1. Kinetic Theory
All matter is made up of very small particles that
are in constant motion
Particles (gaseous) are in continual rapid motion
Many collisions occur

2. Collision Theory
The more collisions
The faster the reaction
WHY???

3. However…
Collisions
Successful Unsuccessful
or or
Effective Ineffective

4. Continued..
Why must there be successful collision
between reactant molecules or atoms?
Collision Theory says…
 The formation of bonds requires atoms
to come close to one another.
 New bonds can form only if the atoms
are close enough together to share
electrons.

5. Continued..
 An effective (successful) collision must
happen with a
 great enough speed
 energy
 force
So, the colliding particles need a minimum
amount of energy

6. Continued..
 An effective (successful) collision must
happen with a
 great enough speed
 energy
 force
So, the colliding particles need a minimum
amount of energy