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# What is activation energy?A.It is the minimum amount of energy it takes to start a chemical reaction. B.It is the maximum amount of energy it takes to start a chemical reaction. C.It is the intermediate compound in a chemical reaction.D.It is the energy needed for an exothermic reaction.E.It is the energy needed for an endothermic reaction.

Last updated date: 24th Jun 2024
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Hint: Activation energy is the energy that must be provided to compounds to result in a chemical reaction. The activation energy of a reaction is measured in joules per mole, kilojoules per mole, or kilocalories per mole.

Complete step by step solution:
Activation energy, in chemistry, is the minimum amount of energy which is required to activate atoms or molecules to such a condition in which they can undergo a chemical transformation or change or physical transport or movement. In transition-state theory, the activation energy is the difference in energy content between atoms or molecules which are in an activated or transition-state configuration and their corresponding atoms and molecules which are in their initial configuration. The activation energy is usually represented by the symbol ${E_a}$.
In mathematical expressions for such quantities as the reaction the rate constant is:
$k$= $A\exp ( - {E_a}/RT)$
and the diffusion coefficient,
$D$=${D_o}\exp ( - {E_a}/RT)$
Activation energies are resolved or calculated from trial rate constants or dissemination coefficients which are estimated at various temperatures.

So the correct answer is A.