Chem241a_Lecture_14 - Or ganic Chemistry 241a Prof. Bogdan...

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Unformatted text preview: Or ganic Chemistry 241a Prof. Bogdan Olenyuk Contact Information Office: Old Chemistry 309 olenyuk@email.arizona.edu Phone: (520) 626-0754 Course web site: http://www.chem.arizona.edu/courseweb/074/CHEM241A1_2/FrameSet.html Chapter 5: Reactions and Mechanisms Thermodynamics and kinetics Structure of alkenes Today we will cover: Reading Assignment: McMurry (the BOOK), Ch. 5.8-5.11, 6.1-6.4 Describing a Reaction: Bond Dissociation Energies Bond dissociation energy ( D ): amount of energy required to break a given bond to produce two radical fragments when the molecule is in the gas phase at 25 C The energy is mostly determined by the type of bond, independent of the molecule The C-H bond in methane requires a net heat input of 105 kcal/mol to be broken at 25 C. Table 5.3 lists energies for many bond types Changes in bonds can be used to calculate net changes in heat Describing a Reaction: Energy Diagrams and Transition States The highest energy point in a reaction step is called the transition state The energy needed to go from reactant to transition state is the activation energy ( G ) Describing a Reaction: Bond Dissociation Energies Bond dissociation energy ( D ): amount of energy required to break a given bond to produce two radical fragments when the molecule is in the gas phase at 25 C The energy is mostly determined by the type of bond,...
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This note was uploaded on 08/23/2008 for the course CHEM 241A taught by Professor Olenyuk during the Fall '07 term at University of Arizona- Tucson.

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Chem241a_Lecture_14 - Or ganic Chemistry 241a Prof. Bogdan...

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