3-07orgchem - Org chem. 624 3-07-08 Homework 4 is due Wed...

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Org chem. 624 3-07-08 Homework 4 is due Wed Homework 5 will be posted on Thursday next week Due Wed after Spring Break Exam II key will be posted on Tue next week Shorter bond is a stronger bond and takes more energy to break. Bond Dissociation energies are used to calculate the enthalphy change in a reaction in which several bonds are broken and formed. Overall Enthalpy Change = sum of delta h of bonds broken and sum of delta h bonds formed When delta h is positive, more energy is needed to break bonds than is released in forming bonds. Bonds broken in starting material are stronger…slide Because delta h is negative value this reaction is exothermic and energy is released. Bonds broken in starting material are weaker than bonds formed in product. Both isooctane and glucose release energy on oxidation because the bonds in the products are stronger than the bonds in the reactants. Bond dissociation energies reveal nothing about the reaction mechanism or how fast a reaction proceeds. Bond dissociation energies are determined for reactions in the gas phase, whereas most
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This note was uploaded on 04/17/2008 for the course CHEMISTRY 624 taught by Professor Mure during the Spring '08 term at Kansas.

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3-07orgchem - Org chem. 624 3-07-08 Homework 4 is due Wed...

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