05 Notes - Le Chatelier's Principle

05 Notes - Le Chatelier's Principle - Aim: W hat happens to...

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Aim: What happens to an equilibrium system when it is stressed? QQ: What does it mean to be in a state of “dynamic equilibrium?” Do Now: Once a reaction is in equilibrium, how can we force the forward or reverse reaction to keep occurring? Le Chatelier’s Principle: 1. A system at equilibrium will remain in equilibrium unless acted upon by an outside force. 2. The system will react to alleviate the stress placed upon it. Whatever you do to the system, it will try to undo it! How do we stress a system? o Temperature o Pressure o Concentration o Add an inert gas o Add a catalyst o Common ion effect We will usually be evaluating gaseous systems! Increasing Concentration 2 H 2 (g) + O 2 (g) 2 H 2 O (g) + heat What happens to the concentrations of each substance if… o H 2 is added? (forward reaction is favored) o O 2 is added? (forward reaction is favored) o H 2 O is added? (reverse reaction is favored)
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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05 Notes - Le Chatelier's Principle - Aim: W hat happens to...

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