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Lecture notes for Monday, Nov 26 for Exam V
Dr. Johnson CHEM135
AcidBase Equilibrium
Chemical Kinetics
Quiz 10 given and lecture evaluation forms completed by class
Please remember to also complete the electronic evaluation forms at:
www.courseEvalUM.umd.edu
Overall reaction:
A
products
Rate expression:
Rate =  ∆[A]/∆t
Rate Law: (instantaneous rate initially; based on initial [A] where x is the
order of reaction with respect to A and the overall order of reaction.
Rate = k[A]
x
Zero order reaction x=0
Rate = k[A]
o
= k
First order reaction x=1; rate is directly proportional to the [A]
Rate = k[A]
Integrated Rate Law:
relates time and the change in [A]
For first order reaction:
Set the rate expression and the rate law equal to each other; rearrange and
integrate.
You are not responsible to know this process; just the end result
which is:
ln [A]
t
– ln [A]
o
=
 k t
this can be rearranged into the equation for a straight line:
y
=
mx
+
b
ln [A]
t
=
( k )t – ln [A]
o
A plot of
ln [A]
t
vs
t(s) gives a straight line with a slope of –k
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View Full Document kt
A
A
o
t

=
]
[
]
[
ln
This is the integrated rate law for a first order reaction.
You will be only required to know the integrated rate law for a
first order reaction for this course
;
the integrated rate laws for other reaction orders are different:
KINETICS OF FIRST ORDER AND SECOND ORDER
REACTIONS
TYPE:
A
→
products
or
2A →
products
Order
Rate Law
Concentration
Time Equation
Half life
1
[A]
k
rate
=
units of k are
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This note was uploaded on 04/07/2008 for the course CHEM 135 taught by Professor Brooks during the Fall '08 term at Maryland.
 Fall '08
 Brooks
 Chemistry, Equilibrium, Electron, Kinetics

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