9-30-08[lecture9]ht - Chem 116 Lecture 9 Sept 30 2008 Class...

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Chem 116, Lecture 9 Sept. 30, 2008 Class Notes [HT] Intermolecular Force Practice: What kinds of intermolecular forces hold the following condensed phases together? 1. H 2 O (l) London dispersion, Hydrogen bonding 2. CO 2 (s) London dispersion 3. NH 3 (l) London dispersion, Hydrogen bonding 4. CaCl 2 (s) Ionic and London dispersion 5. C 8 H 18 (l) Octane London dispersion 6. C 4 H 10 O London dispersion, Hydrogen bonding 7. HCl ( l ) Hydrogen bonding, Dipole-dipole Key concepts: London dispersion forces are weak but present in all polar and non-polar molecules. Molecular size is important in determining the strength of the London dispersion force. Dipole-dipole forces are the degrees of attraction between the positive end of a polar molecule to the negative end of another polar molecule . Visualize the Lewis structure of these molecules. Hydrogen bonding are forces that require Hydrogen atoms to be present and bond strongest to Chlorine, Nitrogen, Oxygen, and Fluorine due to their high electronegativity .
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