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Erudite1
In a chemical reaction, energy of activation refers to the minimum energy required to activate the atoms or molecules of compounds in order to bring about the occurrence of chemical reaction. In simple terms, activation energy is the energy that a set of reactants required that will enable them to undergo chemical reaction. The unit of activation energy is Joule. 
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ANSWER:

amount of energy available in a chemical system for a reaction to take place.

EXPLANATION:


Activation Energy. The term Activation Energy was presented in 1889 by Svante Arrhenius, a Swedish researcher. It is characterized as the slightest conceivable measure of vitality (least) which is required to begin a response or the measure of vitality accessible in a substance framework for a response to take place