Lecture 32 11102008 - Thermodynamics ,8 and9ONLY Labclass:...

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Announcements Chapter 9 “Energy and Chemistry”.   Homework due Wednesday November 12 Chapter 10 “Entropy and Second Law of  Thermodynamics” Next Exam November 12 on Chapters 7, 8  and 9  ONLY Lab class: start Kinetics lab the following  week, handout on Thermodynamics this week Class on November 14:   Guest Lecturer: Dr. Ted Gauthier  Gibbs Free  Energy and Introduction to Kinetics
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Exothermic and Endothermic Reactions Exothermic Reactions Combustion Reactions Energy released in bond formation exceeds  energy absorbed in bond breaking H o  is negative Endothermic Reactions Reactions that absorb energy as they occur Photosynthesis H o  is positive
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Spontaneity Spontaneous:   “Able to occur without  continuous outside intervention” “Thermodynamically allowed” For a chemist, prediction of spontaneity is a  major goal of thermodynamics Factor in Spontaneity Energy:   E or  H Not a good predictor.  Both endothermic and  exothermic reactions can occur spontaneously Some process are spontaneous only at certain  temperatures
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Entropy,  S  :  measure of molecular disorder  in a system denoted Units of J/K (Joules per Kelvin). S  =  S final  –  S initial Positive  value of  S  indicates  increased  disorder . Negative
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This note was uploaded on 08/29/2010 for the course CHM 2045 taught by Professor Brant during the Fall '08 term at University of South Florida.

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Lecture 32 11102008 - Thermodynamics ,8 and9ONLY Labclass:...

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