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  1. Reaction Kinetics

    Linked via "collisions"

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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…

  2. Reaction Kinetics

    Linked via "collisions"

    Collision Theory (CT)
    Collision Theory (CT) models reactions in the gas phase as the result of direct molecular collisions. It posits that the rate is proportional to the frequency of collisions and the fraction of those collisions possessing sufficient energy ($E_a$) and the correct orientation. The frequency of collisions ($\text{Z}$) can be calculated using [hard-sphere molecular models](/entries/h…