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This webpage provides information (including diagrams) on enthalpy change. If you explore this website further, there are also practice questions and examples.

This web site covers the Gibbs Free energy equation. It goes into depth on both Enthalpy and Entropy. It also discusses how/why temperature has an effect on the free energy. There is a table at the begining of the site that helps you to choose the part of Thermodynamics you would like to explore.

This website gives useful information about how to read energy diagrams and what it means.