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12-4-07%20-%20Lecture%2021%20-%20Chapter%205

12-4-07%20-%20Lecture%2021%20-%20Chapter%205 - Liquids...

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Liquids, Solids Liquids, Solids & Intermolecular Forces & Intermolecular Forces
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WHY? WHY? Why is water usually a liquid and not a gas? Why does liquid water boil at such a high temperature for such a small molecule? Why does ice float on water? Why are NaCl crystals little cubes? Why is I 2 a solid whereas Cl 2 is a gas?
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Inter- Inter- molecular  molecular  Forces Forces We have studied INTRA- molecular forces—the forces holding atoms together to form molecules (covalent bonds). Now we turn to forces between molecules — INTER molecular forces. Forces between molecules, between ions, or between molecules and ions.
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Intermolecular Forces Intermolecular Forces
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London Forces London Forces Formation of a dipole in two nonpolar enthane (CH 3 CH 3 ) molecules.
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London Forces and electrons London Forces and electrons The magnitude of the induced dipole depends on the tendency to be distorted (polarizability).
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