11 - CHEMISTRY 121 Problem Set 11 Answers 1. Molecular...

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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 11 Answers Molecular Orbital Theory 1. When atomic orbitals combine to form molecular orbitals, the number of molecular orbitals formed is: (a) equal to the number of atomic orbitals (b) twice the number of atomic orbitals (c) half the number of atomic orbitals (d) not determined by the number of atomic orbitals (e) none of the above The answer is: A 2. Which combination of atomic orbitals would result in the following molecular orbital? Sketch the atomic orbitals involved and be sure to show phases (+ or -) Answer: The MO in question is a σ 2p orbital resulting from the overlap of two 2p z orbitals. 3. The compound sodium peroxide (Na 2 O 2 ) is an industrial bleaching agent for fabrics and paper products. This important industrial chemical contains the peroxide ion, (O 2 ) 2– . (a) Give the full molecular orbital configuration for the peroxide ion. O 2 2- has a total of 2(8) + 2 = 18 electrons. The full molecular orbital configuration is: ( σ 1s ) 2 ( σ * 1s ) 2 ( σ 2s ) 2 ( σ * 2s ) 2 ( σ 2p ) 2 ( π 2p ) 4 ( π * 2p ) 4 (b) What is the oxygen-oxygen bond order in the (O 2 ) 2– ion? The bond order (B.O.) is defined as: B.O. = 1/2 × (# electrons in bonding MOs - # electrons in anti-bonding MOs) B.O. (O 2 ) 2- = 1/2 × (10 - 8) = 1.
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CHEMISTRY 121 2 Department of Chemistry University of British Columbia 4. The E region of the ionosphere is 50-90 miles above the surface of the earth. This region of the earth's atmosphere has been probed by means of satellites. A variety of positive ions listed below have been detected and identified. Which one(s) will be the most stable to dissociation?
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This note was uploaded on 11/03/2009 for the course ECON 210 taught by Professor James during the Spring '09 term at UBC.

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11 - CHEMISTRY 121 Problem Set 11 Answers 1. Molecular...

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