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Per7_over - Preview of Period 7 Applications of the Laws of...

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Preview of Period 7: Applications of the Laws of Thermodynamics 7.1 Conservation of Energy and the 1 st Law of Thermodynamics How does conservation of energy relate to molecular motion? What is the 1 st Law of Thermodynamics? 7.2 Ideal Gas Law How are pressure, volume, temperature, and the number of gas molecules related? 7.3 Work from Thermodynamic Systems How is work related to equilibrium? 7.4 Engines and Work How do internal and external combustion engines work? 7.5 Air Conditioners, Refrigerators, and Heat Pumps How do they work? How efficient are they? 7-1
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The Entropy Story so far ... Entropy is a measure of the degree of disorder of a system. The greater the disorder, the greater the amount of entropy. In nature, disordered systems are more common than ordered systems because there are many more disorderly arrangements than orderly arrangements. Entropy tends to increase with time. If the temperature is constant, the change in entropy is given by S = Q / T 7-2
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The law of conservation of energy: Energy can be neither created nor destroyed.
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