Lecture 8 - Lecture 8: Quantum Theory of the Chemical Bond...

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Unformatted text preview: Lecture 8: Quantum Theory of the Chemical Bond p. 202 World Records Highest electron affinity? Cl 349 kJ/mol (n.b. + sign) Lowest electron affinity? Mg -14 kJ/mol ????? Highest electron affinity? Cl 349 kJ/mol (n.b. sign) Lowest electron affinity? Mg -14 kJ/mol Fig. 5-25, p. 201 World Records World Which is thehe st m tal ? avie e . LED ?? Ozzmium!! Ene rgy Chemical Reactions Ea = Activation Ene rgy Ea Re actants Kine tics 2H2 + Exo Exo ΔH 2 2H2O O The odynam rm ics Products Re action C oordinate The Molecular Orbital Description of Chemical Reactions Molecular (Nobel Prizes: Woodward, Hoffmann, Fukoui) Fig. 6-CO, p. 211 Cowboy Chemistry The Study of Vigorous Chemical Reactions 2+ The Simplest -Classical theory 2 attractions(rA,rB) & 1 repulsion(RAB) gives only 10% of true bond energy Fig. 6-1, p. 213 The Molecular Orbital Description of Chemical Reactions Molecular Fig. 6-CO, p. 211 Cowboy Chemistry The Study of Vigorous Chemical Reactions Chemical Bond: Coherent Superposition of Atomic Orbitals Superposition + + * σ Bonding Bonding * σ Antibonding 1s H param tic agne H 1s H2 σ σ diam tic agne The Interference Term Born-Oppenheimer Approximation: AB Fig. 6-7, p. 227 Fig. 6-9, p. 228 Fig. 6-10, p. 229 Fig. 6-11, p. 230 Bond Order = 1/2[# bonding e- - # antibonding e- ] Table 6-2, p. 231 World Record Weakest Chemical Bond: He2 Bond Energy = 8 x 10-6 kJ/mol Bond Length = 62 A0 This lecture is Terminated!!! ...
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This note was uploaded on 09/29/2009 for the course CHEM 4a taught by Professor Gordon during the Fall '06 term at University of California, Berkeley.

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Lecture 8 - Lecture 8: Quantum Theory of the Chemical Bond...

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