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2. State two characteristics of particles in:

a) Solids
Particles are closely packed and vibrate in fixed positions.

b) Liquids
Particles are close together but can slide past each other, taking the shape of the container.

c) Gases
Particles are far apart and move randomly and rapidly, filling the container.

3. Explain the effect of impurities on:

a) Boiling point
Impurities increase the boiling point.

b) Melting point
Impurities decrease the melting point.

4. State whether each of the following changes is physical or chemical.

• Melting ice: Physical change
• Rusting iron: Chemical change
• Burning paper: Chemical change
• Dissolving sugar in water: Physical change
• Cooking an egg: Chemical change

5. Differentiate between a physical change and a chemical change.
A physical change does not produce new substances and is often reversible. A chemical change produces new substances and is generally irreversible.

6. Complete the table below.

Change of State	Process
Solid → Liquid	Melting
Liquid → Gas	Evaporation
Gas → Liquid	Condensation
Liquid → Solid	Freezing

1. Name the components of the fire triangle.

a) Heat

b) Fuel

c) Oxygen

2. State four causes of fire in nature.

a) Lightning

b) Volcanic eruptions

c) Friction (e.g., rubbing rocks)

d) Spontaneous combustion of dry vegetation