Question

Boojho wants to separate the following materials as combustible and non-combustible substances. Can you help him?
Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood, water. [3 marks]

Answer 1

The substances that burn or catch fire easily are called combustible substances whereas the substances that do not burn or catch fire easily are called non-combustible substances.

The substances given can be classified as combustible and non-combustible substances as follows:

• Combustible substances: Charcoal, straw, cardboard, paper, candle, and wood. [1.5 marks]
• Non-combustible substances: Chalk, stone, iron rod, copper coin, glass, and water [1.5 marks]