intermol - Intermolecular Forces Forces Between Molecules...

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Intermolecular Forces Forces Between Molecules
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Intermolecular Forces Electrical forces between molecules causing one molecule to influence another Heats of vaporization give a measure of the strength of attractions present between molecules the energy required to separate molecules when changing from liquid to gas state
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Ionic Compounds The forces of attractions in ionic compounds are the electrostatic force between ions A relatively strong force H vap / 100 kJ/mol
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Molecular Compounds Polar Molecules
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Polar Molecules - + - + - + - + - Molecules are electrically neutral overall but organize themselves by attractions of head to tail dipole orientation Force of attraction between molecules is a dipole-dipole attraction Dipole-dipole forces are smaller than ion- ion forces H vap . 20 kJ/mol
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Hydrogen Bonding A Special Dipole-Dipole Interaction
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Hydrogen Bonding The energy of the H- bond depends on the electronegativity of the X-atom F > O > N . Cl :X- H ....... :X- H δ - δ + δ- δ +
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Μ olecule H vap (kJ/mol) Η 2 0 40.7 ΝΗ 3 23.4 C Η 4 8.2 non-polar molecule Heats of Vaporization
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Molecular Compounds Non-Polar Molecules
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intermol - Intermolecular Forces Forces Between Molecules...

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