B56: Chemical Reaction Kinetics


Introduction

The science of thermodynamics deals with chemical systems at equilibrium, which by definition means that their properties do not change with time. Chemical kinetics deals with changes in chemical properties in time. Consider the chemical reaction:

A + B -> C + D

reactants products


As with thermodynamics, chemical kinetics can be understood at several levels:

(1) qualitative description level: what products are obtained from what reactants under what conditions.

(2) the identification of elementary steps and transient intermediates in reaction mechanisms.

(3) the molecular reaction dynamics:

transport processes e.g. collisions, diffusion

reaction processes e.g. complex formation, interaction


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Reference: P.W. Atkins, Physical Chemistry, 2nd or later Editions.

Solved problem assigment questions (~3 per lecture).

1 Marked Assignment worth 10% set 1/3 way through course (lecture 3).

Exam worth 15%.


Main Headings

Collisions and Transport Theory (Chapters 25,26)

L1. Collisions: velocity distribution, collision frequency, mean free path

L2. Transport: flux, effusion, diffusion

Chemical Kinetics (Chapter 27)

L3. Empirical chemical kinetics: methods

L4. Rate laws and reaction order

L5. Elementary reactions: molecularity and T dependence

L6. Complex reactions

Reaction Dynamics (Chapter 28)

L7. Molecular reaction dynamics: Collision theory and diffusion control

L8. Molecular reaction dynamics: TST theory

L9. Molecular reaction dynamics: potential energy surfaces and the dynamics of molecular collisions


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Last revised Tuesday 27 May 1997 EST - Harold W. Schranz Email: Harold.Schranz@anu.edu.au