Sept_26 - Intermolecular Forces Attractive forces between...

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Intermolecular Forces •Attractive forces between molecules •Are all based on dipole-dipole interactions •The larger the dipoles, the stronger the interaction
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Intermolecular Forces Weak forces exist between molecules called van der Waals forces. The nature of the interaction depends on the polarity of the individual molecules. Polar molecules, with permanent dipoles , have dipole- dipole interactions which can affect properties such as melting point and boiling point.
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Molecular Shapes and Dipole Moments Bond dipoles are added as vectors to give molecular dipoles. CCl 4 CHCl 3 non-polar polar
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Random electron density fluctuations in a non polar species may result in an instantaneous dipole . This can result in an induced dipole in nearby molecules This causes a weak attraction temporary attraction called a dispersion or London force Dispersion (London) Forces
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Polarizability Example: Arrange in order of increasing boiling point He, Ne, Cl 2 , (CH 3 ) 2 CO, O
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This note was uploaded on 01/20/2011 for the course CHEM 154 CHEM 154 taught by Professor Yang during the Spring '10 term at The University of British Columbia.

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Sept_26 - Intermolecular Forces Attractive forces between...

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