Give two examples of Combustible and Non-Combustible Substances. (b) Give reasons.
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combustible substances - petrol , coal
Petrol and coal burns in air producing carbon dioxide, heat and light. A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substances which undergo combustion are known as combustible substances.
non combustible substances - rock , sand
Rock and sand do not burn in air. so, they are non combustible
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