So then should the reaction rate. The figure above shows the importance of molecular orientation in an effective collision. Only one of the five orientations shown for the collision between NO and NO 3 leads to product. In the effective orientation, those atoms collide that will become bonded in the product. The A factor is equal to the high temperature limiting rate constant for the reaction.
Catalysts can greatly influence the energy of activation.
They change the nature of the activated complex. Enzymes are great catalysts because they can increase the A factore and decrease the energy of activation at the same time, both increasing the reaction rate without increasing the temperature.