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lecnotes15 - 5.111 Lecture Summary #15 Readings for today:...

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5.111 Lecture Summary #15 Readings for today: Sections 3.4, 3.5, 3.6 and 3.7 (Sections 3.4, 3.5, 3.6, 3.7, and 3.8 in 3 rd ed ) – Valence Bond Theory. Read for Lecture #16: Sections 6.13, 6.15, 6.16, 6.17, 6.18, and 6.20 (Sections 6.14, 6.16, 6.17, 6.18, 6.19, and 6.21 in 3 rd ed ) – The Enthalpy of Chemical Change. Assignment: Problem set #5 (due Friday, October 17 th at noon) _______________________________________________________________________________ Topics: Valence bond theory and hybridization I . Sigma and pi bonds II. Hybridization of atomic orbitals A . sp 3 hybridization B. sp 2 hybridization C. sp hybridization ________________________________________________________________________________ VALENCE BOND THEORY AND HYBRIDIZATION H 1s H 1s In valence bond theory , bonds result from the pairing of unpaired electrons in atomic orbitals. I. SIGMA AND PI BONDS σ (sigma) bond : cylindrically symmetric with ____ nodal plane across the bond axis. π (pi) bond : a bond with e - density in two lobes, one on each side of the bond axis. A pi bond has a _______________ nodal plane along the bond axis. We can describe multiple bonds according to valence-bond theory. single bond: ____________________ double bond: one σ - bond plus one ____________________ triple bond: one σ - bond plus ___________ π -bonds 1
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This note was uploaded on 03/02/2012 for the course CHEM 5111 taught by Professor Vogel during the Fall '08 term at MIT.

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lecnotes15 - 5.111 Lecture Summary #15 Readings for today:...

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