Lec-02-Chap05-2-Complete

Lec-02-Chap05-2-Complete - Lec-02-Chap06-2-Complete...

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Lec-02-Chap06-2-Complete 9/7/2011 Chemical Thermodynamics 1 Email questions should be submitted to [email protected] . Emails sent to instructors’ personal accounts may be lost . 1 Lec-02: Chemical Thermodynamics Chapter 5 - Continued Thermodynamic process p i V f p f V i Volume pressure initial state i final state f Energy change in the process     internal final state initial state fi E f E i E E E E  2
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Lec-02-Chap06-2-Complete 9/7/2011 Chemical Thermodynamics 2 System and its surroundings 3 Surroundings System Energy can be exchanged between system and surroundings (through the walls that separate them) in the for of heat (q) and work (w) . Change in internal energy of the syste ? m E   Interaction of the system with the surroundings: work w System: gas The system volume changes. Energy is exchanged between the system and its surroundings by the motion of the walls . Expansion (Δ V > 0): The system performs work ( w < 0). Compression (Δ V < 0): Work is performed on the system ( w > 0). Work w has units of energy (J) 4
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Lec-02-Chap06-2-Complete 9/7/2011 Chemical Thermodynamics 3 Interaction of the system with the surroundings: heat q ( T sys > T surr ): Heat q flows from the system to the surroundings ( q < 0). Exothermic Process . ( T sys < T surr ): Heat q flows from the surroundings to the system ( q > 0). Endothermic Process . Heat q has units of energy (J) System: gas The temperatures of the system and its surroundings are different.
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-02-Chap05-2-Complete - Lec-02-Chap06-2-Complete...

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