This module uses screencasts and an interactive simulation to explain how to do equilibrium calculations when one or more pure solid or pure liquid phases is involved in the equilibrium reaction. It then provides example problems to allow the user to test themselves. Your retention of material in this module will increase if you write down reasons for your answers to ConcepTests, questions in screencasts, and questions to answer before using the interactive simulation, and you try to solve the example problems before watching the solutions in the screencasts. We suggest using the learning resources in the following order:

1. Attempt to answer the multiple choice ConcepTest and solve the example problem before watching the screencasts or working with the simulations.
2. Watch the screencasts that describe heterogeneous chemical equilibrium and answer the questions within the screencasts.
3. Review important equations for heterogeneous chemical equilibrium.
4. Use the interactive simulation to further understand the behavior of heterogeneous chemical equilibrium.
5. Try to solve the example problems before watching the solutions in the screencasts.
6. Answer the ConcepTests.
7. Look at the list of key points, but only after you try to list the key points yourself.