Question

Give one example for each of the following types of changes:
(a) physical changes.
(b) chemical changes
(c) reversible changes
(d) irreversible changes

Answer 1

(a) Physical changes:
Example: Change in the size of the pencil or eraser with continuous use.
(b) Chemical changes:
Example: Burning of wood.
(c) Reversible changes:
Example: Salt dissolving in water.
(d) Irreversible changes:
Example: Curdling of milk.