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Thermochemistry is the application of thermodynamics to the field of chemistry.
In general, thermodynamics deals with the interconversion of various kinds
of energy including heat and the corresponding changes in physical properties.
When applied to chemistry, thermodynamics can be used to predict the extent
to which chemical reactions proceed (see also chemical equilibrium).
More specifically, thermochemistry describes three major state functions in
a reaction: Entropy (S), Gibb's Free Energy (G) and Heat (H). Entropy is a
measure of disorder (and is constantly increasing in the universe), Heat is
a measure of the energy of the reaction (not necessarily temperature, which
is an average of molecular motion)and Gibb's Free Energy is a measure of
work that must go into a reaction to make it occur (when G is negative) or
work that a reaction can do (when positive).