Roger Cramer and Thomas Bopp graphically demonstrated why this model cannot accurately rank the strengths of Lewis acids or bases without considering their adduct pair. For 10 points each:
[10h] Name this model that calculates acid-base interaction strengths using two namesake bond formation terms and a dissociation energy term. This model complements the qualitative Pearson hard-soft acid-base model.
ANSWER: ECW model [accept E and C parameters or electrostatic and covalent parameters in any order; accept Drago–Wayland model]
[10e] This quantity is the inverse of the sum of both acid and base electrostatic and covalent parameters. The change in this quantity, symbolized H, is equal to delta Gibbs free energy plus temperature times delta entropy.
ANSWER: enthalpy [accept enthalpic term]
[10m] Unlike HSAB, the ECW model does not consider this quantity for any compound. Raman scattering intensity scales with this quantity, which measures how easily electron clouds are distorted in an electric field.
ANSWER: polarizability [accept electric polarizability or molecular polarizability; reject “polarization”]
<AL, Chemistry>