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HW7 - Lin(cgl286 Homework 7 Lyon(52370 This print-out...

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Lin (cgl286) – Homework 7 – Lyon – (52370) 1 This print-out should have 43 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This HW assignment is due Tuesday, March 31, by 11PM. 001 10.0 points Consider the following molecular orbital di- agram: a b c What are the names of the labeled orbitals, a through c, respectively? 1. σ * 2 p , π 2 p , σ 2 s correct 2. σ 2 p , σ * 2 p , σ * 2 s 3. σ * 2 p , π 2 p , σ * 2 s 4. σ * 2 p , π 2 p , σ * 1 s 5. π 2 p , σ * 2 p , σ * 2 s Explanation: 002 10.0 points Which of the following statements concerning molecular orbital theory is/are true? I) Bonding orbitals are lower in energy than their corresponding anti-bonding orbitals. II) Removing electrons from anti-bonding orbitals destabilizes molecules. III) Unlike filling atomic orbitals, filling molecular orbitals doesn’t obey the auf- bau principle. 1. III only 2. I, III 3. II, III 4. II only 5. I, II 6. I only correct 7. I, II, III Explanation: Statement II is false because removing elec- trons from anti-bonding orbitals would actu- ally increase the bond order of the molecule, thereby stabilizing it. Statement III is false, because molecular orbitals are filled from low- est to highest energy according to the aufbau principle just like atomic orbitals. 003 10.0 points Which of the following is TRUE about non- bonding orbitals of the molecular orbital the- ory? 1. Nonbonding orbitals are made from the overlap of bonding and antibonding orbitals. 2. Nonbonding orbitals do not overlap other atomic orbitals. correct 3. Shared electrons are placed in nonbonding orbitals. 4. Nonbonding orbitals give added stability to the molecule. 5. Nonbonding orbitals are higher in energy than their corresponding bonding orbitals. Explanation: Nonbonding orbitals maintain the charac- teristics of the original atomic orbitals. They are not molecular orbitals and do not arise from the overlapping of atomic orbitals. 004 10.0 points
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Lin (cgl286) – Homework 7 – Lyon – (52370) 2 Using molecular orbital theory, determine the bond order for O 2 - ? 1. 2 2. 3 3. 2.5 4. 1 5. 1.5 correct Explanation: The molecule would have 17 total electrons, 10 of which would be bonding and 7 of which would be anti-bonding. Therefore the bond order would be: (10 - 7) / 2 = 1 . 5. 005 10.0 points Which of the following statements is true about a molecule with a bond order of one? 1. The molecule has no electrons in anti- bonding orbitals. 2. The molecule has a single bond. correct 3. The molecule is as stable as molecules with bond orders of two and three. 4. Two side-by-side p orbitals combine to form pi bond and pi antibond orbitals; there- fore the bond order is 1. Explanation: The bond order corresponds to the number of bonds between two atoms. 006 10.0 points An antibonding orbital is formed when 1. None of these is correct.
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