1. Summary

2. Collision Theory
• Reaction takes place when
particles collide.
Effective Collision
• Particles must collide with
sufficient energy for reactions
to occur

3. Collision Theory
• More frequent collisions => Faster reactions
• Particles collide with higher energy => Faster
reaction

4. Factors Affecting Speed
of Reaction
1) Concentration
High concentration
• Particles are closer together
• Hence, they collide more
frequently
• Faster reaction

5. Factors Affecting Speed
of Reaction
2) Pressure
Pressure is increased
• Particles are squeezed closer
together
• Hence, they collide more
frequently
• Faster Reaction

6. Factors Affecting Speed
of Reaction
3) Temperature
Temperature is increased
• Particles have more energy
• Move faster and hence collide
more frequently
• Faster Reaction

7. Factors Affecting Speed
of Reaction
3) Temperature
Temperature is increased
• Particles have more energy
• Move faster and hence collide
more frequently
• Faster Reaction