SJSU Chem 6 - 1 The Fir st Law of Ther modynamics...

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Unformatted text preview: 1 The Fir st Law of Ther modynamics Thermodynamic transformations q is + if heat is added to system q is if heat is lost by system w is + if work is done on the system. w is if work is done by the system. Signs for heat ( q ) and work ( w ) 2 3 System and Sur r oundings Thermal reservoir Adiabatic - The orange walls insulate the system completely (no heat can pass through) Isochoric - Literally means no work. For our purposes it means the Volume is constant. Isobaric - The force on the piston from above is constant (for example atmospheric pressure) Isothermal - The thermal reservoir keeps the system at a constant temperature Free Expansion - The piston offers no resistance (there is vacuum above the brown piston) 4 Differ ent paths in the Expansion of a gas Consider the expansion of an ideal gas with var ious coupling between it (the system) and the sur r oundings Fr ee expansion (N o exter nal Pr essur e) I sother mal (Constant Temper atur e) Adiabatic (N o heat tr ansfer )...
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This note was uploaded on 09/08/2010 for the course CHEM 160 at San Jose State University .

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SJSU Chem 6 - 1 The Fir st Law of Ther modynamics...

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