Is the melting of wax a physical or chemical change? from, Ask an Expert

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Is the melting of wax a physical or chemical change? from the mass measurement only,( the mass of the candle at 0 minute is 10.1g, after 30 minutes is 7.4g) how could a chemical also be proved to have occured in the burning of candle.( how does this all tie into the law of conservation of the mass?)

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