Question

Classify the following as chemical or physical changes:
*cutting of trees.
*melting of butter in a pan.
*rusting of almirah.
*boiling of water to form steam.
*passing of electric current through water and the water breaking down into hydrogen and oxygen gases.
*dissolving common salt in water.
*making a fruit salad with raw fruits.
*burning of paper and wood.

Answer 1

1. Cutting of trees: Physical change.

2. Melting of butter in a pan: Physical change.

3. Rusting of almirah: chemical change.

4. Boiling of water to form steam: physical change.

5. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases: chemical change.

6. Dissolving common salt in water: physical change.

7. Making a fruit salad with raw fruits: physical change.

8. Burning of paper and wood: chemical change.