Question

Your teacher lights a small candle and allows it to burn. At first, the candle wax melts, but then it seems to burn away and disappear. The candle also gives off smoke, heat, and light. Is this a physical or a chemical change? Explain.

Answer 1

Burning of the candle is both physical and chemical change.burning of the candle causes the candle to melt the wax.so the wax has changed it was solid now it is liquid.the wax combines with the atmospheric oxygen and changes to carbon dioxide,heat and light.thus both the changes are accompanied by the burning of the candle.

Answer 2

A chemical change because the candle is burning and giving off heat. Once you burn a candle you can’t reverse it, which makes it a chemical change.