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.
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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