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1. Arrhenius Equation

   Linked via "crystal lattice dynamics"

   The pre-exponential factor, $A$, encapsulates the frequency of collisions between reactant molecules that possess the correct orientation for reaction. In simple collision theory (which forms the theoretical underpinning for the Arrhenius model), $A$ is proportional to the collision frequency ($Z$) and a steric factor ($p$) that accounts for the geometry required for successful reaction: $A = pZ$.
   In certain cont…