Chemistry 16 Wednesday, October 04, 2006

Chemistry 16 Wednesday, October 04, 2006 - Wednesday...

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Wednesday, October 04, 2006 Chemistry STATE DEPARTMENT - What happens during a change of state? - What governs melting and boiling points? TEXT: Sections 7.6 MATERIALS HAVE THERMAL ENERGY Kinetic E (motion) Depends on T MATERIALS HAVE “INTERNAL” FORCES Potential E (attractive) Depends on charge OPPOSING EFFECTS Kinetic = molecular separate Potential = molecules together RELATIVE MAGNITUDES Determine state SOLID/LIQUID TRANSITIONS 1. Solid = liquid = is equilibrium: goes both ways 2. Sold “units” oscillate around fixed positions Melting: Units leave position Move freely about (liquid) 3. Potential E favors solid Thermal (kinetic) E favors liquid Add enough thermal E (heat up enough) = melt
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Wednesday, October 04, 2006 LIQUID/VAPOR (gas) TRANSITION 1. Liquid “units” touching, not gas Liquid = vapor (gas) = is both processes occurring simultaneously (or called “dynamic equilibrium” 2. Evaporation occurs at all T More vapor at higher T 3. Vapor pressure: P exerted by molecules that evaporate
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Chemistry 16 Wednesday, October 04, 2006 - Wednesday...

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