L19S07_Hybridization MOs, Resonance 03-02-07

L19S07_Hybridization MOs, Resonance 03-02-07 - L19:...

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Unformatted text preview: L19: "Hybridization MOs, Resonance" Covalent Bonding, Molecular Orbitals Covalent Bonding, Molecular Orbitals + Summary + H2 He2 Bonding: Antibonding: * Antibonding: Li2 Be2 + + * He 1s L13-1 Bonding * Antibonding Li2 Be2 * (2s) * 1s A.Pines,M.Kubinec,UCB * 2s 2s 1s He2 1s He (2s) L11-4 2002 A.Pines,M.Kubinec,UCB Sigma, Pi bonding Order Type B2 1 C2 2 N2 3 O2 2 F2 1 Ne2 0 + + * * y x 2pz 2px 2py x y L13-8 * * 2px 2py * * L19-1 L13-9 * 2pz A.Pines,M.Kubinec,UCB 2003 M.Kubinec,UC Regents A.Pines,M.Kubinec,UCB ChemQuiz 18.3 Consider ionization and electron capture in N2. Which is true of the bond strengths of the products? N N e- N N - e- N 1) N2 > N2 + - N+ - 2) N2 ~ N2 + - 3) N2 < N2 L19-2 + 2003 M.Kubinec,UC Regents ChemQuiz 18.4 Which process involving a photon is responsible for the conversion of O2 triplet to O2 singlet ? O2 (triplet) paramagnetic O2 (singlet) diamagnetic 1) absorption 2) emission 2003 M.Kubinec,UC Regents 3) ionization L19-4 M.Kubinec, H.Nitsche, UCB 1 L19: "Hybridization MOs, Resonance" Molecular Orbitals: Polyatomics Orbitals: C sp Hybrid orbitals sp Summary 2 180 3 120 Steric Number Bond Angle Hybridization C sp2 sp3 L18-14 C UC Regents 4 109 one s orbital one p orbital 2004 M.Kubinec, A. Pines two sp orbitals L18-6 sp3 Hybrid orbitals Multiple bonds two py form and * bond: sp2 + s bond: bond: py + py bond: H C H C H H bond: sp2 + sp2 bond: UC Regents 2003 M.Kubinec,UC Regents one s orbital three p orbitals four sp3 orbitals Steric Number 4 Bond Angle 109 two sp2 form and * L18-13 UC Regents L19-6 L18-17 Molecular Orbitals: Polyatomics Steric Number Bond Angle Examples acetylene C 2 180 180 C 3 120 120 graphite C 4 109 109 diamond, polyethylene L19-7 2003 M.Kubinec,UC Regents sp Hybrid orbitals one s orbital one p orbital 2003 M.Kubinec,UC Regents two sp orbitals L19-8 M.Kubinec, H.Nitsche, UCB 2 L19: "Hybridization MOs, Resonance" sp Hybrid orbitals one s orbital one p orbital two sp orbitals Steric Number Bond Angle 2 180 180 L19-9 2003 M.Kubinec,UC Regents sp2 Hybrid orbitals one s orbital two p orbitals 2003 M.Kubinec,UC Regents three sp2 orbitals L19-10 sp2 Hybrid orbitals one s orbital two p orbitals 2003 M.Kubinec,UC Regents three sp2 orbitals Steric Number 3 Bond Angle 120 120 L19-11 M.Kubinec, H.Nitsche, UCB 3 L19: "Hybridization MOs, Resonance" sp3 Hybrid orbitals one s orbital three p orbitals 2003 M.Kubinec,UC Regents four sp3 orbitals L19-12 sp3 Hybrid orbitals one s orbital three p orbitals 2003 M.Kubinec,UC Regents Steric Number four sp3 orbitals 4 Bond Angle 109 109 L19-13 Molecular Orbitals: Polyatomics Steric Number Bond Angle Hybridization C 2 180 180 sp sp2 sp3 L19-14 C 3 120 120 C 4 109 109 2003 M.Kubinec,UC Regents M.Kubinec, H.Nitsche, UCB 4 L19: "Hybridization MOs, Resonance" ChemQuiz 19.1 What is the hybridization of the C orbitals in C6H6? benzene 1) sp 2003 M.Kubinec,UC Regents 2) sp2 3) sp3 L19-15 Multiple bonds two py form and * bond: sp2 + s bond: bond: py + py bond: H C H C H H bond: sp2 + sp2 bond: two sp2 form and * 2003 M.Kubinec,UC Regents L19-17 ChemQuiz 19.2 What atomic orbitals make up the bonding MO shown? H Lactic