Question

how can you say these are chemical changes? Give one reason for your answer.
(a) Burning of candle
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Answer 1

Burning of candle can both change physical and chemical

1] In case of burning of candle it is a chemical change because the wax burned can’t be reversed.

2] in case of melting wax it will be physical change because the wax melted down
Can be reversed if we freeze the melted wax and remake it again to a candle.

Hope it helps you [^-^]