AFOQT Practice Test

A combustion reaction is defined by its interaction with oxygen, leading to the release of energy, often in the form of heat and light. When a fuel reacts with oxygen, the typical products are carbon dioxide and water, particularly in complete combustion. This aligns perfectly with choice B, which accurately describes a combustion reaction as involving oxygen and resulting in energy release along with the production of carbon dioxide. The other options describe different types of reactions. For instance, the first option pertains more to sublimation, where a solid transitions directly to a gas without becoming a liquid. The third option refers to single displacement reactions, where one element substitutes another in a compound. Lastly, the fourth option describes decomposition reactions, where a single compound breaks down into simpler substances. Thus, understanding the specific characteristics of various chemical reactions clarifies why B is the most accurate description of a combustion reaction.