CK-12 Foundation
Ck 12: Le Chatelier's Principle
[Free Registration/Login may be required to access all resource tools.] Students explain the factors that stress a system at equilibrium and use Le Chatelier's principle to predict how the system will respond to each stress. They will...
University of Waterloo (Canada)
University of Waterloo: Excess and Limiting Reagents
Very good site which gives an explanation, example and skill building questions over limiting reagents.
Shodor Education Foundation
Shodor: Equilibrium
A presentation of the basics of chemical equilibrium, covering equilibrium expressions, Le Chatelier's principle, and sample calculations.