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quiz10key - 5 Which orbitals are bonding antibonding and...

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CHEMISTRY 131 Quiz #10 Due: Wednesday, April 19, 2006 Name: _____________________________________ Shown below is a partially completed MO diagram for CO 3 -2 . The diagram makes the assumption that the 2s orbitals on O are too low in energy to interact with any other orbitals on the diagram. 1. Draw the 3D structure of the molecule and assign its point group. 2. What are the symmetries of the orbitals on the central atom (C)? 3. What are the symmetries of the groups of p orbitals on the terminal atoms? 4. Assign the symmetries of the molecular orbitals in the middle of the diagram and use dashed lines to connect them to the appropriate atomic orbitals (i.e., the atomic orbitals with the same symmetry).
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Unformatted text preview: 5. Which orbitals are bonding, antibonding, and nonbonding? How many bonds and lone pairs are indicated by the diagram, and how does this information compare with the Lewis dot structure? C CO 3-2 3 O a 1 ' +a 2 '+ 2e' + a 2 " +e" a 1 ' a 2 " + e' 1a 1 ' 2a 1 ' 1a 2 " 2a 2 " 1e' 2e' 3e' 1a 2 '+1e" (12 electrons) (6 electrons) (24 electrons) bonding MO: 1a 1 ' , 1a 2 " , 1e' antibonding MO: 2a 1 ' , 3e' , 2a 2 " lone pairs: (O 2s), 1a 2 ', 1e", 2e' C: 3O: chg: 4 e 18 e 2 e 24 e 6 e 18 e 1 8 e C O O O-2 C O O O-2 D 3h The diagram indicates a total of 4 bonds (bonding orbitals) and 8 lone pairs (nonbonding orbitals), as with the VSEPR structure....
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