Thermochemistry is the study of the heat energy combine with chemical reactions and/or physical transformations. It is based on the first law of thermodynamics, a reaction may release or absorb energy, and a phase change may do the same, such as in melting and boiling. Its targets on these energy changes, particularly on the system's energy exchange with its surroundings. The energy changes in chemical reactions are generally due to the breaking up of existing bonds between the atoms and the formation of new bonds. Thus, thermochemistry provides important information regarding bond energies.


  • Enthalpy
  • Entropy
  • Specific heat
  • Thermochemical equation
  • Hess’s law
  • Gibbs free energy
  • Second law of thermodynamics
  • Conservation of energy

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