24 dm mol at room conditions, Relative atomic mass: H,1; Cl, 35.5; Zn, 65]
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3
A
120 cm
B
240 cm
C
360 cm
3
D
480 cm
3
3
14SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 40
The manufacturing of sulphuric acid involves several reactions. Which of the following equations represents the reaction that requires the use of vanadium(V)oxide as catalyst?
41
A
S + O2 → SO2
B
2SO2 + O2 → 2SO3
C
SO3 + H2SO4 → H2S2O7
D
H2S2O7 + H2O → 2H2SO4
Which of the following graphs shows the temperature (T) against time (t) when a mixture o
o
of pentane (boiling point 36 C) and hexane (boiling point 70 C) is distilled?
42
-1
A hydrocarbon has the empirical formula of CH 3 with a molar mass of 30 g mol . Which of the following is the molecular formula of the hydrocarbon? [Relative atomic mass : H, 1; C,12 ]
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A
CH3
B
C2H6
C
C3H9
D
C4H12
15SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 43
Element X reacts with cold water to form alkaline solution while element Y reacts with water to form acidic solution. Which of the following is the correct group of X and Y in the Periodic Table of Elements?
X
Y
A
1
14
B
2
15
C
1
17
D
3
17
44
Table 3 shows the proton number of three elements X, Y and Z. Element
X
Y
Z
Proton Number
12
8
17
TABLE 3 What is the formula of the substance and the type of bond formed between X, Y and Z?
Formula
Type of Bond
I
XY
Covalent
II
YZ2
Covalent
III
XZ2
Ionic
IV
Z2
Covalent
A
IV only
B
III and IV only
C
II, III and IV only
D
I, II, III and IV
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16SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 45
Diagram 3 shows the set up of the apparatus of a simple voltaic cell. The reading on the voltmeter is 0.3 V.
Zinc plate
Iron plate
Iron (II) sulphate solution DIAGRAM 3
Which of the following statements will increase the reading of the voltmeter?
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I
Increase the volume of iron (II) sulphate solution
II
Substitute the iron plate with a silver plate
III
Use a more dilute iron (II) sulphate solution
IV
Substitute the zinc plate with a magnesium plate
A
I and II only
B
I and III only
C
II and IV only
D
II, III and IV only
17SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 46
Neutralization reaction between nitric acid and calcium hydroxide is shown in the chemical equation below. 2HNO3
+
Ca(OH)2
→ Ca(NO3)2
+
2H2O -3
What is the minimum volume of nitric acid of 0.2 mol dm needed to completely 3
-3
neutralise 50 cm calcium hydroxide solution 0.05 mol dm .
47
A
12.5 cm
3
B
25.0 cm
3
C
37.5 cm
3
D
50.0 cm
3
When sodium hydroxide is added dropwise until in excess to a solution, a white precipitate which is soluble in excess is formed. The ions that could be present in the solution are 3+
I
Al
II
Zn
2+ 2+
III Mg
2+
IV Pb
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A
I and II only
B
III and IV only
C
I, II, and IV only
D
I, II, III and IV
18SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 48
Which of the following properties of ceramics are correctly matched to the ceramic articles?
Ceramic articles
Properties of ceramic
I
Tiles
Resistant to chemical reactions
II
Spark plug
High melting point
III
Superconductor
Low electrical resistance
IV
Electrical cable holder
A
I and II only
B
II and III only
C
I, II and III only
D
II, III and IV only
Good conductor of electricity
49 Elements P, Q and R are in the same group in the Periodic Table of Elements. Table 4
shows the observation for the reaction of the elements with chlorine and the formula of the chloride formed.
Reaction with chlorine
Formula of chloride
P
Burns brightly
PCl
Q
Burns very brightly
QCl
R
Burns most brightly
RCl
TABLE 4
Which of the following statements is correct?
A P, Q, R are earth metals B The atomic radius increases from P to Q to R C The elements form ion with univalent negative charge D Their reactivity decreases down the group
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19SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C 50
Diagram 4 below shows the set up of the apparatus for the electrolysis of concentrated sodium chloride solution.
DIAGRAM 4
Which of the following formulas shows the products formed at the anode and the cathode respectively?
Anode
Cathode
A
O2
H2
B
Cl2
H2
C
Cl2
Na
D
O2
Cl2
END OF QUESTION PAPER
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20SYAH , MELAKA SMS MUZAFFAR
MOZ@C
SULIT
MOZ@C Nama: ........................................ ............ Tingkatan: .............................. SULIT 4541/2 Kimia Kertas 2 Oktober 2008 2 ½ jam BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH / KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008 KIMIA
Kertas 2 Dua jam tiga puluh minit JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU
1. 2.
3.
4.
5.
6.
Tuliskan nama dan tingkatan pada ruang yang disediakan. Jawab semua soalan daripada Bahagian A. Tuliskan jawapan anda dalam ruang yang disediakan Jawab satu soalan daripada Bahagian B dan satu soalan daripada Bahagian C .Jawapan kepada bahagian B dan Bahagian C hendaklah ditulis pada kertas tulis. 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. Anda hendaklah menyerahkan kertas tulis dan kertas tambahan, jika digunakan bersama-sama dengan kertas soalan. Penggunaan kalkulator saintifik yang tidak boleh diprogramkan adalah dibenarkan.
