Lect+8+08 - Chapter 10 Continued A plain language...

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Chapter 10 Continued A plain language understanding of Fluidity and Rigidity A plain language understanding of the ideas and concepts related to equilibrium for phase transitions At equilibrium: Evaporation rate = Condensation rate A plain language understanding of vapor pressure as a function of temperature One component phase diagrams Boiling point, melting point, triple point, critical point
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Fluidity and Rigidity Fluids - do not retain their shape Gases no significant attractive interactions - low viscosity Liquids posses definite molar volumes and have a range of viscosities Solids - Much higher viscosities than liquids ( by 10 16 ) Hardness - resistance to indentation Elasticity - ability to restore shape after stress is removed Diffusion - movement of one substance in another Gases at RT diffuse at about 1 cm/s Liquids and solids diffuse much more slowly
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The Boiling Phenomenon P vap T 1 atm T b For all liquids, the boiling point occurs where the vapor pressure equals atmospheric pressure: P vap =P atm The normal boiling point is the boiling point when the pressure of the atmosphere equals 1 atm.
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