Burning of a candle is a chemical change whereas the melting of a candle is a physical change. Why?

The phenomenon which burning of candle belongs to both physical and chemical change. When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change. When the candle melts, no new substance is formed and the molten wax can be again solidified and made into a candle and it is a reversible change. So can be said that the change is physical.

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