UNIT 13 – EQUILIBRIUM

 

I.             Characteristics, Definitions

 

II.            Equilibrium Constant Expressions (Keq)

                A.            How to write equations from a given reaction
                B.            Solving Keq expressions given concentrations

                C.            What substances to include, omit

 

III.          Le Chatelier’s Principle
                A.            Definition
                B.            Predicting direction of equilibrium shift
                C.            Predicting changes in concentration due to equilibrium shift

                D.            Changes in Keq values

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North Carolina Essential Standards and Clarifying Objectives:

Chm. 3.1  Understand the factors affecting rate of reaction and chemical equilibrium.

            3.1.2  Explain the conditions of a system at equilibrium.

         Define chemical equilibrium for reversible reactions.

         Distinguish between equal rates and equal concentrations.

         Explain equilibrium expressions for a given reaction.

         Evaluate equilibrium constants as a measure of the extent that the reaction proceeds to completion.

            3.1.3  Infer the shift in equilibrium when a stress is applied to a chemical system (Le Chatelier’s Principle).

         Determine the effects of stresses on systems at equilibrium. (Adding/ removing a reactant or product; adding/removing heat; increasing/decreasing pressure)