Chapter 15 - Learning Goals

Write the equilibrium expression for a balanced chemical equation, whether heterogeneous or homogeneous.

Numerically evaluate Kc or Kp from a knowledge of the equilibrium concentrations or pressures of reactants and products or from the initial concentrations and the equilibrium concentration of at least one substance.

Interconvert Kp and Kc.

Calculate the reaction quotient Q, and by comparison with the value of K determine whether a reaction is at equilibrium. If it is not at equilibrium you should be able to predict in what direction it will shift to reach equilibrium.

Use the equilibrium constant to calculate equilibrium concentrations.

Explain how the relative equilibrium quantities of reactants and products are shifted by changes in temperature, pressure, or the concentrations of substances in the equilibrium reaction.

Explain how the change in equilibrium constant with change in temperature is related to the enthalpy change in the reaction.

Describe the effect of a catalyst on a system as it approaches equilibrium.