CH353
- Physical Chemistry I Spring 2015, Unique 51170 Lecture Summary, 30 April 2015 |

Fast Equilibrium: The
steady-state approximation is usually most useful for reactions in
which the first elementary step is the slowest (i.e. rate
determining). Sometimes that is not the case, and the
intermediate created in the first or first few elementary steps
builds up over time before it is consumed:[I] = K(c)[R]Both the SSA and FE assumptions allow us to solve for [I] in terms of [R] and/or [P], which in turn will solve for a rate law. This
rate law always must be compared to the experimentally observed
rate law to determine if it is correct. If not, then
one or more of our assumptions has been wrong, and we need to
rethink the problem. |