2. Some of the differences between solids, liquids, and gases.
3. How to change solids to liquids and gases and vice versa.
4. The reason for the changes of size of a body on heating.
5. Why cooling a gas tends to change it to a liquid or a solid.
6. The actual size of molecules.
Which of the following changes are chemical and which physical?
Give reasons.
1. Melting of ice.
2. Burning of a candle.
3. Production of steam.