2. Factors Affecting RXN Rates Nature of Reactants Temperature Concentration Surface Area Catalysts/ Inhibitors

3. Catalyst Catalysts speed up reactions. (enzymes) Inhibitors slow down reactions (preservatives) Inhibitors

4. Catalyst / Inhibitors A substance NOT permanently changed during the reaction. Changes energy needed to start reaction

5. Catalytic converter Enzymes

6. Activation Energy Energy needed to start reaction

9. Energy Diagram

10. Heat of Reaction:  H Difference between the STORED Energy of the products and energy of the reactants  H = PEp - PEr productsreactants Change in heat

11. Endothermic reaction Energy is absorbed (in). Surroundings get colder E products > E reactants ▲H is positive

12. Products have more Energy

13. Exothermic Reaction Energy is released (out) surrounding get hotter E reactants > E products ▲H is negative

14. Products have less Energy

16. Catalyzed Reactions d9 c23

17. Hydrogen peroxide Rxt. C34

18. Catalyst Works by changing the activation energy required The lower the Ea the greater the rate of the reaction.

20. Inhibitors d9 c38 Works by changing the activation energy required The greater the Ea the lower the rate of the reaction.

21. Energy Diagram Inhibitors Ea