CHAPTER+11 - 1 Intermolecular Forces Dipole-Dipole Polar...

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1 Intermolecular Forces Dipole-Dipole ˚ Polar molecules London Dispersion ˚ Non-polar and Polar molecules Instantaneous dipole Hydrogen Bonding ˚ Molecules must have a H-F, H-O, H-N bond 2 London’s Forces All molecules have London’s attraction in liquid and solid state Larger molecules have more attraction Size of molecules increases with molecular weight generally Non-polar molecules have only London’s forces to hold them in a condensed state ˚ He, CH 4 , and N 2 are gases at room temp. ˚ Can be condensed at low temp. 3 Dipole-dipole and Hydrogen Attraction Dipole ˚ H-Cl, H 2 O, and HCN + - + - H H O O H H Hydrogen Bonding
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4 Picture of Dipole-Dipole 5 Hydrogen Bonding O H H H O H H O H 6 More Hydrogen Bonding N H H H N H H H N H H H
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7 Relative Effect For same size small molecules ˚ Hydrogen> Dipole-Dipole> London’s Chemical Bonding> IMF 8 Properties Effected by IMF Viscosity Surface Tension Vapor pressure Boiling Point Heat of Vaporization Heat of Fusion Melting Point 9 Vapor Pressure
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CHAPTER+11 - 1 Intermolecular Forces Dipole-Dipole Polar...

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