Question

Define activation energy....​

Answer 1

Answer:

Activation energy :

The minimum energy required for the completion of any reaction is known

as activation energy.

Hope it helps you

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Answer 2

It is defined as the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.

It is denoted by Ea

and it is expressed (unit) in kJ/mol.

Activation energy is not similar for all reactions. Activation energy of a reaction can be shown as follows:

Here is drawing ⬆️⬆️⬆️⬆️⬆️⬆️

In simple words, Ea is the energy needed for collision to reactant for reaction.