The Introduction to Thermochemistry

Thermo chemistry is the study of the energy and associated with chemical reaction and/or physical transformation. A reaction may release or absorb energy, and a phase change may do the same, such as in melting and boiling. Thermo chemistry focuses on these energy change, particularly on the system's energy exchange with its surroundings. Thermo chemistry 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, favourable or unfavourable. Endothermic reactions absorb heat. Exothermic reactions release heat. Thermo chemistry coalesces the concepts of thermodynamics with the concept of energy in the form of chemical bonds. The subject commonly includes calculations of such quantities as heat capacity, heat of combustion, heat of formation, enthalpy, entropy, free energy, and calories.