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Thermochemistry is the study of heat energy associated with chemical reactions and phase changes.
Thermochemistry involves the following concepts: Heat of reaction: Also known as the enthalpy of reaction, this looks at the overall heat energy that occurs in a reaction. Enthalpy: The heat content of a system. Hess's law: A principle in general chemistry that states that the change in enthalpy for a reaction is independent of path and depends only on initial and final states. Closed system: A thermodynamic system that exchanges neither energy nor matter with its surroundings. A covered pot on the stove is approximately a closed system.
Thermochemical reactions can be either endothermic or exothermic: Endothermic reactions: Absorb heat energy. Exothermic reactions: Evolve heat energy. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants.
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