Dipole-Dipole Interactions. Highest b.p. The more polar the molecule, the higher is its boiling point. Give It Some Thoughts For which of the substances are the dipole-dipole attractive forces greatest?. Notes. Dipole-dipole forces are weaker than ion-dipole forces.
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The more polar the molecule, the higher is its boiling point.
Give It Some Thoughts
For which of the substances are the dipole-dipole attractive
While the electrons in the 1s orbital of helium would repel each other (and, therefore, tend to stay far away from each other), it does happen that they occasionally wind up on the same side of the atom.
At that instant, then, the helium atom is polar, with an excess of electrons on the left side and a shortage on the right side.
Another helium nearby, then, would have a dipole induced in it, as the electrons on the left side of helium atom 2 repel the electrons in the cloud on helium atom 1.
London dispersion forces, or dispersion forces, are attractions between an instantaneous dipole and an induced dipole.
Size of the atom
Boiling point as a function of molecular weight
A special case of dipole-dipole interaction
We call these interactions hydrogen bonds.Hydrogen Bonding
Examples of H bonding
How can we explain that ice floats on water
Density of ice at 0 oC is 0.917 g/mL
Density of water liquid at 0 oC is 1.00 g/mL
Ice is less dense than water?
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