Question

In order for a reaction to be classified as combustion, one of the reactants must be .

Answer 1

In order for a reaction to be classified as combustion, one of the reactants must be a **fuel**, typically a hydrocarbon (such as methane, propane, or gasoline), and the other reactant must be **oxygen** (O₂). During combustion, the fuel reacts with oxygen to produce carbon dioxide (CO₂), water (H₂O), and energy, usually in the form of heat and light.