Ch_322a_10.02

Ch_322a_10.02 - Homolytic Bond Dissociation Energies When...

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Homolytic Bond Dissociation Energies H . H . + H-H ! H o = - 104 kcal/mol an exothermic reaction To break a covalent bond, energy must be supplied. Such a reaction is endothermic . H-H H . H . + ! H o =+ 104 kcal/mol an endothermic reaction energy H-H H . H . + 104 kcal/mol The energy required to break a covalent bond homolytically is the homolytic bond dissociation energy, DH o . When chemical species (atoms or molecules) with unpaired electrons (radicals or atoms) combine to form a covalent bond, energy is released . The state with the covalent bond is more stable than the state with the unpaired (nonbonding) electrons. This reaction is exothermic. ...it evolves heat.
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Homolytic Bond Dissociation and Heats of Reaction The standard enthalpy change, ! H o , for a reaction can be calculated from an evaluation of the bond dissociation energies ( DH o ) of the bonds being broken and the bonds being made.
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Ch_322a_10.02 - Homolytic Bond Dissociation Energies When...

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