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3AL+Lecture+3 - Melting Points Typical Phase Changes as a...

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Melting Points
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A Solid (S) B C D E Liquid (L) S L Gas (G) L G Heat Added Temperature mp, fp bp, cp Typical Phase Changes as a Function of Temperature at a Constant Pressure BC = melting point(mp)/freezing point(fp): [P solid = P liquid ] DE = boiling point(bp)/condensation point(cp): [P liquid = P applied ]
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Gas Solid Liquid P 1 Temperature External Pressure A Pressure versus Temperature Phase Diagram of a Typical Organic Compound
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C P 2 Gas Solid Liquid P 1 (atm) T D E Temperature External Pressure CT: Vapor pressure of a solid at a given temperature Sublimation point (sp)/ deposition point (dp) at P 2 sp,dp(P 2 ) mp,fp(P 1 ) bp,cp(P 1 ) TE: Solid-liquid equilibrium TD: Vapor pressure of a liquid at a given temperature T: Triple point: at this pressure and temperature all three phases, solid, liquid and gas are in equilibrium with each other Supercritial fluid T X P X P Y
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Melting Point or Melting Range? Close up view of a melting point capillary inside a melting point instrument It Takes Time to Melt!
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