Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.

What are the two types of pure substance ? Give one example of each type.

Which of the following are pure substances?

Milk, ice, air, iron, hydrochloric acid, wood, brick, mercury.

What is a mixture ? Give two examples.

Which of the following is a mixture?

air, water, sugar, salt, alum.

Is rain water or distilled water a pure substance?

Define elements. Give two examples.

Name the process $\mathrm{Z}$.