Classify the following into solid, liquid and gas:

Coal, kerosene, wood, oxygen, sugar, blood, water vapour, milk, wax.

Give appropriate terms for the following:

(a) The change of a solid into liquid.

(b) The force of attraction between the molecules of matter.

(c) The particles of matter which may or may not have independent existence.

(d) The process due to which a solid directly changes into its vapours.

(e) The change of vapour into a liquid.

Define matter.

Differentiate between an atom and a molecule.