Textbook Chapters for Exam 2
All of Chapters 6 and 7 PLUS remember Chapter 10 sections 10 and 11. You’re responsible for any material covered in class
whether it was on the homework or not. This review sheet covers most everything we have done.
Also remember that no equa
tions are given on the exams. Values for equilibrium constants are given where needed although you should know
K
w
.
Chemical Equilibrium
• Know how to WRITE the
mass action expression
— same as
equilibrium equation
How does this expression change and the value of
K
when a
reaction is "flipped", doubled, halved?
When is this expression equal to
Q
? When is it equal to
K
?
• What is thermodynamic
K
? How does that relate to
K
p
and
K
c
?
• How does
K
p
relate to
K
c
?
When would they be equal?
• What is the relationship between
±
G
rxn
and
Q
?
(answer:
±
G
=
±
G
° +
RT
ln
Q
)
• What is the relationship between
±
G
0
rxn
and
K
?
(answer:
±
G
° = 
RT
ln
K )
This is the Chapter 10 stuff in sections 10 and 11 — you
might even have to back up a bit and reread section 9.
• What are the units for an equilibrium constant? There are NO
units. Why? Zumdahl refers to “apparent” units in places, I
prefer to stick with the “true” nounit version.
• Calculations involving the equilibrium constant,
K
• Know how to calculate the equilibrium constant if given equi
librium amounts of reactants and products. This is where you
are given the entire bottom row “e” (final equilibrium con
centrations) of the equilibrium table (ICE Table) that we use.
• Know how to calculate the equilibrium constant if given ini
tial concentrations and ONE
f
nal concentration at equilib
rium. This is where you are given only ONE of the bottom
row concentrations of your equilibrium table.
• Know how to calculate
f
nal (equilibrium) concentrations if
given initial concentrations and the value of
K
c
or
K
p
. This is
the typical type problem where you must set up and solve the
equilibrium expression for
x
. Your entire bottom row will be
lots of concentration formulas containing
x
.
• Know how to predict the direction of a reaction if given con
centrations and a value for
K
. (hint: compare
Q
to
K
)
• Know how to predict how equilibrium shifts (L, R, NC) when
a system is stressed. What are stresses? ANYTHING that
takes a system OUT of equilibrium. This are typically con
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 Spring '11
 Vanden Bout
 Equilibrium, pH, Dr. McCord CH302

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