When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of familiar process in which both the chemical and physical changes take place.

Academic Physics NCERT Class 7

When a candle melts, it converts to liquid form. It is a physical change. While burning it produces carbon dioxide, heat, and light. It is an irreversible change. Hence it is also a chemical change. This kind of chemical and physical changes are also occurring in liquefied petroleum gas which contains butane.

When we burn LPG, the liquid form is converted into a gaseous state, which is a physical change. The burning of LPG is a chemical change since it can't be reversed.

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Updated on: 10-Oct-2022

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