How can you tell if a reaction is combustable or not?

Combustion is an exothermic reaction, generally categorized by the release of energy through heat or light.

A combustion reaction must occur between oxygen and a fuel. The products vary from incomplete to complete combustion. Incomplete combustion occurs under the lack of oxygen, which complete combustion occurs under excess oxygen.

As long as reaction contains a fuel and oxygen, plus the need to heat, it should be a combustion reaction. The common products formed are CO2 and H2O.