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# 5_LectureWeb - Learning Objectives 1/22/08 You should: 1....

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Learning Objectives 1/22/08 You should: 1. know the characteristics of equilibrium states. 2. understand the relationship between the rates for forward and reverse reactions and equilibrium constants. 3. understand that the equilibrium condition for every reaction is specified by its unitless equilibrium constant K , which depends on T , but is independent of P , the composition of the reaction mixture, and other reactions. 4. know that the Gibbs free energy G represents the tendency to react and that a system will spontaneously minimize its free energy to reach equilibrium. (For spontaneous processes, D G < 0. For nonspontaneous processes, D G > 0. At equilibrium, D G = 0.) 5. understand the distinction between the equilibrium constant K and the reaction quo - tient Q . 6. know the relationship between the Gibbs free energy change D G and the reaction quotient Q and the connection to the equilibrium constant K . 7. be able to write an equilibrium constant expression for K = K c based on a balanced chemical equation. 8. know that pure solids, pure liquids, and solvents (in dilute solutions) do not appear explicitly in equilibrium expressions. 9. be able to explain what K indicates about the extent of reaction at equilibrium. 10. be prepared to use the reaction quotient Q to determine if a system is at equilibrium and if it isn’t, determine the direction in which the reaction must proceed to reach equilibrium. 11. know how K = K c is related to K P in reactions involving gases. 12. be able to apply Le Chatelier’s principle to predict how a system at dynamic equilib - rium will respond when the following stresses are applied: Ë addition or removal of reactants or products (changes in concentration) Ë change in pressure or volume Ë change in temperature 13. be able to use equilibrium concentrations or pressures of reactants and products to determine a value for K c or K P . 2 14. be prepared to use an equilibrium constant and equilibrium concentrations or pres - sures of reactants and/or products to find an unknown equilbrium concentration or pressure. 15. know the relationship between the equilibrium constant for a reaction and its reverse. 16. understand how multiplying all of the stoichiometric coefficients in a balanced chemical equation by a constant factor affects the equilibrium constant of the reaction. 17. be able to combine multiple chemical equations (with known equilibrium constants) to arrive at a new reaction and then use this result and the known equilibrium constants to find the equilibrium constants for the new reaction. 3

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## This note was uploaded on 03/19/2008 for the course CEM 142 taught by Professor A.pollock during the Spring '08 term at Michigan State University.

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5_LectureWeb - Learning Objectives 1/22/08 You should: 1....

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