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Reactants

Written by the Fiveable Content Team โ€ข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated September 2025

Definition

Reactants are substances that start a chemical reaction. They interact with each other to form new substances called products.

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Reactants Definition - AP Chemistry Key Term | Fiveable