Gr 10 Past Paper Question Booklet

Gr 10
Physical
Sciences




Past
Paper
Booklet
1

, CONTENTS PAGE


Part 1: chemistry
Pages

1. Matter and materials; the atom; bonding
2. Physical and chemical change
3. Chemical systems



Part 2: Physics
Pages

1. Waves, Light and Sound
2. Electromagnetic radiation and magnetism
3. Electrostatics
4. Electric circuits
5. Mechanics
6. Mechanical energy




2

,Part 1: Chemistry – Matter and Materials; the atom; bonding
(June 2018 Q2)

1.1 The following graph, not drawn to scale, represents the cooling curve of a
substance with a boiling point of 95⁰C.




1.1.1 Define temperature. (2)

1.1.2 Name the phase of the substance between times t 0 and t1. (1)

1.1.3 Write down the freezing point of this substance. (1)

1.1.4 Name the process taking place between t1 and t2. (1)

1.1.5 Use the Kinetic Molecular theory to explain the process mentioned in
question 1.1.4. (2)

1.1.6 In what state of matter is the substance after time t3? (1)

1.2 Consider the following statements, and answer the questions that follow:

a) Boiling is the same as evaporation due to associated phase change.
b) Evaporation and boiling have the same phase change, but boiling occurs
at specific temperature.
1.2.1 Define boiling point. (2)
1.2.2 Which statement is correct? Explain. (3)
[13]
(June 2018 Q3)
2.1 Study the following processes and answer the questions that follow:




2.1.1 Identify the process that represents a chemical change. (1)

3

, 2.1.2 Identify the process that represents a physical change. (1)

2.1.3 Are the above processes endothermic or exothermic? Provide a reason
for the answer. (2)

2.2 Name the following compounds:
a) HBr (1)

b) CCl4 (2)

c) Na2S2O3 (2)

2.3 Balance the following reactions:

a) Fe + O2 → Fe2O3 (2)
b) C2H6 + O2 → CO2 + H2O (2)
c) Na2SO4 + Ba(NO3)2 → BaSO4 + NaNO3 (2)

2.4 Consider the following chemical reaction:
2HNO3 (aq) + Ca(OH)2 (aq) → Ca(NO3)2 (aq) + 2H2O (l)
a) State the law of conservation of mass. (2)
b) Show that the reaction obeys the law of conservation of mass. (3)
[20]
(June 2018 Q4)
3.1 Magnesium is an element, with an atomic number of 12 and naturally exists
as isotopes.

3.1.1 What are isotopes? (1)
24Mg, 25Mg
Magnesium consists of 3 naturally occurring isotopes: and 26Mg

Isotope % abundance Atomic Mass number
24Mg 78,99 23,985
25Mg 24,959
26Mg 11,01 25,983


3.1.2 Name the group in which magnesium is found. (1)

3.1.3 Name the element that has the same number of electrons as there are
core electrons in magnesium. (1)

3.1.4 Calculate the number of neutrons in 26Mg. (1)
25
3.1.5 Calculate the percentage abundance of Mg. (1)

3.1.6 Determine the relative atomic mass of Magnesium. (4)

4