Chapter 16: Principles of Chemical Equilibrium

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Chapter Objectives


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  1. Describe the condition of equilibrium in a reversible reaction.

  2. Describe how equilibrium concentrations are established experimentally.

  3. Write the equilibrium constant expression in terms of concentrations, Kc for a reaction and use the value of Kc and the concentrations of all species but one to determine the equilibrium concentration of that species.

  4. Derive K values for situations where chemical equations are reversed, multiplied through by constant coefficients, or added together.

  5. Assess the relative importance of the forward and reverse reactions from the magnitude of an equilibrium constant.

  6. Write an equilibrium constant expression in terms of partial pressures of gases, Kp; and relate a value of Kp to the corresponding value of Kc.

  7. Know that the concentrations of pure liquids and solids are omitted from equilibrium constant expressions.

  8. Calculate a numerical value of an equilibrium constant if equilibrium conditions are given.

  9. Predict the direction in which a reaction proceeds toward equilibrium by comparing the reaction quotient, Qc to Kc.
  10. Use the ideal gas law and Dalton's law of partial pressures in working with Kp expressions.

  11. Make qualitative predictions of how equilibrium conditions change when an equilibrium mixture is disturbed. That is, apply Le Châtelier's principle.

  12. Calculate the final equilibrium condition in a reversible reaction from a given set of initial conditions.

  13. Calculate the new equilibrium concentrations or partial pressures after an equilibrium system has adapted to changed conditions.


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