[the_negro_puppy]

Any help would be greatly appreciated

1) in the following multipole expression V(r,?) = -k z ?  (cos ? / r²)
What approximation was made?

2) The cyanide ion CN_ possesses a dipole moment. What types of intermolecular forces operate between the two cyanide ions, and which for will dominate their interactions.

So far i have:
Ion – Ion interactions
Ion-Dipole interactions
Short Range Repulsive Forces
Dispersion Forces (due to lone pairs on carbons)

and im not sure which force will dominate their interactions.

[Donaldson Tan]

Short Range Repulsive Forces
Dispersion Forces (due to lone pairs on carbons)

I assume gas phase, so there is no interaction with solvent molecules.

How close are the 2 cyanide ions?