Question

If a substance reacts with oxygen, the chemical reaction is most likely a

Answer 1

If a substance reacts with oxygen, the chemical reaction is most likely a combustion reaction. Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Hope this answers the question.

Answer 2

Answer:

Combustion

Explanation:

Any combustion reaction needs as reagent $O_{2}$ to be able to happen.

By definition a combustion is a chemical reaction that occurs between oxygen  ($O_{2}$)and an oxidizable material, an energy release occurs and usually manifests itself by flame.