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Definition: If you apply a stress to an equilibrium problem, the system will try to get rid of that stress in order to go back to the original equilibrium.
Mr. McLeod addition to definition:
a. System can only overall make more reactant or more product
b. System will never get back to original equilibrium (since you add something in) but comes to a new equilibrium.
How you answer LeChatlier's Principle problems for Mr. McLeod ($ step method)
1. What is stress
2. Reduce stress by which causes making more reactant or product
3. Favors the forward or backward reaction (for change in temp must add endo or exo)
4. Shift equil to the Right or Left
For AP students (how actual amount of material change??):
Types of Stresses
a. Adding more reactant/products
b. Changing Temperature (really means increase Energy).
Example from class:
c. Pressure change (there are more than one way to do this)
d. Add a catalysts