Name : ………………………………………………………(
)
Form : 4…………
Section A: Answer ALL questions. Blacken your answers in the spaces provided in page 3.
1. Which of the following should be done if a
hypothesis is rejected in an experiment?
A Collecting more data
B Make a new inference
C Make a new hypothesis
D Make a scientific theory
7.
2. The relative atomic mass of an element is the
number of times
A The mass of an atom is greater than the mass
of one carbon-12 atom
B The mass of an atom is greater than the mass
of one oxygen atom
C The mass of an atom is greater than 1/12 of
the mass of one carbon-12 atom
D The mass of a molecule is greater than 1/12 of
the mass of one carbon-12 atom
A sample of ammonia gas is cooled.
Which of the following is true about the velocity and
the size of its particles?
Velocity of the
particles
Size of the particles
A
Increases
Decreases
B
Increases
No change
C
Decreases
No change
D
Decreases
Decreases
8. Diagram below shows two types of gases filled in
two balloons.
3. A patient is diagnosed of having cancer. Which
isotope is used to treat the patient?
A
Carbon-14
B
Sodium-24
C
Phosporus-32
D
Cobalt-60
Which statement is correct about the number of
particles in argon gas?
[Relative atomic mass: Ar = 40, O = 16]
A Half of oxygen gas
B Same as in oxygen gas
C More than in oxygen gas
D Less than in oxygen gas
4. The proton number of atom R is 14 and its relative
atomic mass is 28.
Which statement is correct about R?
A The mass of 1 atom of R is 28 g
B The molar mass of R is 28 g mol-1
C 14 g of R contains 6.02×1023 atoms
D Atom R has 14 protons, 14 electrons, and 28
neutrons
9. Which pair of compound and its relative formula mass
is correctly matched?
[Relative atomic mass: Ba = 137, S = 32, O = 16,
Zn = 65, C = 12, Cl = 35]
5. Which of the following is a chemical reaction?
A Crumpling a sheet of paper
B Melting an ice cube
C Breaking a glass
D Burning of wood
A
B
C
D
6. Iodine-129 and iodine-131 are isotopes.
Which statement is correct?
[Proton number of iodine = 53]
A Iodine-129 has the same number of neutrons as
iodine-131
B Iodine-129 has less number of electrons than
iodine-131
C Iodine-131 has 53 electrons and 78 neutrons
D Iodine-129 has 53 protons and 76 electrons
Compound
Relative formula mass
BaSO4
ZnCO3
ZnCl2
ZnSO4
125
135
233
161
10. Diagram below shows the electron arrangement of a chlorine
atom.
1
Which inter-conversion involves the release of energy?
A Steam → Ice
B Water → Steam
C Ice → Water
D Ice → Steam
15. How many hydrogen molecules are there in 24 dm3 of
the gas?
[The molar volume of any gas is 24 dm 3 mol−1 at room
temperature and pressure; Avogadro constant: x mol−1]
A 12x
C 2x
B x2
D x
Which statement is true about this atom?
A The number of valence electrons is 17
B The total number of electrons is 7
C The nucleon number is 17
D The proton number is 17
11. The following statements refer to the contributions
of a scientist in the development of ideas about
atomic structure.



16. What is the mass of ethane gas, C2H6, which occupies
a volume of 498 cm3 at room temperature and pressure?
[Relative atomic mass: C = 12, H = 1;
Molar volume of gas = 24 dm 3 mol−1 at room
temperature and pressure]
A 0.62 g
C 358.56 g
B 14.94 g
D 622.50 g
Discovered proton
Most of the mass of the atom is in the nucleus
The electrons move in empty space
Who was the scientist?
A Neils Bohr
B John Dalton
C J.J Thomson
D Ernest Rutherford
17. How many carbon atoms will have the same mass
as six oxygen atoms?
[Relative atomic mass: C = 12, O = 16]
A 8
C 4
B 5
D 2
12. Which of the following particles contain 10 electrons?
[Proton number: , F = 9, Mg = 12, S = 16,K = 19]
I
K+
II Mg2+
III F−
IV S2A I and II
C
II and III
B I and III
D III and IV
18. A balloon contains 6.02 x 1021 of gas particles.
What is the number of moles of the gas in the
balloon?
A 0.01 mol
C 1.0 mol
B 0.1 mol
D 10.0 mol
13. What is the number of neutrons in the isotope of
uranium 235
92𝑈 ?
A 92
C 235
B 143
D 327
19. Which compound has the empirical formula of CH2O?
A HCOOH
B CH3COOH
C CH3COOCH3
D HCOOC2H5
20. An oxide of element X has the empirical formula of
X2O3. 2.24g of element X reacts completely with 0.96g
of oxygen.
What is the relative atomic mass of X?
[Relative atomic mass: O=16]
A 112
C 25
B 56
D 17
14. Diagram below shows the inter-conversion of the
states of matter of a substance.
2
Answer:
=A=
1
=A=
2
=A=
3
=A=
4
=A=
5
=A=
6
=A=
7
=A=
8
=A=
9
10 =A=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
=B=
=C=
=D=
11
12
13
14
15
16
17
18
19
20
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
=A=
=B=
=C=
=D=
Section B: Answer ALL questions in the spaces provided.
1. Table 1 shows the proton number and nucleon number of atom for the element carbon, oxygen, aluminium and
chlorine.
Elements
Proton Number Nucleon number
Carbon
6
12
Oxygen
8
16
Aluminium
13
27
17
Table 1
35
Chlorine
(a) What is meant by nucleon number?
[1 mark]
(b) (i) State the type of particles consists in aluminium metal.
[1 mark]
(ii) Draw the atomic structure for aluminium atom.
[2 marks]
(c) (i) Write the electron arrangement for oxygen atom.
[1 mark]
(ii) State the valence electron for oxygen atom.
[1 mark]
3
(d) Carbon-12 and Carbon-14 are the isotopes of carbon.
(i) What is meant by isotopes?
[1 mark]
(ii) State the use of carbon-14 in archeology field.
[1 mark]
(e) Based on the kinetic theory of matter, describe the arrangement and movement of particles of chlorine at room
temperature.
Arrangement of particles: ______________________________________________________________________
Movement of particles: ________________________________________________________________________
[2 marks]
2. Table 2 shows the melting point and boiling point of four substances.
Substances
W
Melting point (°C)
-10
Boiling point (°C)
60
X
800
1 400
Y
-95
-33
Z
80
140
Table 2
(a)(i) What is meant by melting point?
[1 mark]
(a)(ii) Draw the arrangement of particles of W at room temperature.
[1 mark]
(b)(i) Substance Z is a chemical compound named as acetamide.
Draw the set-up of apparatus to determine the melting point of substance Z.
[2 marks]
(b)(ii) Sketch the graph of temperature against time for substance Z when it is heated from room temperature until it
4
reaches a temperature of 100°C.
[3 marks]
(c) The smell of curry cooking in the kitchen spreads to the living room.
Based on the kinetic theory of matter, state the process involved.
Explain your answer.
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
[3 marks]
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