Enumerate any two differences between sample distillation and fractional distillation.

Which of the following are chemical changes and which physical? Give reason.

1. A glass bottle breaking.
2. Coal burning in air.
3. Making a cake.
4. Wool being knitted into a sweater.

Define dispersion medium.

Explain why, a solution of salt in water is considered a mixture and not a compound.

By which method of separation the volatile component from its non-volatile solute can be separated?

Define solubility of a substance. How does it vary with temperature?

Classify the following materials as homogeneous mixtures and heterogeneous mixtures: Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.

Define a compound. Give two points of evidence to show that sodium chloride is a compound.

Classify the following as physical or chemical properties: Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.

State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.