Transcript LeChatelierEquilibrium2.pptx

Le Chatelier Equilibrium
There is a stress or a
disturbance to the
current equilibrium.
• Stresses can be:
• 1 – Extra or Removed Reactant or Product
• 2 – Extra or Removed Temperature/Heat
• 3 – Extra or Removed Pressure
The system can provide
relief and fix itself by
temporarily adjusting
rxn rates to
compensate.
• There are only two possible responses:
• 1 – Shift equilibrium to right / Favor forward rxn
• 2 – Shift equilibrium to left / Favor reverse rxn
There are consequences
to these responses that
change concentrations
of both reactants and
products.
• There are two sets of consequences:
• 1 - If shifts right… the concentration of anything
on left decreases and anything on right
increases.
• 2 - If shifts left… the concentration of anything
on the right decreases and anything on the left
increases.
A(g) + 2B(s) + heat <---- > 2C(g)
Stress
Increased [A]
Increased [B]
Response/Relief
Shift Right
Shifts Right
Favors Forward Rxn
Favors Forward Rxn
Consequence(s) / “As a Result”
[C] Increases
[C] Increases
[[B] Decreases
[A] Decreases
A(g) + 2B(s) + heat <---- > 2C(g)
Stress
Decreased [A]
Decreased [B]
Response/Relief
Shift Left
Shifts Left
Favors Reverse Rxn
Favors Reverse Rxn
Consequence(s) / “As a Result”
[C] Decreases
[C] Decreases
[B] Increases
[A] Increases
A(g) + 2B(s) + heat <---- > 2C(g)
Stress
Increased [C]
Decreased [C]
Response/Relief
Shift Left
Shifts Right
Favors Reverse Rxn
Favors Forward Rxn
Consequence(s) / “As a Result”
[A] and [B] Increase
[A] and [B] Decrease
A(g) + 2B(s) + heat <---- > 2C(g)
Stress
Increased Pressure
Decreased Pressure
Response/Relief
Shift Left
Shifts Right
Favors Reverse Rxn
Favors Forward Rxn
Consequence(s) / “As a Result”
[A] and [B] Increase
[A] and [B] Decrease
[C] Decreases
[C] Increases
A(g) + 2B(s) + heat <---- > 2C(g)
Stress
Increased Temperature
Decreased Temperature
Response/Relief
Shift to Right
Shift to Left
Favors Forward
Favors Reverse
Consequences/ “As a Result”
[A] and [B] Decrease
[A] and [B] Increase
[C] Increases
[C] Decreases
A(g) + 2B(s) <---- > 2C(g) + heat
Stress
Increased Temperature
Decreased Temperature
Response/Relief
Shift Left
Shifts Right
Favors Reverse
Favors Forward Rxn
Consequence(s) / “As a Result”
[C] Decreases
[C] Increases
[A] and [B] Increase
[A] and [B] Decrease
Work on practice problems using the following
format. Identify each and also explain why!!
Stress: ????
Response: ???
Consequences: ???