Question

Classify each of the following as a physical or chemical change. Give reasons.

a. Drying of a shirt in the sun.

b. Rising of hot air over a radiator.

c. Buring of kerosene in a lantern.

d. Change in the colour of black tea on adding lemon juice in it.

Answer 1

a physical change (no new substance is formed)

b physical change (no new substance is formed)

c chemical change( new substance is formed)

d Physical change (as there occurs only the dissolution)