Question

why does some substance burn with flame some do not?​

Answer 1

Answer:

Substances like camphor, candles, etc., burn with flame while substances like coal do not produce flame on burning. Substances when burn produce heat and light. ... As these substances heat up, like candles, the rising C-atoms produce light. Heat produces light, which is known as incandescence.

Answer 2

Answer:

because some contain highly reactive elements like oxygen and hydrogen wile some contain non flammable substance like nitrogen