Classify the following into physical and chemical changes.
(a) Expansion of metals on heating
(b) Crystallization of salts from their solutions
(C ) Blackening of silverware
(d) Ripening of fruits
(E ) Cooking of food
(F) Melting of ice

Explanation

To classify the given changes into physical and chemical changes, we will analyze each change based on whether it involves a change in composition or not.

### Step-by-Step Solution:

1. **Expansion of metals on heating**:
- When metals are heated, they expand due to increased kinetic energy of their particles. However, the chemical composition of the metal remains unchanged.
- **Classification**: Physical Change

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