Chem 2B-quiz 4-012407

Chem 2B-quiz 4-012407 - A thermodynamic process where...

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Chem 2B, Winter 2007 Professor Thuc-Quyen Nguyen Name: Quiz #4 01/26/07 1) ( 3 points ) What is thermochemistry? The study of the heat produced or required by chemical reactions. 2) ( 3 points ) State Hess's law. The net enthalpy change of a reaction is the same regardless of what pathway is taken to obtain the products. 3) ( 8 points ) Define each process below: - Adiabatic process A process in which no heat is gained or lost by the system (q=0) - Isothermal process A thermodynamic process where temperature is constant (ΔT=0) - Isobaric process
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Unformatted text preview: A thermodynamic process where pressure is constant (P=0)- Isochoric process A thermodynamic process where volume is constant (V=0) 4) ( 6 points ) In an isothermal and reversible process, 1 2 ln V V nRT w-= . Derive the expression for work above. = 2 1 1 2 ln 1 x x x x dx x Total work of a reversible expansion -= 2 1 V V PdV w since V nRT P = Work of reversible isothermal expansion of a perfect gas from V 1 to V 2 at const. temperature T; 1 2 ln 2 1 V V nRT V dV nRT w V V-=-=...
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This note was uploaded on 08/06/2008 for the course CHEM 2B taught by Professor Nguyen during the Winter '07 term at UCSB.

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