Reactant
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In chemistry, the reactants are the substances that exist at the start of a chemical reaction. During the course of a reaction, the reactants form one or more products. In a chemical equation, the reactant is placed to the left of the arrow:
Reactant(s) → Product(s)
Limiting reactant
A limiting reactant is a chemical that stoichiometrically limits the amount of products that can be formed.