Question

Give two reasons why melting of wax is considered a physical change while burning of a candle is a chemical change?​

Answer 1

Answer:

Melting of wax, wax can be molded again into a candle, no new substance formed. Thus, physical change.

Burning of candle, the Oxygen present in the atmosphere reacts is absorbed when in burning and produces carbon - dioxide, new substance formed. Thus, chemical change.