Question

Sofiya was doubtful when she heard Rakhi say that burning a candle is a combination of chemical and physical changes.


What explanation would you give for clearing Sofiya's
doubt?

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Answer 1

Answer:

If the wax was simply undergoing physical change, would you expect the candle to produce heat and light as it does when a candle burns? The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change.

Explanation:

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Answer 2

The following explanation will clear Sofiya's doubt -

• The burning of a candle is a combination of physical change and chemical change.
• Physical change: Some amount of wax of the candle is melted during the burning of a candle. This melted wax is further cooled down and again becomes solid wax-like before. This whole thing is considered a physical change.
• Chemical change: Burning of a candle mandatorily causes combustion (in presence of atmospheric oxygen). This combustion produces carbon dioxide gas, heat energy, light, etc. This whole thing is considered a chemical change.
• So, it is completely clear that when a candle burns, both chemical and physical changes take place.