Differentiate between an atom and a molecule.

Define:

(a) Solid

(b) Liquid

(c) Gas

Give two examples of each type.

(a) Define interconversion of states of matter.

(b) Why do solids, liquids and gases differ in their physical state?

(c) Under what conditions do solids, liquids and gases change their state?

Give reasons:

When a stone is dipped in a glass containing some water, the level of water rises but when a spoon of sugar is added to it and stirred, the water level does not rise?