Chemistry Regents Practice Test 2026 - Free Chemistry Regents Practice Questions and Study Guide

Question: 1 / 400

What type of chemical reaction does "combustion" refer to?

A reaction that absorbs moisture from the surroundings

A reaction that occurs when a substance reacts with water

A rapid reaction with oxygen that produces heat and light

Combustion refers to a chemical reaction that typically involves the rapid reaction of a substance with oxygen, resulting in the release of heat and light. This process generally occurs when fuels, such as hydrocarbons, react with oxygen, resulting in products such as carbon dioxide and water. The release of energy in the form of heat and light is what categorizes it distinctly as a combustion reaction.

In combustion reactions, the process is often characterized by visible flames and a significant increase in temperature, making it different from other types of reactions like those that absorb moisture or occur solely under specific pressure conditions. The key aspect of combustion is the presence of oxygen and the exothermic nature of the reaction, which provides the energy release that is commonly associated with burning.

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A reaction that occurs at high pressures only

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