Ch02-A-heat work

Ch02-A-heat work - CHM 341 Elementary Physical Chemistry...

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Chapter 2: A: Heat, Work, First law CHM 341 Elementary Physical Chemistry Fall 2009 Ranko Richert
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Characterization of thermodynamic systems regarding exchange of energy and matter with surroundings Definitions: system surroundings universe Open: matter and energy can enter or escape the system. Closed: only energy can enter or escape the system, the amount of matter remains constant. Isolated: the amounts of both matter and energy remain constant in the system.
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Definitions: Heat , q , is energy in transit as a result of a temperature difference. Temperature , T , is an intensive property that is used to define the state of a system and determines the direction in which energy flows as heat. Note the signs of w and q . Temperature and energy level population according to Boltzmann, exp( E / kT ).
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a temperature difference leads to the flow of energy as heat from high T towards low T , provided that the wall separating the two systems is diathermic and not adiabatic
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adiabatic conditions: isothermal conditions: endothermic process consumes heat exothermic process releases heat endothermic process consumes heat exothermic process releases heat
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Ch02-A-heat work - CHM 341 Elementary Physical Chemistry...

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