AP Chemistry Unit 9.4 Thermodynamic and Kinetic Control AP PhysicsAP CalculusAP ChemistryAP Biology AP Chemistry-Concise Summary Notes- All Topics Thermodynamic and Kinetic Control A thermodynamically favored reaction does not always occur or may occur at extremely slow ratesDescribed as under “kinetic control”Often due to a high activation energyNote: adding a catalyst has not effect on the values of ΔH° or ΔS°, so it cannot affect ΔG° of the thermodynamics of a reaction