Acid H C H H C O H O C O H 1) spC + spO 2003 M.Kubinec,UC Regents 2) pzC + pzO 3) sp2C + sp3O L19-18 M.Kubinec, H.Nitsche, UCB 5 L19: "Hybridization MOs, Resonance" ChemQuiz 19.3 How does the total number of , bonds change in hydrogenation of formaldehyde to methanol ? H2CO + H2 1) increase 2003 M.Kubinec,UC Regents H3COH 3) decrease L19-20 2) same (a) sp-hybridized Nitrogen Atom sp(b) Sigma Bond in the N2 Molecule (c) The two pi Bonds in N2 2003 M.Kubinec,UC Regents L19-22 d-Orbital Hybridization Shape SN: 5 Hybrids Orbitals 90 90 Examples dsp3 trigonal bipyramidal 120 120 SN: 6 d2sp3 d sp octahedral 2003 M.Kubinec,UC Regents 90 90 F F S F 90 90 F F .. F F Xe F F .. F L19-23 M.Kubinec, H.Nitsche, UCB 6 L19: "Hybridization MOs, Resonance" Sigma-bonding in Benzene 2003 M.Kubinec,UC Regents L19-24 MO System in Benzene is Formed by Combining Six p orbitals 2003 M.Kubinec,UC Regents L19-25 Multiple bonds: Polyatomics, Resonance Delocalization of electrons ~ Resonance 2003 M.Kubinec,UC Regents L19-26 M.Kubinec, H.Nitsche, UCB 7 L19: "Hybridization MOs, Resonance" ChemQuiz 19.4 Which molecular orbital in benzene formed from the atomic orbitals shown has the highest energy? energy? 1) 2) 3) L19-27 2003 M.Kubinec,UC Regents Lecture Complete 2003 M.Kubinec,UC Regents L19-29 ChemQuiz 18.1 Formaldehyde is planar. planar. Which best describes the electron density? density? C::O ::O H : : H 1) 2003 M.Kubinec,UC Regents 2) 3) L19-30 M.Kubinec, H.Nitsche, UCB : : 8 L19: "Hybridization MOs, Resonance" ChemQuiz 18.1 Solution H H 1) 2003 M.Kubinec,UC Regents : : : : C::O ::O HH C O 2) 3) L19-31 Molecular Orbitals: Polyatomics Orbitals: C sp3 Hybrid orbitals sp Summary 2 180 3 120 Steric Number Bond Angle Hybridization C sp2 sp3 L18-14 C UC Regents 4 109 one s orbital three p orbitals UC Regents Steric Number four sp3 orbitals 4 Bond Angle 109 L18-13 Multiple bonds two py form and * bond: sp2 + s bond: bond: py + py bond: Multiple bonds: Polyatomics, Resonance H C H C H H bond: sp2 + sp2 bond: two sp2 form and * Delocalization of electrons ~ Resonance UC Regents 2003 M.Kubinec,UC Regents L18-17 UC Regents L19-32 L18-20 Effective Pairs, Spatial Arrangement, and Hybrid Orbital Sets 2 3 Linear sp Trigonal sp2 planar 4 2003 M.Kubinec,UC Regents Tetrahedral sp3 L19-33 M.Kubinec, H.Nitsche, UCB 9 L19: "Hybridization MOs, Resonance" dsp3 Orbitals to Form bonds in PCl5 Molecule dsp3 Trigonal bypyramidal 2003 M.Kubinec,UC Regents L19-34 Octahedral d2sp3 Orbitals on a Xenon Atom d2sp3 AO Xe 2003 M.Kubinec,UC Regents L19-35 ChemQuiz 19.5 Which is the energy diagram for the phosphorous hybrid atomic orbitals in PCl5 after hybridization? hybridization? 1) 2003 M.Kubinec,UC Regents 3d 3p 3s 2) 3) L19-36 M.Kubinec, H.Nitsche, UCB 10 L19: "Hybridization MOs, Resonance" PCl5 ChemQuiz 19.5 Solution SN: 5 dsp3 hybridization 3d dsp3 dsp3 dsp3 dsp3 dsp3 s + p + p + p + d = 5 equivalent dsp3 orbitals standard atomic orbitals 3d 3p 3s 1) 2003 M.Kubinec,UC Regents 2) 3) L19-37 The p orbitals used to form the bonding system in the NO3- ion 2003 M.Kubinec,UC Regents L19-38 M.Kubinec, H.Nitsche, UCB 11 ...
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This note was uploaded on 08/19/2009 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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