chem lecture 24

chem lecture 24 - General Analytical Chemistry II 1011-216...

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1011-216 Winter 2008 Lecture 24
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Phase Transitions
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“A watched pot doesn’t boil” Start finish
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Energy Changes in Phase Transitions _____ Energy to break bonds _____ Energy to increase motion
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Enthalpy Changes in Phase Transitions • The enthalpy change for a process conducted at constant pressure is equal to the heat transfer. q P = H • The heat transfer required to increase molecular motion is given by: q P = H = mC s T • The heat transfer required to affect a phase change is: H vap = enthalpy change of vaporization H fus = enthalpy change of melting H subl = enthalpy change of sublimation
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Enthalpy Changes of Phase Transitions Liquid Solid H solidification = - H melting ( H fus ) Liquid Gas H condensation = - H vaporization Solid Gas H deposition = - H sublimation
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This note was uploaded on 03/18/2010 for the course COS 101121501 taught by Professor Langner during the Fall '08 term at RIT.

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chem lecture 24 - General Analytical Chemistry II 1011-216...

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