Bahagian
A
B
C
Soalan
1 2 3 4 5 6 7 8 9 10
Markah penuh
Markah diperoleh
10 10 10 10 10 10 20 20 20 20 Jumlah
Kertas soalan ini mengandungi 16 halaman bercetak [lihat sebelah SULIT
SMS MUZAFFAR SYAH , MELAKA
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MOZ@C
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SULIT 1.
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MOZ@C Diagram 1.1 shows the symbols for atoms of elements X, Y and Z.
24
28
X 12
19
Y
Z
14
9
DIAGRAM 1.1
(a) (i) Write the electron arrangement of atom Z. ……………………………………………………………………………………………… [1 mark] (ii) What is the number of neutrons for atom Y? ……………………………………………………………………………………………… [1 mark] (iii) What is the atomic mass of atom X? ……………………………………………………………………………………………… [1 mark]
(b) Diagram 1.2 shows the set up of the apparatus of an experiment where a drop of bromine liquid is dropped into a gas jar and is left for a few minutes.
bromine gas
DIAGRAM 1.2
State one observation in the gas jar after a few minutes.
(i)
……………………………………………………………………………………………………. [1 mark] (ii)
Name the process that occurred in the gas jar. ………………………………………………………………………………………………….. [1mark]
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2 SMS MUZAFFAR SYAH , MELAKA
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MOZ@C
[Lihat sebelah] SULIT
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SULIT (iii)
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MOZ@C Name the type of particles that exist in bromine.
………………………………………………………………………………………………….. [1 mark] (iv)
State the change of state of bromine that occurred in the gas jar. ………………………………………………………………………………………………….. [1 mark]
(v)
The change of state in (b) (iv) can occur at room temperature. Explain why …………………………………………………………………………………………………. [1 mark] o
(c) Substance X has a melting point of 79 C . Draw the particles arrangement of substance X at 60oC and at 80 oC.
At 60oC
At 80oC [2 marks]
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3 SMS MUZAFFAR SYAH , MELAKA
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MOZ@C
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2. An experiment was carried out in the school laboratory to determine the empirical formula of an oxide of copper by flowing hydrogen gas over heated copper oxide. Table 2 shows the results obtained.
Description
Mass (g)
Combustion tube + asbestos paper
36.20
Combustion tube + asbestos paper + copper oxide
39.40
Combustion tube + asbestos paper + copper
38.76
TABLE 2 (a)
What is meant by ‘empirical formula’ ? ……………………………………………………………………………………………… ……………………………………………………………………………………………… [1 mark]
(b)
Draw a labelled diagram to show the set up of the apparatus that can be used to carry out the experiment above.
[2 marks]
(c)
State one precautionary step to be taken when carrying out the experiment above. ……………………………………………………………………………………............... [1 mark]
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4 SMS MUZAFFAR SYAH , MELAKA
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MOZ@C (d)
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Based on the results obtained, (i)
calculate the mass of copper and oxygen that have reacted.
[1 mark] (ii)
determine the ratio of moles of copper atom to oxygen atom. [Relative atomic mass: Cu, 64; O, 16]
[1 mark] (iii)
determine the empirical formula of the copper oxide
[1 mark]
(e)
Write a balanced chemical equation for the reaction between copper oxide and hydrogen. ……………………………………………………………………………………………… [1 mark]
(f)
Can the empirical formula of magnesium oxide be determined through the experiment above? Give one reason for your answer. ……………………………………………………………………………………………… ……………………………………………………………………………………………… [2 marks]
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5 SMS MUZAFFAR SYAH , MELAKA
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SULIT 3.
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MOZ@C
Diagram 3 shows the position of several elements in the Periodic Table of Elements. The letters do not represent the actual symbols of the elements.
P
U
Q
V
T
R
S
W
DIAGRAM 3
(a)
Using the letters in Diagram 3, answer the following questions. (i)
Choose an element that is monoatomic. …………………………………………………………………………………… [1 mark]
(ii)
Which element forms an amphoteric oxide?
(iii)
…………………………………………………………………………………… [1 mark] Which element is a halogen? …………………………………………………………………………………….. [1 mark]
(b)
Write the formula for the ion formed from an atom of element P. ……………………………………………………………………………………………… [1 mark]
(c)
Which element has the biggest atomic radius? ……………………………………………………………………………………………… [1 mark]
(d)
(i)
Why are elements Q and R placed in the same group?
……………………………………………………………………………………………… [1 mark]
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6 SMS MUZAFFAR SYAH , MELAKA
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SULIT
MOZ@C (ii)
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When a small piece of element Q is put into water, a type of solution is formed. Name the type of solution formed.
……………………………………………………………………………………………… [1 mark] (iii)
Compare the reactivity of the reaction towards water between elements Q and R.
……….…………………………………………………………………………………….. [1 mark] (e)
Arrange P, U, V and T according to the increase in size of atoms. ……………………………………………………………………………………………… [1 mark]
(f)
State one special characteristic of element S. ……………………………………………………………………………………………… [1 mark]
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7 SMS MUZAFFAR SYAH , MELAKA
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MOZ@C
4. Diagram 4 shows the set up of the apparatus for the electrolysis of copper(II) sulphate solution using copper as electrodes.
T
U
copper(II) sulphate solution DIAGRAM 4
(a)
State which electrode acts as the anode. ……………………………………………………………………………………................ [1 mark]
(b)
Name all the ions present in the solution. ………………………………………………………………………………………............ [1 mark]
(c)
(i)
State the observation at electrode T .
