L22 - Today's Topic: Intermolecular Forces Observation of...

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Today’s Topic: Intermolecular Forces
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CCl 4 , carbon tetrachloride H 2 O, water Observation of Polarity polar nonpolar
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Which is/are polar? ethanol acetone hexane
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Which is/are polar? ethanol acetone hexane
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Molecular Comparison of States of Matter
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Balance of Forces Determines Physical State Electrostatic potential energy (E el ) of intermolecular attractions tends to draw particles together, while the kinetic energy (E k ) of motion (proportional to temperature in Kelvin) tends to disperse them. gases: ave E k larger than ave E el of attractions between particles liquids: stronger intermolecular forces hold molecules close together, but don’t keep them from moving past one another solids: strong intermolecular forces virtually lock molecules in place (though they vibrate in place)
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(Interparticle) Forces Short-range, electrostatic attractive forces operating between the particles that make up a liquid or solid. dipole-dipole forces
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This note was uploaded on 04/20/2008 for the course CHEM 111 taught by Professor Grzegorz during the Spring '08 term at Colorado State.

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L22 - Today's Topic: Intermolecular Forces Observation of...

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