States of Matter (2) - strong dipole-dipole interaction...

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1 CHEMISTRY 139 – Chemistry: Physical Principles Gases Liquids and Solids Chapt. 12: 12.1 – 12.6 Solutions Unit 2 States of Matter d d d d d + d + d + d + d + d + d + d + d d d d d d d d Intermolecular Forces Dipole: separation of partial positive and negative charges in a molecule, arising from the unequal sharing of electrons in polar bonds. - geometry is important: dipole = polar molecule This dipole is permanent! - keep liquids as liquids and many solids as solids! O H H O H H Ion-Dipole
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2 Hydrogen Bonding:
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Unformatted text preview: strong dipole-dipole interaction Dipole-Dipole d + d d X H Y X, Y = N, O, F Solid Liquid Dispersion (or London) forces At some point in time, E.g. Ne atom 3 London force Polarizability : susceptibility of an atoms electron cloud to distortion by a neighbouring charge strength depends on polarizability - increases with the number of electrons which increases with molecular mass. b.p. ( o C) F 2-188 Cl 2- 34 Br 2 59 I 2 185 - increase in London forces between molecules Basis Energy (kJ/mol) Example...
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This note was uploaded on 12/15/2011 for the course CHM 139 taught by Professor Browning during the Spring '08 term at University of Toronto- Toronto.

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States of Matter (2) - strong dipole-dipole interaction...

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