Question

1. give one example of a physical change.
2. give one example of a chemical change.

Explanation:

Question 24

A physical change is a change in which no new substance is formed, and the substance retains its chemical identity. Melting ice is a physical change because solid water (ice) turns into liquid water, and the chemical composition (H₂O) remains the same.

A chemical change involves the formation of new substances with different chemical properties. Burning wood is a chemical change as wood (mainly cellulose) reacts with oxygen to form carbon dioxide, water vapor, and ash, which are new substances.

Answer:

Melting ice (other examples like freezing water, dissolving sugar in water, breaking a glass are also valid)

Question 25