Question

3.1 It is often argued that the Lennard-Jones potential, wr)-AlrBr2 is applicable to chemical bonds as well as physical bonds, where the attractive van der Waals term remains unchanged and where only a difference in the repulsive coefficient, B, distinguishes between the two types of interactions unchanged and where onlyasof interactions Consider two atoms for which A 10-77 Jm6, and where their equilibrium separation is at ro 0.35 nm and ro 0.15 nm for the case of physical and chemical binding, respectively. Assuming the above hypothesis to be true, calculate the Chapter 3 Strong Intermolecular Forces: Covalent and Coulomb Interactions 69 values of wmin 1n each case and then argue whether your result tends to support the above view.

Answer 1

hard Jones pO Thatin p plicuble or physical ond che mical bond enm TheSoundter"(%)aorre Ondrtove.nerdiei r 3 T7 r 13 0 35 x10-96

Ar 21 12. 0.15 x1 Thusんr Phys, calbond,na г cherno cal bonding @mn(r).一2-HIx10 comin (r)--4.383 XJO .019丁! each other and hence the in femuskzop dishnce betarcen then decrenses when the tu ง (bums close tv each otor (hemical bonding betucon them Jorm ahen the intom dishance smaller enough. As internucleor dixtnee decreare ho coreppo ndin q u(r) als จ decreases, hence Ifhysral bind