1) A catalyst is a substance that changes the rate of reaction but does not affect the rate of reaction but affect the rate of the products or the type of products formed.
2) A catalyst has the following characterics :
* Does not change the amount of products formed.
* It is unchanged chemically at the end of the reaction. ( The amount of the catalyst is the same beforew and after the reaction take place )
* It is specific. Different reactions require different catalyst.
* Only a small amount of catalyst needed to catalyse a reation.
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