MBRIDGE FA

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OR
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Cambridge Factor is the part of Edusiswa

International Olympic Commitee

INTERNATIONAL CAMBRIDGE FACTOR OLYMPIAD

Chemistry Practice Paper Grade 10
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CAMBRIDGE FACTOR EDUSISWA
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1. How to use this self-tryouts:

a. Try working on the following question packets
without the assistance of a teacher, parent,
friend, book, internet or any other learning
resource.
b. Set your timer to 60-minute and try to finish it

BRIDGE F
on time.
M
CA is on the final page;
c. The answer key A please
correct it yourself.
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2. Medals can be obtained based on the following
OR
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scores:
OLYMP

a. Gold medal is awarded for a score of 95-100.

b. Silver medal is awarded for a score of 85-94
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c. Bronze medal is awarded for a score of 75-84

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States of matter
1. Figure 4 shows the state of the three different substances
before heating, when hot and after cooling.

M BRIDGE F
A A
What name is given to the process when the chocolate
changes from a solidCto a liquid?
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a. Condensing OR
NATION

b. Evaporating
c. Freezing
OLYMP
d. Melting
2. The three states of matter are solid, liquid and gas. What is
R

the name of the change of state when a liquid changes into a

E

solid?
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A
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a. Condensation
D
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b. Evaporation
ED
c. Freezing U SIS W A
d. Melting
3. Look at this picture.
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Which of the following substances will be a solid at 20 °C and

will melt when placed in a beaker of hot water at 80 °C?
a. A
b. B
c. C
d. D
4. Figure below shows the changes of state for gallium and the
arrangement of particles in liquid gallium. Which of the
following can fill the Y? MBRIDGE F
CA A
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OR
NATION

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a. Condensing
b. Evaporating
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c. Freezing
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d. Melting
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D
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5. Here are five statements about ice and water. Place ticks in
ED
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boxes by the two statements that are correct.
a. The molecules move faster in water than in ice
b. The molecules are more randomly arranged in ice than
in water
c. The molecules start moving when water becomes ice
d. The molecules have more energy in ice than in water
6. A group of friends sit sharing a special meal together. When
the food was put on the table, they could all smell the
appetizing food. How did the smell reach them when the dishes
were placed on the table?
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a. Decomposition
b. Diffusion
c. Distillation
d. Decolorization
7. The figure shows one of the changes of physical state.

MBRIDGE F
CA A
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Which change of state is shown? OR
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a. Boiling
b. Condensation
OLYMP
c. Melting
d. Evaporation
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8. The figure shows ice cubes floating on the surface in a glass

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of fizzy drink.
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A
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In which of A-D are the particles close together but free to

move past each other?
a. Bubbles
b. Glass
c. Drink
d. Ice cubes
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9. Look at the picture.

M BRIDGE F
CA A
Which of A-D in the figure shows the process of diffusion?
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a. A OR
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b. B
c. C
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d. D
10. Separating sand from salt is a commonly used
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demonstration of the first stages of a purification process. The

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diagram shows the first step in the process.

T

A
N

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U SIS W A

What is the next step?

a. Filter the mixture
b. Evaporate the water
c. Carry out chromatography
d. Freeze the mixture
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11. An atom of any element must contain equal numbers of the

following:
a. Electrons, neutrons and protons.
b. Electrons and protons.
c. Neutrons and protons.
d. Electrons and neutrons.
12. The diagram shows one of the ways of representing an

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atom, in this case an atom of element X.
M
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OR
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To which group of the Periodic Table does X belong?

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a. 2
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b. 0
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c. 3
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d. 6
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13. The reactivity of elements within a group in the Periodic
Table changes with their position in the group.
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What is the order of increasing reactivity of the elements in

Group I and in Group VII?
a. A
b. B
c. C
d. D
14. What is the order of increasing reactivity of the elements in

BRIDGE F
Group I and in Group VII?
M
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OR
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And this following table is the relevant statement.

