1. Define
1. Rate of reaction
2. http://www.youtube.com/watch?v=
085e-ALKmUM&feature=related

2. Aims
• Collision theory.
• State Maxwell Boltzmandistrubution and how
factors affect it.
• Review exam style questions.

3. Collision Theory
• reaction rate depends on:
– collision frequency
– number of particles with E ≥ Ea
– appropriate collision geometry or orientation.

4. Collision Theory
• http://www.animatedscience.com.au/learning
modules/46.swf
• YIKES ! The last slide doesn’t work – you need
to fix this ! Please draw how
Temperature, Concentration, Pressure, Particle
Size and Catalyst alter rate of reaction.

5. Maxwell Boltzman Distribution

6. At a Higher Temperature..

7. Maxwell Boltzman with Catalyst

8. The Effect of a Catalyst
• A catalyst provides an alternative route for the
reaction with a lower activation energy. THE
ORIGINAL ACTIVATION ENERGY IS
UNCHANGED !

9. What is a Catalyst ?
• A catalyst is a tbsscanue which speeds up a
reaction, but isllyaccmiheunchanged at the
end of the rnciotea. When the reaction has
finished, you would havetelcaxythe same
mass of catalyst as you had at the beginning.

10. Graphs You Must be Able to Sketch
• 1. Vol of gas vs time
• 2. Mass vs time
• 3. Compare particle size on same graph
• 4. Compare T&P on same graph
• 5. Concentration of reactants and products vs
time
• 6. Rate vs time

11. Exam Style Questions
• Packs 

12. (Back up) Practical Techniques
• Describe a method to study the kinetics of the
traffic light reaction we did yesterday.
• (Use criteria sheet)