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Chem. 212 – Molecular Structures and Geometries

Chem. 212 – Molecular Structures and Geometries. Hand in to TA : VSEPR-Pre-lab; Solubility Report, GCF’s. Pick up one Model Kit per group. Hybridization of carbon Follow Sequence of: Lewis -> AXE -> VSEPR Follow format (see later slide) methane ethane vs. ethene vs. ethyne

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Chem. 212 – Molecular Structures and Geometries

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  1. Chem. 212 – Molecular Structures and Geometries Hand in to TA: VSEPR-Pre-lab; Solubility Report, GCF’s. • Pick up one Model Kit per group. • Hybridization of carbon • Follow Sequence of: Lewis -> AXE -> VSEPR • Follow format (see later slide) • methane • ethane vs. ethene vs. ethyne • Lab report due next week: (Tue-Group next Tue 9:30 am); (Wed-Group next Wed 2:00 pm); (Fri-Group next Thu 12:00 nn). CyberChem (VSEPR) video

  2. Hybridization of Carbon Free Carbon Bonding in Carbon 2p E 2s Four Equivalent sp3 Hybridized Orbitals (Tetrahedral) • Methane • Ethane versus Ethene (Geometrical Isomers) • Ethyne • Bromochloroiodomethane (Stereoisomers)

  3. Drawing Lewis Structures Follow Step by Step Method (See Ng Web-site) • Total all valence electrons. [Consider Charge] • Write symbols for the atoms and guess skeleton structure [ define a central atom ]. • Place a pair of electrons in each bond. • Complete octets of surrounding atoms. [ H = 2 only ] • Place leftover electrons in pairs on the central atom. • If there are not enough electrons to give the central atom an octet, look for multiple bonds by transferring electrons until each atom has eight electrons around it. HyperChem CyberChem video

  4. Summary of VSEPR Molecular Shapes HyperChem CyberChem video See Ng Web-site

  5. Lewis/AXE/VSEPR Format

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