Question

Why is combustion a chemical process?

Answer 1

Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). ... When organic molecules combust the reaction products are carbon dioxide and water (as well as heat).

Answer 2

burning of a substance in the presence of oxygen is known as combustion . It is a chemical process bcz in such a reaction the compostion of the substance changes .