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Unformatted text preview: ions attract one another - electronegativity difference is greater than 1.7 B: Intermolecular Forces- forces that exist between molecules 1. London dispersion forces-a weak force that exists between all molecules -due to a temporary charge -the larger the molecules the longer the temporary force lasts; usually liquids or solids like lipids-the smaller the molecules the shorter the temporary force lasts; usually in gases like methane 2. dipole-dipole forces-forces between polar molecules 3. hydrogen bonding-forces that exist between H (which is part of a molecule) and O, N, F (something with a high electronegativity that is also part of another molecule)-a type of dipole-dipole Electronegativity Table p. 14...
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- Fall '09