Determine the activation energy for the catalyzed reaction from the potential energy diagram below.

Question

1. 75 KJ
2. 25 KJ
3. 15 KJ
4. 10 KJ
5. 90 KJ

Answer 1

A catalyst increases the rate of reaction and it does so by lowering the activation energy, Ea. So, the dotted line is the energy diagram for the catalyzed reaction.

For the forward reaction, the reactants begin at an energy level of 65 kJ and the peak for energy needed is at 75 kJ.

So, the energy needed, or Ea = 75 - 65 = 10 kJ for the forward reaction. (ANSWER 4)