Thermochemistry
Thermochemistry is the study of the heat energy related with chemical reactions and/or physical changes. A reaction may release or absorb energy, and a phase change may do the same, for example, in melting and boiling. Thermochemistry centers around these energy changes, particularly on the systems energy exchange with its surroundings. Thermochemistry is useful in predicting reactant and product quantities throughout the course of a given reaction. It is also used to predict whether a reaction is spontaneous or non-spontaneous, favorable or unfavorable in combination with entropy determinations. Endothermic reactions retain heat, while Exothermic reactions discharge heat. Thermochemistry mixes the concepts of thermodynamics with the concept of energy in as chemical bonds. The subject generally incorporates estimations of such quantities as heat capacity, heat of combustion, heat of formation, enthalpy, entropy, free energy, and calories.
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