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