………..……………………………………………………………………………….......... [1 mark] (ii) Write the half equation for the reaction at electrode T. ………..…………………………………………………………………………………….. [1 mark] (d)
(i)
State the colour change (if any) to the copper (II) sulphate solution.
……….…………………………………………………………………………………….. [1 mark]
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Explain your answer in (d)(i)
……….…………………………………………………………………………………… ………..…………………………………………………………………………………… ……………………………………………………………………………………………. [2 marks] (f)
The above experiment is repeated by using carbon electrodes to replace the copper electrodes. (i)
Name the product formed at electrode U.
…………………………………………………………………………………………….. [1 mark] (ii)
Describe how you could verify the product formed in f(i)
…….……………………………………………………………………………………….. …….……………………………………………………………………………………….. …….……………………………………………………………………………………….. [2 marks]
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5.
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MOZ@C
Diagram 5 shows the set up of the apparatus and the magnification of the burette reading for the titration of 25.0 cm3 of potassium hydroxide solution and 1.0 mol dm -3 of hydrochloric acid using phenolphtalein as indicator.
0
25
1
26
Potassium hydroxide solution
Initial titration
Final titration
DIAGRAM 5 (a)
Complete the table below. Final burrett reading/cm
3
Initial burrette reading/cm3 Volume of acid/cm3 [2 marks] (b)
State the change of colour to the phenolphtalein indicator in the titration. ………………………………………………………………………………………………… [1 mark]
(c)
Write the chemical equation for the neutralisation reaction. ………………………………………………………………………………………………… [1 mark]
(d)
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Calculate the concentration of the potassium hydroxide solution in mol dm -3.
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[3 marks] The experiment above is repeated by using 1.0 mol dm of sulphuric acid to replace the hydrochloric acid to titrate the 25.0 cm 3 potasssium hydroxide solution. -3
(e)
(i)
State the volume of the sulphuric acid needed to titrate the potassium hydroxide solution. …………………………………………………………………………………………………… [1 mark]
(ii)
Explain your answer in (e) (i).
………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. [2 marks]
6. Diagram 6 shows the flow chart for the industrial manufacture of sulphuric acid.
Sulphur
+ O2 Heat
Sulphur dioxide
+ O2 Step X
Sulphur trioxide Step Y + H2SO4
Sulphuric acid
Oleum
DIAGRAM 6
(i)
Name the process of manufacturing sulphuric acid.
……………………………………………………………………………………………. [1 mark] (ii) Write a balanced chemical equation for Step X and Step Y. Step X: ………………………………………………………………………………………… Step Y: ………………………………………………………………………………………… [2 marks]
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(iii)
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State the three conditions required for the reaction in Step X. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. [3 marks]
(b)
Sulphuric acid reacts with aqueous ammonia to form ammonium sulphate, (NH 4)2SO4 salt. (i)
Name the reaction. ...................………………………………………………………......................................... [1 mark]
(ii)
State one use of ammonium sulphate in daily life? ……………………………………………………………………………............……....... [1 mark]
(iii)
Calculate the percentage of nitrogen in ammonium sulphate.
[Relative atomic mass : H, 1; O, 16; N, 14; S, 32 ]
[2 marks]
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Section B ( 20 marks ) Answer any one question from this section. The suggested time to answer section B is 30 minutes. 7.
Diagram 7 shows the formulae of 4 types of gases released during the eruption of a volcano.
N2
CO2
H2S
H2O
DIAGRAM 7
(a)
Calculate the molar mass of each gas shown in Diagram 7. [Relative atomic mass : H, 1; C, 12; O, 16; N, 14; S, 32 ] [4 marks]
(b)
Show that 0.9 g of water vapour contains the same number of molecules as in 2.2 g of carbon dioxide. 23 [Relative atomic mass: H, 1; C, 12; O, 16; Avogadro Constant, N A = 6.02 X 10 ] [4 marks]
(c)
A sample contains 0.1 mol carbon dioxide gas at room temperature and pressure. 3 [Relative atomic mass : C, 12; O, 16; 1 mol of gas occupies a volume of 24 dm at room 23 temperature and pressure; Avogadro Constant,NA = 6.02 X 10 ] Calculate: (i)
the volume,
(ii)
the mass,
(iii)
the number of molecules and
(iv)
the number of atoms
of the 0.1 mol carbon dioxide gas in the sample. [5 marks]
(d)
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At very high temperature, hydrogen sulphide gas released from the eruption of the volcano will react with oxygen in the air to produce sulphur dioxide and water vapour. Referring to the information above, (i)
write a balanced chemical equation to represent the reaction.
(ii)
calculate the maximum mass of sulphur dioxide produced if 952 g of hydrogen sulphide is released from the volcanic eruption. [7 marks]
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SULIT 8.
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MOZ@C Table 8.1 shows the electron arrangement for atoms P, Q dan R.
Element
Electron arrangement
P
2.8.1
Q
2.8.7
R
2.4
TABLE 8.1
(a) The reaction between atoms of P and Q form an ionic compound whereas the reaction between atoms of Q and R forms a covalent compound. Based on the above statement, explain how these ionic and covalent compounds are formed. [12 marks]
(b) Table 8.2 shows the melting point and boiling point of two chemical compounds at room temperature. O
O
Compound
Melting Point ( C)
Boiling Point ( C)
M
- 23
76.8
N
2030
2970
TABLE 8.2
Explain the differences in the melting point and boiling point of compound M and N with respect to the types of particles present and the types of bonding. [ 8 marks]
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Section C ( 20 marks ) Answer any one question from this section. The suggested time to answer section C is 30 minutes.
