Le Chatlier’s Principle
Subliminal message!

Chemistry is great!
Le Chatlier’s Principle
When an equilibrium is
disrupted, the reaction will
shift to restore equilibrium.
Subliminal message!

Chemistry is great!
Le Chatlier’s Principle
The equilibrium can be affected by:
- adding substances – the
reaction will shift away from the
change.
- removing substances – the
reaction will shift toward the
change.
Subliminal message!

Chemistry is great!
Le Chatlier’s Principle
- temperature – acts like a
reactant/product
- container size – smaller
container will shift toward small
number of molecules
- Adding inert gasses – no
effect
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
1) If pressure of A is increased
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
1)
If pressure of A is increased
Reaction will shift right
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
2)
The temperature of the reaction
is increased
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
The temperature of the reaction
is increased
Reaction will shift left
2)
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
A catalyst is added to the
system
3)
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
A catalyst is added to the
system
No change in the equilibrium
3)
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
More compound B is steadily
added to the reaction chamber
4)
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
4)
More compound B is steadily
added to the reaction chamber
The reaction will shift right
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
5)
An inhibitor is added
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
5)
An inhibitor is added
No shift in equilibrium
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
Argon gas is added to the
reaction chamber
6)
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
6)
Argon gas is added to the
reaction chamber
No shift in equilibrium
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
7)
The container is made smaller
Subliminal message!

Wednesdays and fridays at lunch in room
122
Le Chatlier’s Principle
For example: Consider the reaction
A+BC
H = -453 kJ/mol
7)
The container is made smaller
the reaction will shift right