1 The particles in liquids and gases show random motion. What does that mean, and
why does it occur?
2 Why does the purple colour spread when a crystal of potassium manganate (VII) is
placed in water?
3 Bromine vapour is heavier than air. Even so, it spreads upwards in the experiment
above. Why?
4 a) What is diffusion?
b) Use the idea of diffusion to explain how the smell of perfume travels.
5 Write down two properties of a solid, two of a liquid, and two of a gas.
6 Which word means the opposite of:
a) boiling?
b) melting?
7 Which has a lower freezing point, oxygen or ethanol?
8 Which has a higher boiling point, oxygen or ethanol?
9 Look at the heating curve below.
a) About how long did it take for the ice to melt, once melting started?
b) How long did boiling take to complete, once it started?
c) Try to think of a reason for the difference in a and b.
10 Use the idea of particles to explain why:
a) solids have a definite shape
b) liquids fill the bottom of a container
c) you cannot store gases in open containers
d) you cannot squeeze a sealed plastic syringe that is completely full of water
e) a balloon expands as you blow into it.
4(a) what are your roles as citizen of Uganda? (b) Each and every individual in…
3(a) why do we political Eduction in the New Uganda curriculum? (b) Explain the roles…
2(a) Describe the creation story in relation to the origin of man. (b) Explain why…
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