This chapter develops the concept of equilibrium. Equilibrium is reached when the concentration of products and reactants remains constant. The concentrations of reactants and products at equilibrium are related by an equilibrium expression. The equilibrium constant, Keq, is a measure of whether the reaction favors the reactants or the products. Le Chatelier's principle can be used to predict changes in the equilibrium positions of reversible reactions.

In this chapter, you will learn: to describe a reversible reaction to define chemical equilibrium and explain how it is achieved to determine the equilibrium constant for a given reaction to analyze the extent of a reaction from its equilibrium constant to use the reaction quotient of a reaction to determine if the reaction is at equilibrium to explain Le Chatelier's principle to describe how changes in concentration, pressure, and temperature affect equilibrium to relate the Haber process to Le Chatelier's principle