Explain the following, giving examples.

(a) Saturated solution

(b) Pure substance

(c) Colloid

(d) Suspension

Classify each of the following as a homogeneous or heterogeneous mixture.

Soda water, wood, air, soil, vinegar, and filtered tea.

Which of the following materials fall into the category of 'pure substance'?

(a) Ice

(b) Milk

(c) Iron

(d) Hydrochloric acid

(e) Calcium oxide

(f) Mercury

(g) Brick

(e) Wood

(f) Air

Identify the solutions among the following mixtures.

(a) Soil

(b) Sea water

(c) Air

(d) Coal

(e) Soda water