Final answer:
The statement is true as substances reacting with oxygen to produce carbon dioxide and water define a combustion reaction, commonly seen with hydrocarbons like methane.
Step-by-step explanation:
The question pertains to a combustion reaction where a substance reacts with oxygen gas, producing carbon dioxide and water. This process is a classic example of an oxidation reaction where the substance, often a hydrocarbon, is being oxidized. To illustrate with an example, for the combustion of methane (CH4), the chemical equation would be CH4 + 2O2 → CO2 + 2H2O. One mole of methane and 2 moles of oxygen react to yield 1 mole of carbon dioxide and 2 moles of water. The essence of this chemical process is found in the fact that all hydrocarbons, when combusted in the presence of enough oxygen, will produce carbon dioxide and water as their primary combustion products.