CHM2046 Chapter 17 Chemistry Notes

CHM2046 Chapter 17 Chemistry Notes - Chapter 17 Chemistry...

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Chapter 17 Chemistry Notes Equilibrium: The Extent of Chemical Reactions 1) The Equilibrium State and the Equilibrium Constant a) All reactions are reversible and reach a state of equilibrium b) When the system has reached equilibrium: reactant and product concentrations stop changing because the forward and reverse rates have become equal: rate fwd.= rate rev. c) There is no further net change because a change in one direction is balanced by a change in the other. d) Equilibrium constant: K= [NO2]^2/ [N2O4] (at equilibrium) i) Small K: If the reaction yields little product before reaching equilibrium, K is small. ii) Large K: very little reactant remaining once reaching equilibrium, goes to completion. iii) Intermediate K: Significant amounts of both reactant and product are present, K has an intermediate amount. 2) The Reaction Quotient and the Equilibrium Constant a) Law of chemical equilibrium or law of mass action- at a given temperature, a chemical system reaches a state in which a particular ratio of reactant and product concentrations has a constant value. (no mention of rates) b) Q= the reaction quotient based on the balanced equation. = [NO2]^2/[N2O4] c) At Equilibrium Q=K, monitoring Q tells us whether the system has reached equilibrium i) The initial concentration gives us the same ratio of equilibrium concentrations ii) The ratio of equilibrium concentrations is constant 3) Writing Q a) Product concentration terms multiplied together and divided by reactant
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This note was uploaded on 02/07/2011 for the course CHEM 2046 taught by Professor Gower during the Spring '10 term at University of Florida.

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CHM2046 Chapter 17 Chemistry Notes - Chapter 17 Chemistry...

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