9.
(a)
What is the meaning of electrolyte? [2 marks]
(b)
Lead(II) bromide powder cannot conduct electricity but molten lead(II) bromide can conduct electricity.
Explain the above statement. [4 marks] (c)
A student has a spoon made of iron. He intends to beautify the spoon by electroplating it with a suitable metal. Design a laboratory experiment to electroplate the iron spoon. Your answer should consist of the following:
Chemicals required
Procedures of the experiment
Diagram showing the set-up of the apparatus
Half-equations involved in the reaction
Observation [10 marks]
(d) Electrolytic cell and voltaic cell are two types of cells. Draw one example of a voltaic cell and write the half equation for the reaction that occurs at the anode and cathode. [4 marks]
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SULIT 10. (a)
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MOZ@C Describe an experiment to prepare a dry zinc nitrate. Your answers should include the equations involved.
[10 marks ]
(b) Diagram 10 shows the arrangement of atoms in pure copper and brass.
pure copper
brass DIAGRAM 10
(i)
What is the meaning of alloy?
(ii)
State the three aims of alloying
[1 mark] [3 marks] (iii)
Brass is harder than pure copper. Explain. [6 marks]
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MOZ@C Name :…………………………………………………………
Class: ………….………
4541/3 KIMIA Kertas 3 Oktober 2008 1½ Jam BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA _______________________________________________ PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008
KIMIA KERTAS 3 Satu jam tiga puluh minit
JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1. Tuliskan nama dan tingkatan anda pada ruangan yang disediakan. 2. Kertas soalan ini adalah dalam dwibahasa. 3. Soalan dalam Bahasa Inggeris mendahului soalan yang sepadan dalam Bahasa Melayu. 4. Calon dikehendaki membaca maklumat di halaman 2 kertas soalan ini.
Untuk Kegunaan Pemeriksa Soalan
Markah Penuh
1
15
2
18
3
17
Jumlah
50
Kertas soalan ini mengandungi 10 halaman bercetak
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MOZ@C INFORMATION FOR CANDIDATES MAKLUMAT UNTUK CALON
1. This question paper consists of three questions. Answer all questions. Kertas soalan ini mengandungi tiga soalan. Jawab semua soalan. 2. Write your answers for Question 1 and Question 2 in the spaces provided in the question paper. Tuliskan jawapan bagi Soalan 1 dan Soalan 2 dalam ruang yang disediakan dalam kertas soalan. 3. Write your answers for Question 3 on the lined pages at the end of the question paper in detail. You may use equations, diagrams, tables, graphs and any other suitable methods to explain your answer. Tuliskan jawapan bagi Soalan 3 pada halaman bergaris di bahagian akhir kertas soalan ini dengan terperinci. Anda boleh menggunakan persamaan, gambar rajah, jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda. 4. Show your working. It may help you to get marks. Tunjukkan kerja mengira, ini membantu anda mendapatkan markah. 5. If you wish to change your answer, neatly cross out the answer you have done. Then write down the new answer. Sekiranya anda hendak menukar jawapan, batalkan jawapan yang telah dibuat. Kemudian tulis jawapan yang baru. 6. Diagrams in the questions are not drawn to scale unless stated. Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakan sebaliknya. 7. Marks allocated for each question or part questions are shown in brackets. Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkan dalam kurungan.
8. Time suggested for answering Question 1 and Question 2 is 45 minutes and Question 3 is 45 minutes. Masa yang dicadangkan untuk menjawab Soalan 1 dan Soalan 2 ialah 45 minit dan Soalan 3 ialah 45 minit. 9. You may use a non-programmable scientific calculator. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.
10. Hand in this question paper at the end of the examination. Serahkan semua kertas jawapan anda di akhir peperiksaan.
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MOZ@C Marks awarded :
Mark
Description
3
Excellent: The best response
2
Satisfactory : An average answer
1
Weak : An inaccurate response
0
No response or wrong response
Pemberian Markah :
Skor
Penerangan
3
Cemerlang: Respons yang paling baik
2
Memuaskan: Respons yang sederhana
1
Lemah: Respons yang kurang tepat
0
Tiada respons atau respons salah
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SULIT For examiner’s use
MOZ@C Answer all questions 1. An experiment was carried out by a group of students to determine the melting point th th of acetamide. Diagram 1 shows the thermometer reading at the 4 and the 6 minute of the experiment when acetamide was heated in a boiling tube until above its melting point. 100
100
90
90
80
80
Thermometer reading at the 4th minute
Thermometer reading at th the 6 minute
DIAGRAM 1 (a) Time /min
0
½
1
1½
2
2½
3
3½
27.0
36.0
50.0
66.0
82.0
82.0
82.0
82.0
4
4½
5
5½
6
84.0
88.0
92.0
o
Temperature/ C
Time /min Temperature/ o C
TABLE 1 Table 1 shows the results of the experiment. Based on Diagram 1, complete the th th table to show the temperature at the 4 and the 6 minute.
