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This is a series of lectures in videos covering Chemistry topics taught in High Schools.

Chemistry Tutorial 9.03: Entropy, Enthalpy And Spontaneous Reactions
This video gives a non-mathematical explanation of spontaneous reactions involving entropy and enthalpy.
Enthalpy, Energy Diagrams, and Catalysts
Here is a bit of explanations about reaction enthalpies, energy diagrams for endothermic and exothermic reactions and how catalysts affect energy diagrams

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