Lecture 23: Diffusion: Fick's First Law and Steady-state Diffusion, Dependence of the Diffusion Coefficient on Temperature and on Atomic Arrangement

author: Donald R. Sadoway, Center for Future Civic Media, Massachusetts Institute of Technology, MIT
recorded by: Massachusetts Institute of Technology, MIT
published: Feb. 10, 2009,   recorded: November 2004,   views: 17982
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)

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"The specific chemical rate constant, k, is the proportionality. And, k can be influenced by temperature through this Arrhenius type relationship, which compares the exponential of the activation energy with the available thermal energy.

And, we saw that we can integrate that rate equation, and put the data to the test. If we have a first-order reaction, we should get a semi-log dependence. And, I think I've got that shown here. Here's the data that I showed you last day.

This is just a normal decrease in concentration with time, typical attenuation curve. If we put it to the first-order test, according to this relationship we should get a straight line with a slope of minus k..."

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Reviews and comments:

Comment1 Hayder Alrashid, February 27, 2009 at midnight:

Mnay thanks for these leactures , they are very useful and very intersiting , again many thanks

Comment2 Vincent Summers, January 11, 2010 at 5:40 p.m.:

Professor Donald Sadoway's lectures - all of them - are eloquently verbalized and offer a great density of information. Interestingly, they are simple to understand. He provides excellent examples, illustrations, and anecdotal information. He is so understandable I at times find myself anticipating where he is heading. It is true I am a degreed chemist, but much of what I am following in his lectures is new to me. It is clear Professor Sadoway is knowledgeable in his field and loves teaching. So many professors have little interest outside their research projects. How refreshing! The full "bevy" of stars in all areas!

Comment3 Dr. Omid Mirzaee, March 31, 2010 at 5:56 p.m.:

Thanks alot for these lectures. whould you mind leading me how to have these video files about diffusion?


Comment4 amit patil, February 17, 2011 at 5:30 p.m.:

prof.donald sadoway is simply great

Comment5 sanjiv kumar, April 10, 2015 at 10:01 a.m.:

great lectures very usefull

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