(a) (i) Physical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.
(ii) Chemical change: A permanent change in which new substances are formed whose composition and properties are completely different from those of the original substances.
(b) Physical change:
(i) Change of water into its vapors.
(ii) Heating of iron rod.
Chemical change:
(i) Burning of wood.
(ii) Breathing.
