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1. Reaction Kinetics

   Linked via "bimolecular encounters"

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   Here, $A$ is the pre-exponential factor (or frequency factor), $E_a$ is the activation energy, and $R$ is the ideal gas constant. The pre-exponential factor, $A$, is related to the frequency of collisions between reactant molecules that possess the correct spatial orientation for reaction. In viscous solutions, $A$ often includes a steric hindrance factor ($\rho$) derived from the princ…