Advanced Placement (AP) Chemistry Practice Exam 2025 - Free AP Chemistry Practice Questions and Study Guide

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Which best describes a displacement reaction?

A reaction where two compounds exchange parts

A reaction where one element replaces another in a compound

A displacement reaction is best described as one where an element replaces another element within a compound. This type of reaction can typically be categorized into single and double displacement reactions. In a single displacement reaction, one element takes the place of another in a compound, leading to the formation of a new compound and the release of the replaced element. For example, in the reaction between zinc and hydrochloric acid, zinc displaces hydrogen from hydrochloric acid to form zinc chloride and hydrogen gas.

This definition aligns well with the characteristics of displacement reactions in general chemistry. Understanding this concept is crucial since it helps to predict the products of reactions when given the reactants.

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A reaction that involves the combustion of a substance

A reaction where elements combine to form a compound

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