Maxwell Boltzman Distribution and reactivity

1 / 8

# Maxwell Boltzman Distribution and reactivity - PowerPoint PPT Presentation

Maxwell Boltzman Distribution and reactivity. Describes the distribution of gas particles with different kinetic energies. . Not all gas particles will have the same amount of energy at the same temperature. Most probable energy. Average energy .

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about ' Maxwell Boltzman Distribution and reactivity' - mae

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Maxwell Boltzman Distribution and reactivity

Describes the distribution of gas particles with different kinetic energies.

Not all gas particles will have the same amount of energy at the same temperature.

Most probable energy

Average energy

NB as the curve is assymmetric the average > most probable.

Collision theory states that a reaction will occur if a collision has the correct orientation and an energy equal to or greater than the activation energy.
• The Maxwell-Boltzman distribution can be used to show the numbers of particles that meet this criterion.

Activation energy

Area under the curve to the RHS is the number of collisions that can result in a reaction.

298 K

498 K

698 K

Increasing the temperature flattens the curve and pushes it to the RHS, but the total area remains constant.

As temperature increases so does the probability of a collision with a higher energy.

0 oC

25 oC

100 oC

As temperature rises there are more collisions with an energy≥ the activation energy, hence rate increases.

The Q10 Rule

A 100C rise in temperature results in a doubling of the metabolic rate.

Effect of decreasing activation energy.

If activation energy is lowered the area under the curve to the RHS of the activation energy increases.

There will be more collisions with an energy ≥ activation energy, so the rate increases.

Catalysed activation energy

Uncatalysed activation energy