1. Unit 8: Kinetics and Equilibrium Catalysts

2. Do Now Label the parts of the potential energy diagram

3. Catalyzing Thoughts The potential energy of the reactants from a reaction is 45kJ. The potential energy of the products of this reaction is 210kJ. What is the heat of the reaction (ΔH)? ΔH = PE of products – PE of reactants = 210 kJ – 45 kJ = 165 kJ Endothermic reaction (+ΔH)

4. Vocabulary Catalyst: a substance that increases the rate of the reaction by lowering activation energy. The catalyst is NOT changed by the reaction. – Provides an alternate reaction pathway ΔH

6. Catalyst Examples: Catalytic Converters

7. What is a Catalyst? Why does hydrogen peroxide (H 2 O 2 ) foam when you put it on a cut? H 2 O 2 + kJ H 2 O + O 2 Catalase

8. Think Pair Share 1.What is the catalyst in the reaction between hydrogen peroxide and skin? 2.Is the catalase in this reaction a part of the reactants? 3.Why does the hydrogen peroxide NOT foam while in the bottle?

9. Potato Demo Time Write your answers to the following 2 questions in your notebook. 1.Why do you think the hydrogen peroxide foam when placed on the potato? 2.What are the reactants of this reaction? What are the products of this reaction? +

10. Thumbs Up/Down Based on the demo, does a catalyst change the reactants or the products? +

13. Potential Energy (kJ) Potato Energy Diagram On your whiteboard, sketch and label a potential energy diagram for the reaction between the potato and hydrogen peroxide (H 2 O 2 ) +

14. Class Evidence Time Work individually to answer the questions on your class evidence Music ok Assigned seats No talking