Step-by-step explanation:
There are two types of change in matter: physical change and chemical change. A physical change affects a substance’s physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change.
The given changes are classified as follows:
The physical changes are:
(a) melting of sodium chloride.
(c) evaporation of alcohol.
(d) dissolving of sugar in water.
The chemical changes are:
(b) rusting of iron.
(e) decomposition of water.
(f) tarnishing of silver.
(g) non-reactivity of helium.