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Just to clarify, do all molecules experience London dispersion forces or only some? I thought that they were present in all molecules but in Sapling I had to choose between London dispersion forces and other types of forces so I wasn't sure.
I remember in lecture that Lavelle said dispersion interactions are always present/occurring because of electron density fluctuating which causes fluctuating induced dipole- induced dipole moments.
All molecules do exhibit London dispersion forces! They exist between ionic and covalent molecules, in both polar and non polar molecules. For my sapling question at least, it was dispersion and dipole-dipole, but the answer should be one that has both unless the question asked just for the strongest force.
Yes all molecules have London dispersion forces, and it is one of the weakest intermolecular forces. When two molecules come in close proximity they "induce" a partial negative/positive on each other instantaneously making it temporary.
Tatyana Bonnet 3H wrote:Yes all molecules have London dispersion forces, and it is one of the weakest intermolecular forces. When two molecules come in close proximity they "induce" a partial negative/positive on each other instantaneously making it temporary.
I'm unsure if I am correct on this but I believe it was mentioned that elements further to the lower-right of the periodic table tend to see these kinds of interactions more due to the larger number of electrons present within their shells.
Yes, all molecules have London Dispersion Forces. Professor Lavelle said in his lecture that these forces are "always present and attractive." I think this is because the electron densities are always fluctuating, which cause the dipoles to also fluctuate.
All molecules do experience London Dispersion Forces but when it comes to problems like that, I think they want us to focus on the stronger intermolecular forces and if there are other forces present, LDFs will always be the weakest.
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