CAS CH 203 Lecture Notes - Lecture 14: Valence Bond Theory, Atomic Orbital, Pi Bond
Document Summary
Readings for today: sections 3. 4, 3. 5, 3. 6 and 3. 7 (same sections in 4th and 5th ed) . Read for lecture #16: sections 6. 13, 6. 15, 6. 16, 6. 17, 6. 18, and 6. 20 (same sections in 4th and 5th ed) the enthalpy of chemical change. Wednesday, october 8, 2014: sp3 hybridization, sp2 hybridization, sp hybridization, sigma and pi bonds, hybridization of atomic orbitals. Topics: i. valence bond theory and hybridization: valence bond theory and hybridization. In valence bond theory, bonds result from the pairing of unpaired electrons in atomic orbitals: sigma and pi bonds. (sigma) bond: cylindrically symmetric with nodal plane across the bond axis. (pi) bond: a bond with e- density in two lobes, one on each side of the bond axis. H! 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 -bond plus one triple bond: one -bond plus. Bonds: hybridization of atomic orbitals, sp3 hybridization.
