Intermolecular Forces Notes

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Presentation transcript:

Intermolecular Forces Notes On Level Unit 2

Intermolecular Forces Intermolecular Forces: attraction between molecules Much weaker than chemical bonds

Strength of Forces STRONGEST Ionic Bonds Covalent Bonds (400 kcal) Hydrogen Bonding (12-16 kcal) Dipole-Dipole Interactions (0.5-2 kcal) London Dispersion Forces (<1 kcal) WEAKEST kcal = kilocalorie (unit of energy stored in chemical bonds)

Dipole Dipole-dipole: Attraction between polar molecules The squiggly symbol means a partial charge.

An Analogy Dipole-dipole attraction - - - - - - - The two couples are very happy with each other, but the guy is attracted to the other girl.

Hydrogen Hydrogen Bonding: Stronger type of dipole-dipole interaction Occurs only between molecules with hydrogen bonded to F, O, or N Hydrogen bonding is FON!

London-Dispersion Forces Weakest type of intermolecular interaction Occurs between ALL molecules near one another!