2010-01-27 - Phases and Phase Transitions

2010-01-27 - Phases and Phase Transitions - PHYSICAL...

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PHYSICAL EQUILIBRIA: Ch. 16 – Vapor Pressure/Phase Diagrams References: - Chemical Principles, Steven S. Zumdahl, Fifth Edition, Houghton Mifflin Custom Publishing, Boston, MA - Professor Paul Mc Cord Notes, CH 302, University of Texas at Austin 1
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Intermolecular forces : Forces of attraction between molecules. If molecules had no sticking power, all substances would be gases. They govern boiling point, surface tension, viscosity, etc Intermolecular forces are responsible for the existence of several phases (solid, liquid, gas). A condensed phase means simply a solid or liquid phase. CONDENSED PHASES FORM WHEN ATTRACTIVE FORCES BETWEEN PARTICLES PULL THEM TOGETHER!! 1 – INTERMOLECULAR FORCES
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Viscosity : It is the resistance of a liquid to flow. Depends on the forces between liquid molecules. Strong interaction hold molecules together Viscosity decreases as the temperature rises. Molecules have more energy at high temperatures and can move more readily Surface tension : A measure of the tightness of the surface film that
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2010-01-27 - Phases and Phase Transitions - PHYSICAL...

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