1. Unit 1: Reaction Kinetics
Lesson 7: Activation Energies (Part II)

2. Mind-Blowing Moment!
5 min
All chemical reactions can proceed in two directions!
We write this as: Reactants Products

3. Activation Energies, Revisited
This means that there are two activation energy values for any given reaction:
Ea(f) = the activation energy for the forward reaction (reactants to products)
Ea(r) = the activation energy for the reverse reaction (products to reactants)
5 min

4. Brain Break!
5 min

5. Endothermic Reactions
Notes, then challenge students to draw the same diagram but for an exothermic reaction - 10 min
We can see from the diagram that Ea(f) = ΔH + Ea(r)

6. Exothermic Reactions
We can see from the diagram that Ea(f) = ΔH + Ea(r)
(this is the same as the equation for endothermic reactions)

7. Practice Time!
Pg. 25 #41-45
15 min