230_Sp10_L13_post-1 - CHEM 230 Sp10 Lecture 13 Chapter 8:...

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CHEM 230 Sp10 Lecture 13 Chapter 8: Physical equilibria Phase Transitions: 1) solid liquid 2) liquid gas 3) phase diagrams Session ID: 230
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Solid ←→ Liquid Supercooled water: http://www.youtube.com/watch?v=Rsu30g6Rmp4 T m = melting point Normal melting point = temperature at which a solid melts at 1 atm Standard melting point = temperature at which a solid melts at 1 bar http://www.absorblearning.com/media/item.action?quick=s6
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Thermodynamics of Melting and Freezing Δ H fus: enthalpy of fusion latent heat of fusion specific melting heat Δ S fus = Δ H fus /T m Δ G fus = Δ H fus - T m * Δ H fus /T m = 0 equilibrium
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T m and Pressure Most of time T m increases with pressure Solid is more dense than liquid T m decreases with pressure H 2 O solid is less dense than liquid
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Solids less dense (g/mL) than liquids http://www.cepolina.com/freephoto/f/other.food/glass.water.ice2.jpg gallium - 5.91 (solid) vs 6.095 (liquid) bismuth - 9.78 (solid) vs 10.05 (liquid) germanium - 5.323 (solid) vs 5.60 (liquid) silicon - 2.3290 (solid) vs 2.57 (liquid) water - 0.917 (solid) vs 0.998 (liquid)
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←→ Gas
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This note was uploaded on 01/24/2012 for the course PCHEM 230 taught by Professor Gottfried during the Fall '11 term at University of Michigan.

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230_Sp10_L13_post-1 - CHEM 230 Sp10 Lecture 13 Chapter 8:...

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