1(a)
[3 marks]
1(b)
(b)
On the graph paper provided, draw the graph of temperature against time based on the collected data. [3 marks]
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For
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SULIT For examiner’s use
MOZ@C (c)
1(c)
Use the graph in (b) , to determine the melting point of acetamide. Show on the graph how you determine this melting point. ……………………………………………………………………………… [3 marks]
(d)
The temperature did not change from the 2 nd minute until the 4 th minute. Explain why. ………………………………………………………………………………… …………………………………………………………………………………
1(d)
………………………………………………………………………………… [3 marks]
(e) Acetamide is an example of a covalent compound and sodium chloride is an example of an ionic compound. Classify the following compounds into covalent compounds and ionic compounds. Magnesium chloride Tetrachloromethane Zinc sulphate
Carbon dioxide Methylbenzene Copper(II) nitrate
1(e) [3 marks]
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MOZ@C 2. The reactivity of alkali metals with water depends on their position in Group 1 of the Periodic Table of the Elements. Diagram 2 below shows the set up of the apparatus for an experiment to determine the reactivity of the alkali metals with water. alkali metal
basin filled with water
DIAGRAM 2
The experiment is carried out by using lithium, sodium and potassium to react with water respectively. Observation of the experiment is shown in Table 2.1 below. ALKALI METAL
OBSERVATION
Lithium
The lithium metal moves slowly on the surface of the water.
Sodium
The sodium metals moves faster on the surface of the water with “hissing” sound.
Potassium
The potassium metal moves the fastest on the surface of the water.
TABLE 2.1
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SULIT For examiner’s use
MOZ@C (a)
Complete Table 2.2 below based on the experiment.
Name of variables (i) Manipulated variable ............................................................
Action to be taken (i) The way to manipulate variable ........................................................
............................................................
.........................................................
............................................................
.........................................................
(ii) Responding variable ............................................................ ............................................................
.........................................................
.............................................................
..........................................................
(iii) Fixed variable .............................................................
2(a)
(ii) What to observe in the responding variable
(iii) The way to maintain the fixed variable
.............................................................
.........................................................
............................................................
.........................................................
[6 marks] TABLE 2.2
(b)
2(b)
State the hypothesis for the experiment above. …………………………………………………………………………………….. …………………………………………………………………………………….. [3 marks]
(c)
Based on Table 2.2, arrange the alkali metals in descending order of reactivity of the metals with water.
2(c)
……………………………………………………………………………… [3 marks]
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For examiner’s
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MOZ@C (d)
For examiner’s use
The proton number of the alkali metals increase in the order: Lithium
→
Sodium
→
Potassium
State the relationship between the position of the alkali metals in Group 1 and their reactivity. ………………………………………………………………………….................. …………………………………………………………………………………….. …………………………………………………………………………………….. [3 marks]
(e)
2(d)
Rubidium is an alkali metal located below potassium in Group 1 . Predict the reactivity of rubidium with water. ……………………………………………………………………………… [3 marks]
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2(e)
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3.
The distance of pairs of metals in the electrochemical series influenced the voltage values in different electrochemical cells. Based on the statement above, plan a laboratory experiment to construct an electrochemical cell to determine the factor that influences the differences in the voltage values. Your planning should include the following: (i)
Statement of the problem
(ii)
All the variables
(iii)
Hypothesis
(iv)
List of materials and apparatus
(v)
Procedure
(vi)
Tabulation of data
[17 marks]
END OF QUESTION PAPER
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SULIT 4541/1 Kimia Oktober 2008
4541/1/2/3
BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSI A
PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN EMPAT 2008 SBP
KIMIA Peraturan pemarkahan Kertas 1, 2 dan 3
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MOZ@C
Paper 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
B C A D C A C D D B C D B D A A B C C A
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
D D B B C A B C C D D A B B A C D A D B
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41 42 43 44 45 46 47 48 49 50
B B C C C B C C B B
SULIT
MOZ@C Marking Scheme Paper 2 Section A
No
MARKING CRITERIA
MARK SUB SUB 1 1 1
1(a)(i) (ii) (iii)
2.7 14 24
1(b)(i) (ii) (iii) (iv) (v)
Reddish brown gas formed Diffusion Molecules Liquid → gas Bromine has low boiling point
1 1 1 1 1
TOTA TO TAL L
3
5
1(c)
1 1
2
10 2(a)
A chemical formula that gives the simplest whole number ratio of atoms of each element in the compound.
1
1
2(b)
Burning excess hydrogen
Oxide of copper
Dry hydrogen gas Heat
- functional
1
- label( oxide of copper, dry hydrogen gas and heat)
1
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SULIT 2(c)
MOZ@C ●Remove all the air from the apparatus before the oxide of copper is heated ●The flow of hydrogen gas is continued throughout the cooling of the product Any one answer correct
2 d(i)
1
mass mass of copper copper : 38.76 38.76 – 36.2 36.20 0 = 2.56 2.56g g mass of oxygen oxygen : 39.40 39.40 – 38.76 38.76 = 0.64g 0.64g Calculation + mass including unit Cu 2.56/6 2.56/64 4 0.04 1
2 d(ii)
: O : 0.64/1 0.64/16 6 : 0.04 : 1
CuO + H2
2(e)
1
1
CuO
2d(iii)
2(f)
1
Cu + H2O
1
3
1
1
No.
1
Magnesium is more reactive than hydrogen.// Magnesium is above hydrogen in the Reactivity Series.
1
2
10
3(a)
W T V
1 1 1
3
2+
1
1
3 (b)
P
3(c)
R
1
1
3(d)
● The atoms have the same valence electron.
