Lecture_32_112911 - Lecture 32: Chemical Equilibrium Goals:...

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Lecture 32: Chemical Equilibrium Goals: Use the concept of reversible reactions to explain chemical equilibrium. Calculate the equilibrium constant for a reversible reaction given the concentrations of reactants and products at equilibrium. Outline (Timberlake 9.2-9.4): ± Chemical Equilibrium (9.2) ± Equilibrium Constants (9.3) ± Using Equilibrium Constants (9.4) Problems for Extra Practice: 9.11, 9.13, 9.15, 9.17, 9.19, 9.21, 9.23, 9.25
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Reversible Reactions In a reversible reaction , there are both forward and reverse reactions. • Suppose SO 2 and O 2 are present initially. As they collide, the forward reaction begins. 2SO 2 ( g ) + O 2 ( g ) 2SO 3 ( g ) • As SO 3 molecules form, they also collide in the reverse reaction that forms reactants. This reversible reaction is written with a double arrow. forward 2SO 2 ( g ) + O 2 ( g ) 2SO 3 ( g ) reverse
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Chemical Equilibrium So far, we have assumed that a chemical reaction goes to completion as written. CO( g ) + H 2 O ( g ) CO 2 (g) + H 2 ( g ) In general, this is not correct. Instead, a stable state of the system in reached, which includes both reactants and products at constant concentrations. It is called the equilibrium state, or simply “equilibrium”. CO( g ) + H 2 O ( g ) CO 2 (g) + H 2 ( g )
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Chemical Equilibrium At equilibrium , • the rate of the forward reaction becomes equal to the rate of the reverse reaction • the forward and reverse reactions continue at equal rates in both directions
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Chemical Equilibrium (continued) When equilibrium is reached, • there is no further change in the amounts of reactant and product
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Equilibrium At equilibrium, • the forward reaction of N 2 and O 2 forms NO • the reverse reaction of 2NO forms N 2 and O 2 • the amounts of N 2 , O 2 , and NO remain constant N 2 ( g) + O 2 ( g) 2 NO( g)
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Equilibrium CO( g ) + H 2 O( g ) CO 2 ( g ) + H 2 ( g ) Initial After it stops changing
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_32_112911 - Lecture 32: Chemical Equilibrium Goals:...

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