What is formed when a candle is burned?

Answer 1

That depends on what kind of candle. For traditional wax candles, it depends on what the wax is made from, as well as what the wick is made of, but generally speaking, what is formed when you burn these types of candles is CO2, as well as any impurities in the candle's wick, and whatever burns off from the candle's wax.

Believe it or not, candle wax isn't just there to hold the wick up. It's actually a major factor in the burning of the candle, as when it melts, the flame on the wick causes it to vaporize and burn, thus, whatever the wax is made from, whatever you get from a combustion reaction with oxygen and that substance, that's the rest of the product.