what's the difference between vanderwaals forces and dipole dipole interaction
2 answers
Van Der Walls forces account for both weak dipole dipole interactions in slightly polar molecules and for even weaker interactions between nonpolar molecules. London Forces are specifically limited to weaker interactions between nonpolar molecules. One is more general than the other (at least that is my understanding anyways), but the two terms can be used (scratch that..."are" used) interchangeably to mean weak interactions between non-polar molecules.
antoine.frostburg.edu/chem/senese/101/liquids/faq/h-bonding-vs-london-forces.shtml