1. “Review” for Topic 5 and 6

2. Enthalpy level diagram

3. energy given out, ∆H is negative
activation energy
energy necessary to get the reaction going
REACTION CO-ORDINATE
ENTHALPY
energy given out, ∆H is negative
reactants
products

4. energy necessary to get the reaction going
activation energy
energy necessary to get the reaction going
REACTION CO-ORDINATE
ENTHALPY
Energy taken in and now stored in the bonds.
∆H is positive
products
reactants

6. Enthalpy level diagram

8. Increased Temperature
Maxwell-Boltzmann energy distribution curves
With a Catalyst

10. the reactant concentration changes with time in a typical chemical reaction

11. 2NO2(g)  2NO(g) + O2(g) product product reactant
the reactant and product concentration changes with time in a typical chemical reaction