Lect+7+08 - A plain language understanding of Fluidity and...

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A plain language understanding of Fluidity and Rigidity - Surface tension Intermolecular Interactions A plain language understanding of the ideas and concepts related to equilibrium for phase transitions At equilibrium: Evaporation rate = Condensation rate
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Suggestions for succeeding in Chem 230 Read the chapter well before lectures Work through the examples as you read the chapter Take an active active position during the lectures Work the problems at the end of the chapter Resolve understanding issues through interactions with the course staff or your colleagues
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PV = nRT PV nRT z = z>1 Repulsive interactions dominate z = 1 for an ideal gas z<1 Attractive interactions dominate (small molecule- molecule distances
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Molar Volumes Molar Volume - the volume occupied by one mole of a substance At 298 K and 1 atm a typical solid or liquid occupies 10 to 100 cm 3 /mole, a gas occupies 24,000 cm 3 /mole Molecules in solids and liquids are touching. In the gas the molecules are separated widely in space. Compressibility - fractional decrease in volume with increasing pressure. Gases are very compressible, liquids and solids are not very compressible Thermal expansion coefficient - the fractional increase in volume with increasing temperature.
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