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Question:

The addition of a catalyst to a chemical reaction will have what effect?

A Increase the rate at which the reaction takes place.
Explaination

A catalyst, by definition, is an enzyme that helps decrease the energy necessary to begin a reaction. Consequently, the addition of a catalyst to a chemical reaction will increase the rate at which the reaction takes place. A reduction in the energy required to begin the reaction means that the reaction will take place more quickly.