1. Reaction Rates Reaction Rates Collision Theory
5 Factors Affecting Rates

2. A. Rates
Rate:
measure of change over time

3. reactants  products A. Rates Reaction Rate:
rate at which reactants change into products over time.
(tell how fast a reaction is going)
Example: TNT & rusting
reactants  products
get consumed
get formed

4. A. Rates
more reactants
more products
reactants
products

5. B. Collision Theory
Ineffective Collision
Effective Collision

6. Activation Energy (Eact) B. Collision Theory For reaction to occur:
reactants must collide
with proper orientation
with enough energy
needed to react called
Activation Energy
(Eact)

7. Reactants energy energy released (in bonds) Product Potential
Reaction progress →

8. ? Reactants energy energy released (in bonds) Product Potential
Reaction progress →

9. B. Collision Theory
break reactant bonds
Eact ΔE

10. C. 5 Factors Affecting Rates
The speed that a reaction takes place can be affected by:
Temperature
Surface Area
Stirring
Concentration
Catalysts

11. 1) Temperature Temp. Rate Why does milk last l0nger in the fridge?
more energy
more collisions
Direct or inversely proportional

12. 2) Surface Area
Surf. Area Rate
more collisions

13. 3) Stirring
Stirring Rate
more collisions

14. 4) Concentration
Conc Rate
more collisions

15. 4) Concentration
Conc Rate
more collisions

16. 5) Catalysts speed up a reaction without being consumed.
lower the activation energy (Ea).
Like a party helps people meet each other and helps build friendships

17. Like a party helps people meet each other and helps build friendships

18. Why is H2O2 stored in dark plastic bottles?
5) Catalysts
Demo:
catalyst written above arrow
MnO2
2 H2O2  2 H2O + O2
DEMO (Genie in a Bottle): 40 mL 30% H2O2 in 250 mL Florence flask.
1 tsp of MnO2 in tissue on string with cork stopper holding hanging.
Why is H2O2 stored in dark plastic bottles?

19. Quick Quiz!
1) An increase in which one of the following will NOT increase the reaction rate?
A) temperature
B) concentration of reactants
C) total mass of reactants
D) surface area of reactants

20. Quick Quiz. 2) A catalyst speeds up a reaction by
A) lowering the activation energy.
B) increasing the temperature
C) permanently changing in a reaction
D) supplying energy to a reaction