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CHEM 433 – 11/5/10

CHEM 433 – 11/5/10. V. Phase Equilibria (Pure Substances) • Derivation of Phase Boundaries (4.6) • Eherenfest Classification of Phase Transitions (4.7): 1st order vs. 2nd order READ: FINISH CHAPTER 4. Thermodynamic Criterion of EQ:

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CHEM 433 – 11/5/10

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  1. CHEM 433 – 11/5/10 V. Phase Equilibria (Pure Substances) • Derivation of Phase Boundaries (4.6) • Eherenfest Classification of Phase Transitions (4.7): 1st order vs. 2nd order READ: FINISH CHAPTER 4

  2. Thermodynamic Criterion of EQ: “At equilibrium, the chemical potential of a substance is the same throughout the sample, regardless of how many phases are present.”

  3. A typical Clausius-Claperon problem: At sea level (Patm=760 Torr), H2O boils at 100°C. What is Tb in Boulder, CO (Patm= 620 Torr)? 106 °C b) 100°C c) 96°C d) 72 °C (Let’s look at the diagram and think first!)

  4. Sample Exam #4 problem: Starting from the Claperon Equation: Show that the solid-vapour phase boundary is given by: Where subH and subV refer to sublimation.

  5. http://en.wikipedia.org/wiki/Glass_transition_temperature

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