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Chemical Bonding - PowerPoint PPT Presentation

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Chemical Bonding
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  1. Chemical Bonding Chpt. 4 of text

  2. Lewis Theory • We cannot “see” a chemical bond • Theoretical picture of a bond based on experiment

  3. Lewis Structures & Quantum Mechanics

  4. (Gr. 11 Review)

  5. Linus Pauling: Valence Bond Theory

  6. Water…

  7. Hybrid Orbitals • Problem: Experiment shows Methane (CH4) has 4 identical bonds, even though…

  8. Forms of Hybridization

  9. A sigma (σ) bond is created by the end-to-end overlap of atomic orbitals

  10. A pi (π) bond is created by the side-by-side (or parallel) overlap of atomic orbitals, usually p orbitals

  11. Double bonds and C2H4

  12. Triple Bondsand C2H2

  13. Bond Strengths

  14. VSEPR • Ronald Gillespie co-created VSEPR theory. He worked at McMaster in Hamilton. • VSEPR: valence-shell-electron-pair-repulsion theory (pronounced “vesper”)