1. Name the change of state from gas to liquid.

[1 mark]

2. Name the change of state from solid to liquid.

[1 mark]

3. Name the change of state from liquid to gas that occurs only at the surface of the liquid.

[1 mark]

4. Name the change of state from liquid to solid.

[1 mark]

5. Name the change of state from solid directly to gas, without becoming a liquid.

[1 mark]

1. State TWO differences between boiling and evaporation.

[2 marks]

2. Explain the difference between melting and dissolving.

[2 marks]

3. A student heats a beaker of water. The water reaches 100°C and starts to boil. State what happens to the temperature of the water while it continues to boil.

[1 marks]

4. Ice melts at 0°C and water boils at 100°C. Explain why the melting point and boiling point of pure water are fixed values.

[2 marks]

5. State what happens to the arrangement and motion of particles when a liquid freezes to form a solid.

[2 marks]

1. Wet clothes dry on a washing line. What process causes the clothes to dry?

[1 mark]

2. A student places a beaker of water in a freezer. After some time, the water turns to ice. Name the change of state that has occurred and state what happens to the volume of the water.

[2 marks]

3. A mirror in a bathroom becomes covered with water droplets when someone has a hot shower. Explain how this happens.

[2 marks]

4. Solid carbon dioxide (dry ice) is used in stage performances to create fog effects. The dry ice changes directly from solid to gas. Name this process and suggest why it is useful for stage effects.

[2 marks]

5. A puddle of water on a road disappears during a sunny day, even though the temperature does not reach 100°C. Explain why this happens.

[2 marks]