00:01
Okay, so here we have an intermolecular forces problem, and we want to figure out what kind of intermolecular forces we expect between beryllium diiodide.
00:09
So, bei2.
00:13
So, beryllium diiodide is an ionic compound, and we know this because we have a metal and a nonmetal binding here.
00:26
But those are the intramolecular forces, an ionic bond, but we're considering intermolecular forces between different beryllium iodide molecules.
00:38
So if we think about the presence of dipole -dipole forces, we require there to be a dipole within the molecule.
00:46
Induced dipole or london dispersion forces are forces that are present in all molecules.
00:59
They are due to the movement of electrons within a system.
01:02
And so as those electrons move around an atom, they create small pockets of areas where there are more electrons than other areas, and so that creates small partial negatives and small partial positives throughout the atom.
01:17
And so those are constantly occurring for very small fractions of a second, and they occur on all molecules that have electrons that move, so basically all molecules.
01:29
So and then lastly we have hydrogen bonding.
01:32
Hydrogen bonding requires hydrogen to be able to interact with a lone pair on a nitrogen, oxygen, or fluorine or other similar electronegative atom and this hydrogen also needs to be attached to one of those electronegative atoms...