To build on Richard Tolman’s interpretation of this quantity, which defines it as the difference between a letter with a double overbar and a letter with a single overbar, Donald Truhlar examined convex plots of a certain equation. This quantity is related to the enthalpy of reaction by the Evans–Polanyi principle. (15[1])This quantity increases as a result of having a lower ZPE when a reactant is deuterated. (-5[1])As this quantity increases, a reaction shifts from (*) kinetic control to thermodynamic control. The negative of this quantity over RT appears in the exponent (10[1])in the Arrhenius equation. On a reaction coordinate diagram, this quantity equals the difference between the maximum and starting y-values. For 10 points, catalysts lower what quantity, the amount of energy (10[1])needed for a reaction to proceed? ■END■ (10[1])