What is the term for the energy responsible for the variations in the reaction rates of chemical processes?

What is the term for the energy responsible for the variations in the reaction rates of chemical processes?
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It's hard to know precisely what is meant by this question. You may be thinking of activation energy, the minimum energy needed to start the reaction, which explains why one reaction may go at a different speed from another. On the other hand, if you are thinking of just one reaction going faster and slower depending on the energy supply, then that's most often thermal energy.
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