The Reactant reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Reactant

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 productss. 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.

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