Transition State Theory — The Eyring Equation

Physical chemistry connects thermodynamics, kinetics and quantum mechanics through a single idea: a reaction's rate is set by how easily a molecular ensemble crosses the energy barrier between reactants and products. This simulator renders that barrier as a real 3D reaction-coordinate landscape and animates an ensemble of particles attempting to cross it, with the crossing probability driven directly by the Eyring equation, k = (k_B·T/h)·exp(−ΔG‡/RT). Independent sliders for activation enthalpy ΔH‡, activation entropy ΔS‡ and temperature T update the computed ΔG‡, the rate constant k and the reaction half-life live, while the particle ensemble visibly speeds up or grinds to a halt as you move them — turning an abstract thermodynamic cycle into something you can watch happen.