Question

Why do you only need a small amount of catalyst?​

Answer 1

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A catalyst is a substance which changes the rate of reaction but is unchanged at the end of the reaction. Only a very small amount of catalyst is needed to increase the rate of reaction between large amounts of reactants.

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Answer 2

Explanation:

The regenerated catalyst can then be used to catalyze another like reaction. Thus, in principle, only a very small amount of catalyst is needed to generate copious amounts of product. This is desirable, as many catalysts that are used industrially are very expensive.

A catalyst is a substance which changes the rate of reaction but is unchanged at the end of the reaction. Only a very small amount of catalyst is needed to increase the rate of reaction between large amounts of reactants.