Topic 7 -Equilibrium
A little review
1.
Discuss the characteristics of a reaction in
dynamic equilibrium.
-How do the rates of the forward and reverse
reactions compare?
-How do the concentrations of reactants and
products compare?
2.
3.
4.
How is the equilibrium constant expression
determined?
Explain the effect of a change in
temperature on Kc.
Explain how adding a catalyst affects Kc.
Warm-up

Break to Richard Thornley….
Macroscopic/Atomic Properties?

Deduce the equilibrium constant
expression from the equation for a
homogenous reaction.
7.2.1

Deduce the extent of a reaction from the
magnitude of the equilibrium constant.
◦ Kc = ~ 1
◦ Kc >>1
◦ Kc <<1
7.2.2
For the following equation:
PCl5 (s)
PCl3(l) + Cl2(g) ΔH =
+88kJ/mol
Explain the effect of each of the following
changes on kc:
1. Increase in chlorine concentration
2. Increase in pressure
3. Increase in temperature
4. Addition of a catalyst
7.2.3

State and explain the effect of a catalyst
on an equilibrium reaction.
7.2.4

Apply the concepts of kinetics and
equilibrium to industrial processes.

You must know the Haber and Contact
Processes very well!
◦ Include conditions and uses of products
7.2.5