Question

Joe watches a candle burn. What chemical change does he observe?

the heat melts the candle wax
heat and light are produced
the candle wax changes shape
the candle wax turns liquid as it burns

Answer 1

The most relevant chemical change that Joe observes when he watches a candle burn is that **heat and light are produced**. This occurs as the wax undergoes combustion, a chemical reaction with oxygen that releases energy in the form of heat and light. While the melting of the wax and the changing shape of the candle are physical changes, the production of heat and light indicates a chemical change.