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230_Sp10_L05_post-1(1) - CHEM 230 Sp10 Lecture 5 Chapter 6...

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CHEM 230 Sp10 Lecture 5 Chapter 6: PV work 1) Constant T 2) Constant P 3) Constant V Session ID: 230
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NH 3(g) + HCl (g) NH 4 Cl (s) NH 3 HCl rate NH 3 rate HCl = 1 M NH 3 1 M Hcl = 1 17 1 36.5 = 1.5 = 3 2
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Kinetic energy ( E k ) : energy associated with an object by virtue of its motion E k = 1/2 mv 2 Potential energy (E P ) : energy an object has by virtue of its position in a field of force E p = mgh Internal energy ( E i ) : Sum of kinetic and potential energies of particles (aka U) Law of conservation of energy : total quantity remains constant, only converted from one form to another Energy : the potential or capacity to move matter (to do work )
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Work: motion against an opposing force 1 J = 1 (kg m 2 )/s 2 1 J = beat of human heart = energy to raise a small apple 1 m off of floor
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Focus: Gas Expansion Work Work = force * distance = P ex *A* Δ d w = -P ex Δ V Δ V = V f - V i A d Sign of work indicates perspective of system Work done by system < 0 (expansion; V f >V i ) Work done on system > 0 (compression; V f < V i )
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Work *note we will only address the change in two variables (T, P, and V) for any given process Generally assume a closed system (n is constant) Constant T (Isothermal )
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