Identify A, B, C and D; first one is done for you.

Explain why:

(a) Boiled or distilled water tastes flat.

(b) Ice at zero degree centigrade has greater cooling effect than water at 0°C.

(c) Burns caused by steam are more severe than burns caused by boiling water.

(d) Rivers and lakes do not freeze easily?

(e) Air dissolved in water contains a higher proportion of oxygen.

(f) If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.

(g) Rain water does not leave behind concentric rings when boiled.

A solution contains 15 g of sodium chloride in 285 g of water. Calculate the concentration of the solution.

4 litres of an organic compound, acetone, is present in 90 litres of an aqueous solution. Calculate its volume percent.