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chem102-2b - Chem 102 lec 2b W11 Last time 1 review VSEPR...

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Chem 102 lec 2b W’11 Last time: 1) review VSEPR and molecular geometry 2) hybridization 3) sigma and pi bonds Today: 1) review of sigma and pi bonds 2) molecular polarity 3) noncovalent intermolec. Interactions Lecture 2b: (1) Remember: electron domain hybridization linear sp trigonal planar sp 2 tetrahedral sp 3 bipyramidal sp 3 d octahedral sp 3 d 2 Consider C 2 H 2 . Draw lewis structure, determine hybridization, Draw the molec orbitals. Can molecular orbitals be excited? (2) Intermolecular interactions: 1) intermolecular interactions 2) hydrophillic vs hydrophobic molecules 3) biomolecules 4) chapter 10: pressure, the atmosphere. Kinds of intermolecular interactions: ion-ion (Coulomb’s Law electrostatic attraction) 1/r 2 dependence London forces (dispersion forces; induced dipole-induced dipole) dipole-dipole
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van der Waals H-bonding Some points to consider: (1) Intermolecular forces are weak; but without them, life as we know it would be impossible: e.g. Water condensation and freezing to ice.
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