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Bimolecular reactions (e.g. A + B => C) generally occur at much slower rates than one would predict from the rate of collision between molecules as calculated from the gas kinetic theory. The discrepancy can be explained in terms of (A) intermolecular repulsions. (B) nonspherical molecular shapes. (C) erroneous estimates of molecular size. (D) activation energies of reaction. (E) the uncertainty principle.