1. Reaction Rate, Activation
Energy, and Catalysts
Kinetics- the study of how reaction rates change
Review of how reactions take place:
•
Bonds breaking requires energy
•
Bonds being formed releases
energy

2. Reaction Energy Profile
A
+
B
C
+
D
Reactants
Products
Measure the net energy change
E reaction
=
E products
-
E reactants
Exothermic Reaction

3. Types of Reactions
Endothermic reactions:
1. Bonds breaking- lots of energy
required and absorbed
2. Bonds forming- little energy
released
Exothermic reactions:
1. Bonds breaking- little energy
absorbed
2. Bonds forming- lots of energy
released

4. Endothermic Reaction Profile
Can you tell
the
difference?

5. Collision Theory
1. Formation of product
depends on effective
collisions.
2. These collisions are
affected by concentration,
surface area, pressure
(gases), temperature, and
presence of a catalyst.

6. Catalysts
Catalysts: Change the path of a reaction. They lower activation energy. They are not a part of
the products or reactants. They remain unchanged. Enzymes are catalysts.