Lecture 9 23-46-38 - The Molecular Orbital Description...

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Unformatted text preview: The Molecular Orbital Description Molecular of Chemical Reactions Fig. 6-CO, p. 211 Cowboy Chemistry The Study of Vigorous Chemical Reactions Energy Chemical Reactions Ea Reactants Kinetics Ea = Activation Energy 2H2 + ΔH 2 2H2O Thermodynamics O Exo Exo Products Reaction Coordinate Electron Transfer Reaction Nobel prize…..R. Marcus IO3- + 6H+ + 5I- = 3I2 + 3H2O Rate ~ k(T) = Aexp(-Ea/RT) Lecture 9: Molecular OrbitalsDiatomics p. 202 ChemQuiz© 17.1 Which of the following diatomic species becomes more stable upon ionization? e­ 1) H2 2) He2 3) Li2 L11­6 © 2001 A.Pines,M.Kubinec,UC Regents ChemQuiz© 17.1 Solution ChemQuiz * * * H2+ H2 σ 1s σ He2 + σ 0 1/2 1s σ Li22+ σ 1 1/2 + 2s σ BO BO ions molecules 1 1/2 1) H2 2) He2 3) Li2 Bond Order = 1/2[# bonding e- - # antibonding e- ] Table 6-2, p. 231 Fig. 6-7, p. 227 World Record Longest Chemical Bond: He2 Bond Energy = 8 x 10-6 kJ/mol Bond Length = 62 A0 World Record Shortest Chemical Bond: H2 Bond Length = 0.74 A0 World Record Strongest Single Chemical Bond: H2 Bond Energy = 431 kJ/mol Frontier Orbitals Frontier + + * σ Bonding * Li2 Be σ Antibonding2 σ * (2s) He 1s He2 σ σ 1s He σ (2s) P-orbital bonding σ * π * π + + x * z x y y * * z σ σ π x π y x y 2p 2p 2p 2p 2p 2p Fig. 6-13, p. 233 Fig. 6-14, p. 234 The Molecular Orbital Description Molecular of Chemical Reactions Fig. 6-CO, p. 211 Cowboy Chemistry The Study of Vigorous Chemical Reactions Energy Chemical Reactions Ea Reactants Kinetics Ea = Activation Energy 2H2 + ΔH 2 2H2O Thermodynamics O Exo Exo Products Reaction Coordinate Electron Transfer Reaction Nobel prize…..R. Marcus IO3- + 6H+ + 5I- = 3I2 + 3H2O Rate ~ k(T) = Aexp(-Ea/RT) Lecture 9: Molecular OrbitalsDiatomics p. 202 ChemQuiz© 17.1 Which of the following diatomic species becomes more stable upon ionization? e­ 1) H2 2) He2 3) Li2 L11­23 © 2001 A.Pines,M.Kubinec,UC Regents ChemQuiz© 17.1 Solution ChemQuiz * * * H2+ H2 σ 1s σ He2 + σ 0 1/2 1s σ Li22+ σ 1 1/2 + 2s σ BO BO ions molecules 1 1/2 1) H2 2) He2 3) Li2 Bond Order = 1/2[# bonding e- - # antibonding e- ] Table 6-2, p. 231 Fig. 6-7, p. 227 World Record Longest Chemical Bond: He2 Bond Energy = 8 x 10-6 kJ/mol Bond Length = 62 A0 World Record Shortest Chemical Bond: H2 Bond Length = 0.74 A0 World Record Strongest Single Chemical Bond: H2 Bond Energy = 431 kJ/mol Frontier Orbitals Frontier + + * σ Bonding * Li2 Be σ Antibonding2 σ * (2s) He 1s He2 σ σ 1s He σ (2s) P-orbital bonding σ * π * π + + x * z x y y * * z σ σ π x π y x y 2p 2p 2p 2p 2p 2p Fig. 6-13, p. 233 Fig. 6-14, p. 234 Fig. 6-16, p. 236 ChemQuiz© 17.3 Consider ionization and electron Consider capture in N . Which is true of the N N e­ N N ­ e­ N 1) N2 > N2 2) N2 ~ N2 3) N < N2 + ­ + ­ 2 + + N ­ ChemQuiz© 17.3 Solution N2 ­ N2 + N2 BO 2.5 + ­ 3 + ­ 2 + 2.5 ­ 1) N2 > N2 2) N2 ~ N2 3) N < N2 1) Fig. 6-15, p. 235 Table 6-3, p. 237 World Record Strongest Homonuclear Chemical Bond: N2 Bond Energy = 942 kJ/mol Bond Length = 1.10 A0 p. 255 Fig. 6-18, p. 238 This lecture is Terminated!!! ...
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