SJSU Chem 8 - Reversible Process Grains of sand 1 Remove...

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1 Reversible Process Pressure decreases by very small amount Volume increases by very small amount. Allow system to equilibrate Remove one grain of sand at a time. In limit of infinitesmal changes, system moves through equilibrium states during transition-->reversible process Grains of sand A reversible process is one where every step of the path is at equilibrium with its surroundings
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2 Examples of Reversible and Irreversible Jumping into a pool? (from the perspective of the water) Getting into a pool slowly? Free expansion of a gas Isothermal expansion (piston must move very slowly for bath) Moving a glass slowly
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3 Isothermal Reversible Process: T constant : Ideal gas For an ideal gas U=q+w=0 w=-q In rev process P ext =P gas =P=nRT/V w=-P 1 δ V -P 2 δ V- …
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4 Isothermal Reversible Process: T constant : Ideal gas For an ideal gas U= q + w =0 -w = q
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Internal energy of an ideal gas Partition is broken and gas is Allowed to expand in an adiabatic (no heat transfer container) Controlled expansion (Isothermal Reversible) the same final state No heat exchanged Heat exchanged Different paths the same initial state No work done Work done Is U is the same for both processes? Free Expansion
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SJSU Chem 8 - Reversible Process Grains of sand 1 Remove...

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