Define 1. Rate of reaction2. http://www.youtube.com/watch?v= 085e-ALKmUM&feature=related
Aims• Collision theory.• State Maxwell Boltzmandistrubution and how factors affect it.• Review exam style questions.
Collision Theory• reaction rate depends on: – collision frequency – number of particles with E ≥ Ea – appropriate collision geometry or orientation.
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.
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 !
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.
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