1 1 1
3
● alkaline ● R is more reactive reactive than Q
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MOZ@C
3(e)
V, U, P and T
1
1
3(f)
Forms coloured compound compound/ion//c /ion//can an act as catalyst//h catalyst//has as variable variable oxidation number
1
1
10
4(a)
U
1
1
4(b)
copper (II) ion, suphate ion,hydrogen ion,hydroxide ion a: symbol
1
1
4(c)(i) (ii)
brown solid is deposited//electrode T becomes thicker 2+ Cu + 2e Cu
1 1
2
4(d) (i) (ii)
The intensity of blue colour solution remains unchanged 2+ The rate of Cu ion discharged at the cathode same with the rate 2+ of Cu ion formed at the anode 2+ The concentration / no.of Cu ion remains unchange d
1 1 1
3
oxygen gas Put a glowing wooden splinter near/into the mouth of the test tube lighted up/rekindled
1 1 1
3
4(f)(i) (ii)
10
5(a) 3
Final burrett reading/cm 3 Initial burrette reading/cm 3 Volume of acid/cm
25.55 0.55 25.00
1 1
2
5(b)
pink to colourless
1
1
5(c)
HCl + KOH → KCl + H2O
1
1
5(d)
MaVa MbVb
1
= 1 1
1
1.0 x 25.0 = 1 Mb x 25.0 1 -3
Mb = 1.0 mol dm
SMS MUZAFFAR5SYAH , MELAKA
1
3
SULIT 5(e)
MOZ@C 3
12.5 cm Sulphuric acid is a diprotic acid. + has 2 times the concentration of H hydrocholric acid.
ions compared to
1 1 1
3
10
6(a)(i) (ii) (iii)
Contact Process
1
2SO2 + O2 → 2SO3 SO3 + H2SO4 → H2S2O7
1 1
Catalyst: vanadium (V) oxide o o Temperature: 450 C – 550 C Pressure : 1 atm
1 1 1
Neutralization Fertilizer % of Nitrogen =
1 1
(i)
6(b) (i) (ii) (iii)
14X2 --------------------------- X 100 14(2)+1(8)+32+16(4)
= 28 ----- X 100 32 = 21.21%
6
1
1
4
10
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MOZ@C
Section B No 7 (a)
7(b)
MARKING CRITERIA
MARK
1. N2 : 2 X 14 = 28
SUB 1
2. CO2 : 12 + 2(16) = 44
1
3. H2S : 2(1) + 32 = 34
1
4. H2O : 2(1) + 16 = 18
1
1 moles of water vapour = 0.9 18 = 0.05
1
2 no. of molecules = 0.05 moles X 6 X 10 22 = 3 x 10
TOTAL
4
23
1
3 moles of CO 2 = 2.2 44 = 0.05 moles
1
4 no. of molecules = 0.05 moles X 6 x 10 22 = 3 x 10 7(c)(i)
(ii)
Volume = 0.1 X 24 3 3 = 2.4 dm // 2400cm
1
4
1
(ii)
Mass = 0.1 X 44 = 4.4g
(iii)
No. of molecules = 0.1 X 6.02 X 10 22 = 6.02 X 10
(iv)
No. of atom = 3 X 0.1 X 6.02 X 10 23 = 1.806 X 10 2 H 2S + 3 O2 → 2SO2 + 2H2O Correct formula of reactant and product Correct no. of mol of reactant Correct no. of mol of product 1. Moles of H2S = 952 34 = 28
7d(i)
23
1
23
1
22
1 1 1 1 1 1
2. 2 moles of H 2S produced 2 moles SO2 28 moles of H 2S produced 28 moles of SO 2
1 1
3. mass of SO 2 =
1
28 x [ 32 + 2(16) ] = 1792 g
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7
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MOZ@C 20
8(a)
Between P and Q 1
Atom P has 1 valence electron
Atom P loses/donates/transfers 1 electrons to form P ion
+
1
// +
P P + e- and attain stable octet electron arrangement
Atom Q has 7 valence electrons
Atom gains/receives/accept 1 electron to formQ ion//
1 -
-
Q + e-Q
1
attain the stable /octet electron arrangement The two oppositely-charged ions// the P
+
-
and Q ion are
bonded together by a strong electrostatic force
1 1
To form a ionic compound with the formula PQ // 1
Diagramn
P
Between Y and Z
Atom R has 4 valence electrons and atom Q has 1 valence electrons
One atom R contributes 4 electrons and (each) atom Q
1
1
contributes one electron for sharing
Atom R shared 4 pairs of electron with 4 atoms Q
1
to attain a octet /stable electron arrangement respectively
1
Diagram
1
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MOZ@C
Q
Q
R
Q
Q
12
8(c)
Compound M is an ionic compounds
1
Compound N is a covalent compounds
Compound M has high melting and boiling point
1 1
Compound N has low melting and boiling point
1
Strong electrostatic force of attraction exists between
1
the ions /the oppositely-charged ions in compound M
Weak intermolecular forces //held together by weak (Van
1
der Waals) force of attractions between molecules in compound N
A lot of heat energy // high of energy is required to break
1
the strong forces in the compound M ● little heat energy //low energy is needed to overcome the weak forces in the compound N
1 8
20
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MOZ@C
Section C No 9(a) 9(b)
9(c)
9(d)
MARKING CRITERIA
1.Electrolyte is an ionic compound that can conduct electricity 2.in the molten state or aqueous solution. 1. In powdered form, lead(II) ions and Bromide ions cannot move freely. 2. The ions are held together with strong electrstatic forces 3. In molten state, the ions can move freely. 4. The free moving ions carry the electrical charges. 1. Chemicals required: silver nitrate solution, silver plate,
