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12 - Lecture 12(done after lecture 13 14 in fall 2011...

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1 Lecture 12 (done after lecture 13 & 14 in fall 2011) Valence Bond Theory and Hybridization Reading 11.1 and 11.2
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2 This Week in Chemistry Attend lecture and recitation Homework due on Friday Enthalpy of Solutions lab
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3 Enthalpy of Solution Lab Is Formation of a Solution Accompanied by Evolution or Absorption of Heat? Chapter 5 in the lab manual (prelab on pp. 33-34) Read Section 6.3 in the textbook: Calorimetry
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4 You must wear your goggles in lab AT ALL TIMES , including while writing the report. Lab Safety - Goggles If you take your goggles off in lab, you will receive no credit for the lab.
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5 Theories of Covalent Bonding Valence Bond Theory How do we explain the shapes of molecules based upon the interaction of atomic orbitals? Big idea! Hybridization – the mixing of atomic orbitals . Often used in organic chemistry Accounts for shapes of molecules.
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6 The Central Themes of VB Theory Basic Principle A covalent bond forms when the orbitals of two atoms overlap and are occupied by a pair of electrons that have the highest probability of being located between the nuclei. Themes A set of overlapping orbitals has a maximum of two electrons that must have opposite spins . The greater the orbital overlap, the stronger (more stable) the bond. Maximum overlap of bonding orbitals.
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