Register to reply

Mean Free Path and Reactions (Atmospheric Chemistry)

by sidnake
Tags: atmospheric, chemistry, free, path, reactions
Share this thread:
sidnake
#1
Jan16-13, 07:07 AM
P: 4
Hi, I have an exam tomorrow for atmospheric chemistry and I was just going over some past papers. In one it asks the following question, "What is meant by "Mean Free Path"? How is this relevant to atmospheric chemistry.

My answer was as follows "The mean free path is the average distance a molecule travels before it undergoes collision with another molecule. Doubling the pressure, halfs the mean free path. This is relevant to atmospheric chemistry because the reduced pressure as altitude increases leads to an increased mean free path, which has an effect on the chemistry observed at different altitudes."

I was wondering what effect does the mean free path actually have on reactions present at different altitudes? I assume the higher the mean free path, the lower the reaction rate so at high altitudes only more reactive molecules will react? Anything else?

Thanks Alex
Phys.Org News Partner Chemistry news on Phys.org
Mineral magic? Common mineral capable of making and breaking bonds
Seeing is bead-lieving: Scientists create model 'bead-spring' chains with tunable properties
New molecule puts scientists a step closer to understanding hydrogen storage
Studiot
#2
Jan16-13, 12:54 PM
P: 5,462
Effect on chemistry?

Pressure of a gas is another word for concentration.

The rate of a chemical reaction depends upon the concentration of the participants so through your link to pressure is related to the mean free path.


Register to reply

Related Discussions
Chemistry rate reactions Biology, Chemistry & Other Homework 1
Free longitudinal atmospheric temperature data Earth 0
Me here atmospheric chemistry question -:-( got test tom Biology, Chemistry & Other Homework 0
Atmospheric chemistry - how to find a wavelength Biology, Chemistry & Other Homework 2
Atmospheric Chemistry, where to start? Biology, Chemistry & Other Homework 3