Procedures: 3 -3 2. [50 – 200]cm of [0.5 – 2.0] mol dm of silver nitrate solution is poured into a beaker. 3. The silver plate is the anode and the iron spoon is the cathode. 4. The silver plate and the iron spoon are connected to the battery with the connecting wires. 5. The silver plate and the iron spoon are then dipped into the silver nitrate solution. 6. [complete and functional set-up of apparatus] 7. [labels: at anode: silver plate, at cathode: iron spoon, electrolyte: silver nitrate solution} + 8. Half equation at anode: Ag → Ag + e + 9. Half equation at cathode: Ag + e → Ag 10. Observation: iron spoon is covered with grey, silvery/shiny deposit. 1. [one example of voltaic cell with complete and functional set-up of apparatus: 2. [Labels: at anode: more electropositive metal,eg. Zinc at cathode: less electropositve metal, eg. Copper] a suitable electrolyte, eg. Copper(II) sulphate solution] 2+ 3. Half-equation at anode: Zn → Zn + 2e 2+ 4. Half-equation at cathode: Cu + 2e → Cu
10SYAH , MELAKA SMS MUZAFFAR
MARK SUB 1 1 1 1 1 1
TOTAL 2
4
1 1 1 1 1 1 1 1 1 1
10
1
1 1 1 4 20
SULIT
No 10(a)
MOZ@C
MARKING CRITERIA
MARK
1 Name of suitable reactant e.g: zinc/zinc oxide/zinc carbonate
SUB 1
TOTAL
and nitric acid 3
-3
2 [50-200] cm of [0.1-2.0 ]moldm of nitric acid is poured into a beaker
1
3 Heat /Warm the acid
1
4 Add in zinc/zinc oxide/zinc carbonate into the acid bit by bit until in excess/ no longer dissolves
1
5 Stir the mixture and filter
1
6 The filtrate is poured into an evaporating dish.
1
7 heat until saturated
1
8 The solution is allowed to cool
1
9 The crystals formed are filtered and by compressing/pressing between 2 sheets of filter paper.
1
10 Suitable chemical equations e.g ;
1
ZnCO3
+
2HNO3
Zn(NO3)2
+ H 2O
+
CO2
An alloy is a mixture of two or more elements with a certain fixed composition in which the major component is a metal
1
(ii)
To increase the strength/ hardness of a pure metal increase the resistance to corrosion of a pure metal To improve the appearance of a pure metal
1 1 1
(iii)
In pure copper,atoms are of the same size atoms are orderly arranged in layers the layers of atoms can slide over each one another when a force is applied
1 1 1
In brass, atoms of tin and copper have different size the presence of tin atoms disrupt the orderly arrangement of the copper atoms. The layers of copper atoms are more difficult to slide over each other.
1
10b(i)
10
To
1 1 10 20
11SYAH , MELAKA SMS MUZAFFAR
SULIT
MOZ@C Marking Scheme Paper 3
1 (a) KK0503 – Measuring and using numbers EXPLANATION [Able to write both temperatures with correct to 1 decimal place]
SCORE 3
temperature reading : 82.0 °C temperature reading : 97.0 °C 2
[Able to record all the volumes accurately but without decimal place]
temperature reading : 82 temperature reading : 97 [Able to write at least one reading of the temperature accurately] No response given / wrong response
1 0
1 (b) KK0506 – Communicating EXPLANATION [ Able to draw a graph of temperature against time of the experiment on the same axes with all the 4 items below correctly ] (i) axes labelled correctly with units (ii) suitable scale used (iii) all points plotted correctly (iv) smooth curve of graph and more than ½ size of graph paper
SCORE
[ Able to draw a graph of temperature against time of the experiment on the same axes with all the 3 items correctly ]
2
[ Able to manipulate two items correctly ] No response or wrong response
1 0
12SYAH , MELAKA SMS MUZAFFAR
3
SULIT
MOZ@C
1 (c)KK0505 – Predicting EXPLANATION [Able to state the temperature correctly and able to show the how the melting point is determined on the graph] Answer: 82 .0
SCORE 3
o
82 C melting point
[Able to state the temperature but without unit and did not label melting point on the graph correctly] Answer: 82
2
Melting point
[Able to state the temperature but without unit and did not show the melting point on the graph] Answer: 82 No response given / wrong response
1
0
1 (d) KK0508 – Interpreting Data EXPLANATION [Able to interpret the data accurately] Suggested answer: The heat energy absorbed is used to overcome the forces of attraction/bonds between the molecules of acetamide [Able to give correct interpretation but less accurate] Suggested answer: The heat energy is used to overcome the forces of attraction of molecules / particles of acetamide [Able to give an idea] Suggested answer: The heat energy is used / absorbed. No response given / wrong response
13SYAH , MELAKA SMS MUZAFFAR
SCORE 3
2
1
0
SULIT
MOZ@C
1 (e) KK0505 – Classifying EXPLANATION [Able to classify the ionic and covalent compounds correctly] Ionic
Covalent
Magnesium chloride Copper(II) nitrate Zinc sulphate
Methylbenzene Tetrachloromethane Carbon dioxide
SCORE 3
[Able to state at least two pairs correctly // correct grouping but wrong heading or vice versa ]
2
[Able to state one pair correctly in a correct grouping]
1
No response given / wrong response
0
2(a) KK0510 - State the variables EXPLANATION [Able to state the three variables and action to be taken correctly] Name of variables Action to be taken (i) Manipulated variable: (i) The way to manipulate Type of group 1 metals variable: used Use lithium, sodium and potassium metal for each experiment. (ii) Responding variable: Rate of reaction//Reactivity of the reaction
(iii) Fixed variable: Quantity/size of metal used.
