Example image of eyePlorer eyePlorer map for 'Hess's law': Chemist Germain Henri Hess Physical chemistry Physician Russia Switzerland State function Enthalpy Chemical equation Endothermic Entropy Product (chemistry) Reagent Standard enthalpy change of formation Gibbs free energy Bordwell thermodynamic cycle Chemical equilibrium Reduction potential Thermochemistry Latimer diagram Helium hydride ion Born–Haber cycle First law of thermodynamics Science and technology in Switzerland Hess List of multiple discoveries