Question

define chemical and physical changes shortly​

Answer 1

Answer:

Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.) In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s). Physical change is easily reversible i.e original substance can be recovered.

Answer 2

Physical changes :

1. The chemical composition of a substance does not change.

2. Most changes are reversible.

3. No new substances are formed. For example,

Ice - Water - Steam

Chemical changes :

1. The chemical composition of a substance changes.

2. Most changes are irreversible.

3. New substances are formed. For example,

Paper - Ashes