Regents Chemistry Exam August 2022
45. Given the potential energy diagram for a reaction:
Which numbered interval represents the activation energy of the reaction?
(2) 2 (3) 3
Explanation: Activation energy is the energy needed for the reactants to be able to start the reaction and become products. Reactants are on the left side of the diagram before the hill, and products are to the right of the hill. The energy needed for reactants to reach the top of the hill is represented by 1.