Ques: Which compound used as matches in ancient Egypt?
Ans: small pieces of pinewood dipped in sulphur were used as matches in ancient Egypt.
Ques: What is the difference between the burning of a candle and the burning of a fuel like coal?
Ans: candle burns with a flame whereas coal does not.
Ques: The sun produces its own heat and light. Is it also some kind of combustion?
Ans: In the sun, heat and light are produced by nuclear reactions.