9-9.4 - We are not going to fool with Mother Nature...

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1 Thermodynamics Kinetics The study of energy & its transformations Energy content of Enthalpy Heat content Entropy Disorder Will the rxn happen? Section 9.0 by what mechanism will the reaction occur? Mother Nature Heat Miser Cold Miser We are not going to fool with Mother Nature. We are just going to try to understand her. In thermodynamic terms, reactions in which energy is lost are preferred (also know as exothermic) What happens in Jurassic Park when Mother Nature is in charge? #1 The fences lose energy. What happens in Jurassic Park when we let Mother Nature have her way? #2 The dinosaurs spread out over the park. In thermodynamic terms, reactions in which energy is spread out are preferred (also know D S > 0) Section 9.1 Energy is neither created nor destroyed in any process. The “form” of the energy can change in a process. Heat: disorganized energy something we feel Work: organized energy something we see D E system = q + w Heat: disorganized E Work: organized E D E univ = D E system + D E sur = ZERO q > 0: heat is absorbed by the system q < 0: heat is released from the system Section 9.1 w > 0: work is done on the system w < 0: work is done by the system
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2 D E system = - D E sur D E univ = D E system + D E sur = ZERO When the system absorbs E, the surroundings must release E. When the system releases E, the surroundings must absorb E. Section 9.1 When the system absorbs E, the surroundings must release E. system Section 9.1 Solid Gas E in System Energy CO 2 (s) CO 2 (g) When the system absorbs E, the surroundings must release E. surroundings
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This note was uploaded on 03/30/2010 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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9-9.4 - We are not going to fool with Mother Nature...

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