• A thermodynamically favored reaction does not always occur or may occur at extremely slow rates ○ System is described as being under “kinetic control”

                 ■ Often due to a high activation energy

  • Note: adding a catalyst has not effect on the values of ΔH° or ΔS°, so it cannot affect ΔG°
  • 2nd Note: so if question asks why a thermodynamically reaction won’t occur at a certain temp, it’s b/c the reactant molecules don’t have the sufficient avg KE to overcome the activation energy