lec5 - Last Time Van der Waals Forces Intermolecular...

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1 Last Time c Van der Waals Forces – Intermolecular interactions – Useful for trends in molecular properties c Liquids – viscosity, surface tension c Solids – metallic, ionic, molecular, network – hcp, ccp, fcp(rock salt), bcc(CsCl) Metallic Properties • Well ordered cations (+) in a delocalized array of electrons. Change nature of cations alloy. – Insulator - does not pass electricity, high R – Conductor - R increases with T – Semiconductor - R decreases with T – Superconductor - R = 0 below T c
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2 Metallic Materials Metal Mixtures – Alloys • Intentional metal defect site – solid solution – Homogeneous – brass, bronze – Heterogeneous – solder, amalgam – Substitutional – one–to–one replacement (15% radius difference) – Interstitial – random array (60% radius difference) Substitutional Alloys
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3 Interstitial Alloys Phase Changes • At 1 atm liquids boil at T b and freeze at T f • Dynamic equilibrium – always vapor liquid vapor • Vapor pressure – gas pressure above a
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lec5 - Last Time Van der Waals Forces Intermolecular...

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