Which clue can be used to identify a chemical reaction as a combustion reaction?

Oxygen is a product.
A hydrocarbon reacts with oxygen.
Water and carbon dioxide react.
The reaction involves ions.

Question

Which clue can be used to identify a chemical reaction as a combustion reaction?

Oxygen is a product.
A hydrocarbon reacts with oxygen.
Water and carbon dioxide react.
The reaction involves ions.

JollyRanchers45 · Answer

The reactants and products determine the type of chemical reaction. If there are more products than reactants, then it is a decomposition reaction. If there are more reactants than products, it is a synthesis reaction. If oxygen is a part of the reactant, it is a combustion reaction.