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

Question: 1 / 400

What is a key feature of a double replacement reaction?

Two reactants create a new bond

Products are always gases

Reactants exchange ions to form new compounds

In a double replacement reaction, also known as a double displacement reaction, the key feature is that reactants exchange ions to form new compounds. This type of reaction typically involves two ionic compounds in solution that react, resulting in the formation of two new ionic compounds. The exchange of ions occurs when the ions from the reactants displace one another, leading to the formation of products that may include precipitates or gases, depending on the specific reaction conditions.

For example, if you mix solutions of silver nitrate and sodium chloride, the silver ions will exchange with the sodium ions, resulting in the formation of solid silver chloride and sodium nitrate in solution. This ion exchange is characteristic of double replacement reactions and distinguishes them from other types of reactions, such as synthesis or decomposition reactions, where the mechanisms differ significantly.

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It requires heat to occur

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