1. Chemical Reactions Energy and Reaction Rates

2.  Chemical reactions require energy to start  Activation Energy - Energy needed to start a chemical reaction  Endothermic reactions take in energy  Exothermic reactions give off energy Chemical Reactions

4. Activation Energy is represented by the top of the “hump” (E a )

5.  A catalyst is something that speeds up a chemical reaction by lowering the activation energy  An enzyme is a biological catalyst Chemical Reactions

6. Activation Energy is lowered when a catalyst is present Chemical Reactions

7.  Reversible Reaction – synthesis reactions that can be reversed to become decomposition reactions  Spectator Ions – Ions that remain aqueous throughout the chemical reaction  Net Ionic Equation – Substances that remain after the spectator ions have been removed. Chemical Reactions

8.  Reaction Rates – the time it takes for a chemical reaction to occur Reaction Rates

9.  4 Factors impact Reaction Rates 1. Concentration – the amount of material in a given amount of material Reaction Rates

10. Concentration

11. Reaction Rates  4 Factors impact Reaction Rates 2. Temperature – the measure of the average kinetic energy of molecules in a substance

12. Reaction Rates  4 Factors impact Reaction Rates 3.Surface Area Length x Width of all sides added together in a cube

13. Reaction Rates

14. What is the surface area of the cube?

15. Reaction Rates What is the surface area of the cube?

16. Reaction Rates

17. 1000 small cubes. What is the surface area? Reaction Rates

18. How many small cubes? What is the surface area of 1 small cube?

19. Reaction Rates How many small cubes? What is the surface area of 1 small cube?

20. 10 cm 600 cm 2 Surface area = 6 cm 2 Surface area = Reaction Rates

21. 10 cm 600 cm 2 Surface area = 6 cm 2 Surface area = Reaction Rates x 1000 = 6000 cm 2

22. Which would dissolve faster ? 600 cm 2 Surface area = 6 cm 2 Surface area = Reaction Rates x 1000 = 6000 cm 2

23. Reaction Rates  4 Factors impact Reaction Rates 4. Catalyst Speeds up chemical reaction by lowering the activation energy (does not get used up!!)