Ch+11Meeting+17+slides

Ch+11Meeting+17+slides - Meeting 17 Chapter 11 States of...

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1 Meeting 17 Chapter 11 States of Matter & Intermolecular Forces In Chapter 11, we return to the macroscopic world and ask such questions as: why does ice float on water? Why does dry ice sublime at room temperature? We build on intramolecular forces (chemical bonds) to include intermolecular forces
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2 Solids, liquids and gases (s, l, g) are phases: specific physical states of matter. Phase changes or Changes of State melting (s → l); freezing (l→S) vaporization (l → g); condensation (g → l) sublimation (s → g) deposition (gas → s)
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Vaporization (l → g) and Vapor Pressure Vaporization High KE molecules in liquid leave surface, form vapor. In an insulated system, T drops; in an uninsulated system (beaker) heat enters system from surroundings & T changes less. Vaporization is always an endothermic process Reverse process called condensation Enthalpy of vaporization: amount of energy (at constant pressure) required to vaporize a substance Usually expressed as a molar quantity. Other things equal,
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This note was uploaded on 11/12/2011 for the course CHEM 160:161 taught by Professor Siegel during the Fall '09 term at Rutgers.

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Ch+11Meeting+17+slides - Meeting 17 Chapter 11 States of...

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