L22ThermoIII145s10

L22ThermoIII145s10 - Lecture 22, spring 2010 ENGR 145,...

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Unformatted text preview: Lecture 22, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Reading assignment : OGC 10.4-10.6; 14.1-14.2; eq. [14.4]; 14.6-14.7; C&R 10.1-10.6 Learning objectives: Learn how to read a phase diagram for a pure substance Understand equilibrium in chemical reactions as a dynamic balance of two opposing processes Understand the law of mass action: Equilibrium constant, K Relationship between K and G Use Le Chteliers principle to predict how a system in equilibrium will respond to changes in the surroundings Lecture 22: One-Component Phase Diagrams; Chemical Equilibrium 1 Lecture 22, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Place water in flask Seal & evacuate flask Hold flask & contents at 25 C Monitor P inside flask Q: What happens? A: Gradually, Liquid evaporates OGC Figure 10.16 Phase Transitions [OGC 10.4-10.5] 2 Lecture 22, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Place water in flask Seal & evacuate flask Hold flask & contents at 25 C Monitor P inside flask Q: What happens? A: Gradually, Liquid evaporates P rises When P reaches 0.03126 atm, rate of evaporation matches rate of condensation two-phase equilibrium OGC Figure 10.16 Phase Transitions [OGC 10.4-10.5] 3 Lecture 22, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University OGC Figure 10.21 One-Component Phase Diagram [OGC 10.6] 4 Evaporation-condensation: curve C-T (25 C, 0.03126 atm) is one point on this curve Melting-freezing: curve B-T Sublimation-deposition: curve A-T Triple point Solid, liquid, and gas coexist in equilibrium C: Critical point At T or P beyond C: Supercritical fluid liquid and gas are indistinguishable Lecture 22, spring 2010 ENGR 145, Chemistry of Materials...
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This note was uploaded on 01/30/2011 for the course EMSE 103 taught by Professor Ggh during the Spring '10 term at Case Western.

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L22ThermoIII145s10 - Lecture 22, spring 2010 ENGR 145,...

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