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 chemicals formed
b) Physical change.
Air can take down it's temperature and sink down.
c) Chemical change.
Heat is liberated and kerosene can't be recovered back.
d) Chemical change.
It is irreversible and some new product is formed.

Thanks.