1. Rates of Reactions Mr. Skirbst Physical Science Topic 18

2. Rates of Reactions Collision Theory

3. Rates of Reactions Collision Theory Rate (speed) of reaction determined by molecular collisions

4. Factors Affecting Rate 1- Concentration

5. Factors Affecting Rate 1- Concentration amount of substance in a given volume

6. Factors Affecting Rate 2- Surface Area

7. Factors Affecting Rate 2- Surface Area amount of substance that is exposed (outside surface)

8. Factors Affecting Rate 3- Temperature

9. Factors Affecting Rate 3- Temperature a measure of a particle’s energy of motion

10. Factors Affecting Rate 4- Catalysts

11. Factors Affecting Rate 4- Catalysts substance(s) that change the rate of reaction, but are not changed themselves

12. Energy of Reactions

13. Based on the type of energy change taking place

14. Energy of Reactions 1- Exothermic

15. Energy of Reactions 1- Exothermic - (heat) energy released out of a chemical reaction - (ex. Lighting match, explosion)

16. Energy of Reactions 2- Endothermic

17. Energy of Reactions 2- Endothermic - (heat) energy absorbed into a reaction - ex. Baking, ice pack

18. Energy of Reactions DATA TABLE: Beaker A: H 2 O (initial temp) A: H 2 O + CaCl 2 (final temp) A: H 2 O + CaCl 2 (change in temp) Beaker B: H 2 O (initial temp) B: H 2 O + NH(NO 3 ) (final temp) B: H 2 O + NH(NO 3 ) (change in temp)

19. Energy of Reactions GRAPH Time (sec) Temp. ( o C)

20. Rate of Reactions GRAPH Time (sec) Concentration (ml