What are the two primary products of complete combustion?

The two primary products of complete combustion are carbon dioxide (CO2) and water (H2O). In a complete combustion process, a fuel—typically a hydrocarbon—reacts fully with oxygen. This reaction is characterized by the fuel being broken down in such a way that all carbon atoms in the fuel convert to carbon dioxide and all hydrogen atoms convert to water.

During this reaction, sufficient oxygen must be present, allowing for complete oxidation of the fuel. This is contrasted with incomplete combustion, which occurs when there is insufficient oxygen, leading to the formation of carbon monoxide (CO) and other byproducts. The formation of CO and O, or other compounds, indicates that the combustion process did not fully utilize the fuel as effectively as complete combustion would.

In the context of the other provided options, they include either incomplete combustion products or mixtures that do not represent the end products of a combustion reaction. Thus, carbon dioxide and water are the definitive products of complete combustion, highlighting the efficiency and cleanliness of the process when sufficient oxygen is supplied.