Question

1. Most of the chemical changes cannot be reversed and are called
changes.
2- Cooling and collecting of water vapour is called
3- When air is heated it becomes​

Answer 1

1. Most of the chemical changes cannot be reversed and are called irreversible  changes.

2. Cooling and collecting of water vapour is called condensation.

3. When air is heated it either increases in volume, increases in pressure or both, depending on the conditions.

Answer 2

Answer:

1. Most chemical changes cannot be easily reversed. Such changes are called irreversible changes.

2.The process of changing water vapour into water is called condensation. Condensation is simply the process of change of the vapour from gaseous state to liquid when comes in contact of cool surface.

3.When air is heated, it expands, becomes lighter and goes up.

Explanation:

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