Lec-02-Chap05-2-bare

Lec-02-Chap05-2-bare - Lec-02-Chap05-2-bare 9/2/2011...

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Lec-02-Chap05-2-bare 9/2/2011 First Principle. Heat and Work. Enthalpy. Heat capacity. Phase changes. Thermochemistry 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-Chap05-2-bare 9/2/2011 First Principle. Heat and Work. Enthalpy. Heat capacity. Phase changes. Thermochemistry 2 System and its surroundings 3 Surroundings System Energy can be exchanged between system and surroundings through the walls that separate them 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-Chap05-2-bare 9/2/2011 First Principle. Heat and Work. Enthalpy. Heat capacity. Phase changes. Thermochemistry 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). ( T sys < T surr ): Heat q flows from the surroundings to the system ( q > 0). Heat q has units of energy (J) System: gas The temperatures of the system and its surroundings are different. Energy is exchanged between the system and its surroundings through the walls . T sys T surr 5 Δ E, q, and w in a Thermodynamic process p i V f p f V i Volume pressure initial state i final state f The green ( g ) and red ( r ) processes have same initial ( i ) and final ( f ) states. and r g r i g g f r E q E E w qw E   q and w depend on the path ; Δ E does not (the internal energy E is a function of state). 6
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Lec-02-Chap05-2-bare 9/2/2011 First Principle. Heat and Work. Enthalpy. Heat capacity. Phase changes. Thermochemistry 4 First Principle of Thermodynamics Conservation of energy: energy cannot be created or destroyed. q E w  Energy exchanged by the sy Change in internal energy o stem with surroundings as f the syst heat wo r rk em o 7 8 q E w
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Lec-02-Chap05-2-bare 9/2/2011 First Principle. Heat and Work.
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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-bare - Lec-02-Chap05-2-bare 9/2/2011...

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