Per6_over - Preview of Period 6: Entropy 6.1 Order,...

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Preview of Period 6: Entropy 6.1 Order, Disorder and Entropy What defines an “orderly” pattern? What is entropy? Why does it increase? 6.2 Equilibrium and the 2 nd Law of Thermodynamics Why do systems go toward equilibrium? What is the 2 nd Law of Thermodynamics? 6.3 Reversible Process and Perpetual Motion What is an irreversible system? Is perpetual motion possible? 6-1
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Ordered and Disordered Systems An orderly system matches a specific criteria. For activity 1, an orderly arrangement consists of 3 cards with the same picture. For activity 2, an orderly arrangement consists of checker colors that match the color of the checkerboard square on which they are placed. Which are more common in nature – ordered systems or disordered systems? Why? What is the probability of drawing an ordered arrangement of checkers? 6-2
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Four-Square Board We use four squares from a checkerboard to find the probability of drawing an ordered arrangement of checkers. The arrangement is ordered if the color of the checker matches the color of the square on which it is placed. Example: Disorderly arrangement because checker colors do not match checkerboard colors. Orderly arrangement because colors match. 6-3
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R R R R R R B R R R B B B B R B B B B B 6-4
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R R R R B R B R B R R R R R R R R R B R R R R R R R R R R R R B B B R B B B B B B B B B R B R B R B B B B B B B B B R B B B B B 6-5
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Entropy (Disorder) Entropy is the measure of degree of order or disorder of a system. The greater the disorder, the greater the entropy Order and disorder are described in relation to a set of rules or properties. In most physical situations there are more disordered than ordered states. As systems change with time, they are more likely to become disordered than they are to become ordered.
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

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Per6_over - Preview of Period 6: Entropy 6.1 Order,...

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