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Lec-27-Chap-11-1 - Properties of Liquids CHE 131 Lecture 26...

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CHE 131 Lecture 26 – Phases and Phase Diagrams Chapter 11: pp. 488-492. pp. 494-507. Properties of Liquids surface tension – the energy required to overcome the attractive forces between molecules at the surface capillary action – the process whereby a liquid rises in a small–diameter tube due to noncovalent interactions between the liquid and the tube’s material viscosity – resistance of a fluid to flow Fig. 11-1, p.489 Surface Tension
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p.490 Surface Tensions of Some Liquids Meniscus Vapor vs. Liquid States volatility – tendency of a liquid to vaporize vapor pressure – pressure of the vapor above the surface of a liquid Liquid particles with sufficient kinetic energy escape. Gas particles with insufficient kinetic energy are trapped.
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Fig. 11-9, p.495 Vapor pressure of water in atmosphere is expressed as the relative humidity . Liquid & Gaseous Molecules Phase Changes Red arrows – endothermic processes (require heat) Blue arrows – exothermic processes (require cooling ) Solids - ordered - tightly packed - E pot
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