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Unformatted text preview: CH101/Ison Name: ___________, __________ Ch9 Thermodynamics I. Energy : Energy is constantly exchanged between the system and the surroundings, where… ∆E universe = ∆E system + ∆E surroundings = 0 ∆E system = - ∆E surroundings 1. If the system gives off energy, what do the surroundings do with that energy? II. Heat and work: Heat (q) and work (w) are the most common ways to exchange energy between the system and surroundings. ∆E system = q + w (+) q: heat is absorbed by the system: ENDOTHERMIC (-) q: heat is released by the system: EXOTHERMIC (+) w: work is done on the system (-) w: work is done by the system Practice problems: 1. If we assume that a hot pack is the system, what is the sign of q? _________ 2. What is the energy change of a system that absorbs 500J of heat and does 300J of work? _________________ III. Enthalpy or heat of reaction (∆H): The heat transferred in a chemical reaction (constant P) is the enthalpy or heat of reaction, ∆H Energy Reaction coordinate Energy Reaction coordinate EXOTHERMIC ENDOTHERMIC Energy Reaction coordinate Energy Reaction coordinate Energy Reaction coordinate Energy Reaction coordinate EXOTHERMIC ( - ∆H) ENDOTHERMIC (+ ∆H) Energy Reaction coordinate Energy Reaction coordinate Energy Reaction coordinate Energy Reaction coordinate EXOTHERMIC ENDOTHERMIC Energy Reaction coordinate...
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This note was uploaded on 03/29/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.
- Fall '08