Liq-Solids-PDF - INTERMOLECULAR FORCES of ATTRACTION C C...

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INTERMOLECULAR FORCES of ATTRACTION C Also known as van der Waal's Forces C Intermolecular forces are responsible for many of the physical properties of molecular compounds, e.g. , BP, MP, density, and solubility. London Dispersion Forces : Interactions of temporary molecular dipoles (Nuclei attract electrons of adjacent molecules) a) London forces are present in all molecules b) The only intermolecular attractive force present in nonpolar molecules. c) Increases with increasing molecular weight (Greater numbers of protons and electrons) d) Diminishes as molecular shape becomes more compact (less surface area). Note the following nonpolar molecules : CH 4 SiH 4 GeH 4 SnH 4 MW, g/mol 16 32 77 123 BP, / C -164 -112 -89 -52 Permanent Dipole-Dipole Forces : An attractive intermolecular force resulting from the alignment of the positive end of a polar molecule with the negative end of an adjacent molecule. a)
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This note was uploaded on 11/16/2011 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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Liq-Solids-PDF - INTERMOLECULAR FORCES of ATTRACTION C C...

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