Answer: A solid precipitate formed.
The color changed.
A gas was produced.
The reaction absorbed or released heat.
Explanation:-
A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.
A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.
Indicators of a chemical change are:
1. formation of precipitate
2. Absorption or release of energy
3. Evolution of gas
4. Change in color