March 9, 2009

# March 9, 2009 - March 9 2009 Atomic Solids Law of Dulong...

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March 9, 2009

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Atomic Solids Law of Dulong and Petit Any atomic solid e.g. Li, U has C v = 3R Each atom three vibrations in crystal cavity.
Heat capacity 3R for crystal decreases with temperature Lower temperature can absorb less heat? AT absolute zero T = 0K, heat capacity is zero cold but can’t absorb heat. Strange phenomenon Einstein and quanta of energy

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Work W = -P ext ΔV = -P ext (V f – V i ) If V f > V i then w is negative - energy from system is used to move piston - internal energy goes down If V i >V f compression w is positive – energy goes into system
Note expansion from 1L to 10L against and external pressure of 1 atm (never never use internal pressure) W = -P ext (V f – V i ) = -1(10 – 1) = -9Latm = -900J 100J = 1Latm

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A B A bonds are broken to make B Potential energy stored in the bonds is released as kinetic energy - the internal energy of reaction CONSTANT VOLUME
Convention Exothermic Reaction

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