Chemistry 008
Handout #6
Mrs. Harriet Smithline
Spring 2005
Chapter 14 Review Guide Lectures 2/15 and 2/17/05
Kinetics:Mechanisms and Rates of Reaction
I.
Rate Laws, Reaction Order, and Experimental Determination of a Rate Law 
A.
The differential form of the rate law (usually just called the rate law) relates
reaction rate to a
rate constant and the concentrations of reactants.
For the general reaction aA + bB
+ …
→
products
Relative rates =

1
∆
[A]
=

∆
[B]
=
….
The differential rate law is:
rate = k[A]
α
[B]
β
……
a
∆
tb
∆
t
where k is the rate constant, and
α
,
β
and … are found experimentally. The intent is to show that they
are different exponents and are not the same as the coefficients of the balanced reaction.
Note that for a given reaction, the rate constant, k, changes only with the temperature.
The units of k depend on the order of the reaction. To determine the values of
α
,
β
and … , consider the
power to which the change in concentrations must be raised in order to obtain the rate change. These
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 Spring '07
 DAVIS,F
 Chemistry, Kinetics, Chemical reaction, Rate equation, ﬁrst order reactions

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