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 (-5[1])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[3])This quantity (15[2])increases (15[1])as a result of having a lower ZPE (15[1])when a reactant is deuterated. (-5[5])As this quantity increases, (15[2]-5[5])a reaction shifts from (*) kinetic control to thermodynamic (-5[2])control. (10[1]-5[2])The (-5[1])negative (-5[1])of this quantity (10[1]-5[1])over RT (10[1]-5[1])appears (10[1])in the exponent (10[3])in the Arrhenius (10[2])equation. (10[6]-5[2])On a reaction (10[2])coordinate (10[1]-5[1])diagram, (10[3])this quantity (10[1])equals the (-5[1])difference between the maximum and starting (-5[1])y-values. (10[3])For 10 points, catalysts (10[1])lower (10[1])what quantity, (10[4])the amount (10[2])of energy (10[1])needed (10[1])for (10[1])a reaction (10[1])to proceed? (10[3])■END■ (10[11]0[2])