9-25-08[lecture8]sn

9-25-08[lecture8]sn - (SN) Solutions Lecture 8 9/25/2008...

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(SN) Solutions Lecture 8 9/25/2008 ¾ Summarizing Intermolecular forces Weakest to strongest attractions: - London dispersion forces : occurs with non-polar molecules, and is also weakest attraction (when taken individually) of all and holds ALL molecules. This attraction is strongest when molecules are very close to each other. Gets stronger if molecules are larger. o Larger molecular weights of molecules dominate the dispersion forces as the strongest forces against hydrogen and dipole bonds. o Polarizability : during dispersion forces interactions ± When electrons repel one another, they cause movements of other electron density, thus; a temporary dipole - temporary dipole attraction between the + end of one temporary dipole and the – end of another molecule that is a temporary dipole. ± The bigger the molecule, the more electrons repelling each other the higher its molecular weight and polarizability--- strong London dispersion attractions - Dipole-dipole forces: occur only on polar molecules when one partially positive
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9-25-08[lecture8]sn - (SN) Solutions Lecture 8 9/25/2008...

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