SCORE 6
(ii) What to observe in the responding variable: The movement of metal on the water surface. (iii) The way to maintain the fixed variable: Use the same quantity/size of metal.
[Able to state any five items correctly] [Able to state any four items correctly] [Able to state any three items correctly] [Able to state any two items correctly] [Able to state any one item correctly] No response given / wrong response
14SYAH , MELAKA SMS MUZAFFAR
5 4 3 2 1 0
SULIT
MOZ@C
2 (b) KK0512 – Stating hypothesis EXPLANATION [Able to state the relationship between manipulated variable and responding variable correctly] Suggested answer: The metal which is below in Group 1 is more reactive in the reaction with water//The lower the metal in Group 1 the more reactive is the reaction with water. [Able to state the relationship between manipulated variable and responding variable but in the opposite direction] Suggested answer:
SCORE 3
2
The more reactive the reaction, the lower the position of the metal in Group 1
[Able to state an idea of the hypothesis] Suggested answer: Metals in Group 1 can react with water No response given / wrong response
1
0
2(c) KK 0508 – Interpreting Data EXPLANATION [Able to arrange the metals in descending order based on their reactivity] Suggested answer: K, Na, Li [Able to arrange the metals in ascending order based on their reactivity] Answer: Li, Na, K, [Able to arrange the position of at least two metals in descending/ascending] Suggested answer: Na, Li, K// Li, K, Na// Na, K, Li No response given / wrong response
SCORE 3
2
1
0
2(d) KK0507- Making relationship EXPLANATION [Able to state the relationship accurately] Suggested answer: The lower the position of the metal in Group 1, the higher the reactivity of the metal. [Able to state the relationship correctly but less accurate] Suggested answer: The reactivity of the metals is inversely proportional to their position in the group. [Able to state an idea of a relationship] Suggested answer: Position of metals affect the reactivity No response given / wrong response
15SYAH , MELAKA SMS MUZAFFAR
SCORE 3
2
1
0
SULIT
MOZ@C
c2(e) KK 0508 – Predicting EXPLANATION [Able to predict the reactivity of rubidium correctly] Suggested answer: The reaction of Rubidium is most reactive among lithium, sodium and potassium when react with water [Able to predict the arrangement of the metals based on their reactivity] Suggested answer: The reaction of Rubidium is most reactive. [Able to give an idea Suggested answer: Rubidium is a reactive metal No response given / wrong response
SCORE 3
2
1
0
3.(a) KK051021 – Statement of the problem EXPLANATION [Able to make a correct statement of problem] Suggested answer: Does the distance between two/ pair of metals in the electrochemical series give different voltage values? [Able to make a statement of the problem or suitable aim] Suggested answer: Does the distance between two /pair of metals give different voltage values?// Distance between two/pair of metals in the electrochemical series gives different voltage values. [Able to state an idea of statement of problem or aim] Metals influence the voltage values No response given / wrong response
SCORE 3
2
1 0
3 (b) KK051202 – Stating variables EXPLANATION [Able to state all the three variables correctly] Suggested answer: Manipulated variable : types of pairs of metals Responding variable: voltage values//potential difference Constant variable : electrolyte used such as copper(II) sulphate solution. [Able to state any two of the variables correctly] [Able to state one of the variables correctly or state idea regarding variable] No response given / wrong response
16SYAH , MELAKA SMS MUZAFFAR
SCORE 3
2 1 0
SULIT
MOZ@C
3(c) KK051202 – Stating hypothesis EXPLANATION [Able to state the relationship between manipulated variable and responding variable correctly] Suggested answer: The further the distance/position between two metals in the electrochemical series, the bigger the voltage value. [If the responding variable comes first, the score is 2] [Able to state the relationship between manipulated variable and responding variable] Suggested answer: The further the distance /position between two metals, the bigger the voltage value// vice versa [Able to state an idea of the hypothesis] Suggested answer: Metals influence the voltage value No response given / wrong response
SCORE 3
2
1
0
3(d) KK051205 – List of materials and apparatus EXPLANATION [Able to state the list of materialss and apparatus correctly and completely] Suggested answer: Beaker, connecting wires, crocodile clips, voltmeter, sand paper, [magnesium ribbon, zinc strip,lead strip, copper strip], [copper(II) sulphate solution] [Able to state the list of substances and apparatus correctly but not completely] Suggested answer: Beaker, connecting wires, voltmeter, [magnesium ribbon, zinc, copper],[copper(II) sulphate solution] [Able to state an idea about the list of substances and apparatus] Suggested answer: Beaker, metals, voltmeter, electrolyte, wire. No response given / wrong response
17SYAH , MELAKA SMS MUZAFFAR
SCORE 3
2
1
0
