SJSU Chem 6-1 - The First Law of Thermodynamics...

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1 The First Law of Thermodynamics Thermodynamic transformations Signs for heat ( q ) and work ( w ) q is + if heat is added to system is if heat is lost by system w is + if work is done on the system. is if work is done by the system.
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3 System and Surroundings 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. Thermal reservoir 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)
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Different paths in the Expansion of a gas Consider the expansion of an ideal gas with various coupling between it (the system) and the surroundings Free expansion (No external Pressure) Isothermal (Constant Temperature) Adiabatic (No heat transfer) Isobaric
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SJSU Chem 6-1 - The First Law of Thermodynamics...

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