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eo Equilibrium is reached when the rate of the forward reaction equals the rate of the reverse reaction. Notes: Equilibrium and LeChatelier’s Principle , Keed Wav bur fn Class: Remember, equilibrium does NOT mean equal. Physical equilibrium ex: Analogy Football field Constant P, T, #moles(fans) xty =— xy Vapor — Liquid + Heat Energy Seated = 19,500 fans | P| 50 yard line Concession Stand = 500 fans If, stress is applied to a system at equilibrium, the system will respond in a way that partially undoes the stress applied. Stresses to a chemical reaction could include: ‘Addition f aliqui ; © Increases or decreases in temperature Increase Pressure (Decrease Volume) - For gases, shift to the side with the fewer number of moles 3 Catalyst have no net effect on equilibrium, you just get to equilibrium faster. — ooa Lever system Used to understand changes in temperature and concentrations for chemical equations based on LeChatelier's principle. + Arrow up = increase Arrow down = decrease i di is i: vi Example #1: A closed system of ice and water at equilibrium. Stress: Increase Temperature. Ice + Energy «> Water @” equilibrium of the system shifts to the ® to use up the added energy. ‘Once a new equilibrium is established, the concentration of the water will increase. 
