Energy Profile Diagrams:
To show the activation energy of a reaction, energy profile diagrams are used. This diagram is a way of representing the energy changes that occur during a chemical reaction. The energy difference between the products and reactants represents the enthalpy change of the reaction. So, an energy profile diagram shows the activation energy required and the enthalpy change for a reaction.
The energy profile diagram for an exothermic reaction would be:
The energy profile diagram for an endothermic reaction would be: