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In a chemical reaction, what is the role of the limiting reagent?


It is the reactant that is left over after the reaction is complete.

It is the substance that acts as a catalyst to speed up the reaction.

It is the reactant that is completely consumed and determines the maximum amount of product.

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Answered by GPT-5 mini AI
Correct answer: "It is the reactant that is completely consumed and determines the maximum amount of product."

Explanation: the limiting reagent is used up first, so the reaction stops when it is gone; it therefore controls the theoretical yield. The reactant left over is the excess reagent, and a catalyst is not consumed (or not in limiting role) and only speeds up the reaction.