LECTURE3 - Last Time System and Surroundings Energy(Kinetic Potential Thermal energy(random kinetic Heat Flow of energy due to T difference

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Last Time System and Surroundings Energy (Kinetic & Potential) Thermal energy (random kinetic) Heat – Flow of energy due to T difference Conservation of energy Heat capacity and specific heat capacity How we measure heat Heats associated with chemical reactions Note: J / g / °C J / (g · °C) Work, w Pressure acting through a volume change: P = F / A (units N / m 2 = Pa), w = - F d = - (P A) d= - P V w = – P ext V Force acting through a distance: w = - F d e.g. Lift 1 kg up by 1 m: w = - Pa m 3 = (N/m 2 ) m 3 = N m = kg m 2 /s 2 = J d A A d= V
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PV-Work Piston at rest at 1atm external pressure. P ext = 2 atm P ext = 1 atm Suddenly external pressure increased to 2 atm and system V decreases: The V change is occurring due to a constant applied pressure P ext = 2atm . w = – (2 atm)  V Work Calculation – Example 11C 1 mol Ne gas at room temperature (298K) is compressed when the external pressure is increased from 1 atm to 2 atm. Find the work done on the system (in Joules). Assume Ne gas ideal: PV=nRT Units: 1 atm = 101325 Pa
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State Functions Any property that has a unique value for a
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This note was uploaded on 07/09/2011 for the course CHE 2B 2B taught by Professor Tobyallen during the Spring '11 term at UC Davis.

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LECTURE3 - Last Time System and Surroundings Energy(Kinetic Potential Thermal energy(random kinetic Heat Flow of energy due to T difference

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