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ER

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A
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Which of the elements V, W, X or Y is a metal and which is a
non-metal?
a. A
b. B
c. C
d. D
15. Elements in the same group of the Periodic Table have
similar properties. Element X is a colorless, unreactive gas.
Which group of the Periodic Table is X in?
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a. Group VI
b. Group 0
c. Group I
d. Group VII
16. The structure of any atom is essentially defined by two
numbers. How many protons, neutrons and electrons are
present in an atom of the element with proton (atomic)

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number 6 and nucleon (mass) number 14?
M
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OR
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a. A
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b. C
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c. B
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d. D
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17. Metals usually form compounds involving ionic bonding.
How do metals form their ions?
a. By gaining protons
b. By losing electrons
c. By gaining electrons
d. By losing protons
18. Chlorine is a highly reactive non-metal. What particles are
gained by chlorine when it reacts with potassium?
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a. Protons
b. Electrons
c. Atoms
d. Ions
19. How many covalent bonds does carbon form?
None, it does not form covalent bonds.
a. 2

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b. 3
M
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c. 4
d. 5
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20. The structure normally associated with ionic bonding is ... OR
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a. A giant lattice.
b. A simple molecule.
OLYMP
c. A giant molecule.
d. A regular arrangement of ions surrounded by a sea, or
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cloud, of electrons.
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21. All the substances listed are solids at room temperature.

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A
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Which substance has a simple molecular structure?

D
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a. Sodium
ED
b. Iodine U SIS W A
c. Carbon (graphite)
d. Strontium
22. Magnesium is in group 2 in the periodic table. Which of the
following formulas for magnesium compounds is correct?
a. MgO2
b. MgS 2
c. MgF 2
d. Mg 2 O
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23. Why does sodium chloride not conduct electricity in its solid
form?
a. Ions in its structure are in fixed positions.
b. It contains no free electrons.
c. It has a giant covalent molecular structure.
d. Ions in its structure only have single negative and single
positive charges.

M BRIDGE F
24. Which of the following statements explains why silicon
CA point?
dioxide has a high melting A
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a. It has a giant ionic structure with strong electrostatic OR
NATION

attraction between ions.

b. It has a giant covalent structure with strong covalent
OLYMP

bonds between atoms.

c. It has a simple molecular structure with weak forces
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between molecules.
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d. It has a giant metallic structure with a strong attraction

N

D
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between positive ions and the sea of electrons.

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25. Which of the following substances does not conduct
electricity?
a. Brass
b. Copper
c. Carbon (graphite)
d. Carbon (diamond)
26. Which of the following does not explain a substance
displaying a high melting point?
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a. Strong intermolecular forces between molecules.

b. Many strong covalent bonds.
c. Strong electrostatic attraction between oppositely
charged ions.
d. Strong electrostatic attraction between positive ions
and delocalized electrons
27. Which of the following does not contain ionic bonds?
a. Sulfur dioxide
MBRIDGE F
b. Sodium oxide A A
c. Silver oxide
C
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d. Strontium oxide OR
NATION

28. Which of the following does not contain covalent bonds?

OLYMP
a. Carbon (graphite)
b. Carbon (diamond)
c. HCl (g)
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d. NaCl (s)
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29. Which of the following does not have a giant structure?

N

D
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a. Diamond
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b. Graphite
c. Iodine
d. Silicon dioxide
30. Which of the following statements gives the best
explanation for the fact that carbon forms 4 bonds?
a. Carbon is in group 4 of the periodic table
b. Carbon has 2 shells of electrons.
c. Carbon forms 4+ ions.
d. Carbon has 4 electrons in its outer shell.
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ANSWER KEY
1. D
2. C
3. C
4. A
5. A
6. B
7. C
8. C
9. B
MBRIDGE F
CA A
10. A
11. B
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12. A OR
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13. B
14. D
OLYMP
15. B
16. A
17. B
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18. B
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19. C
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A
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20. A
D
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21. B
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U SIS W A
22. C
23. A
24. B
25. D
26. A
27. A
28. D
29. C
30. D