This webpage provides information (including diagrams) on enthalpy change. If you explore this website further, there are also practice questions and examples.
Enthalpy Change
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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.
Thermodynamics of Chemical Equilibrium
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This website gives useful information about how to read energy diagrams and what it means.
energydiagram
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