hw9_explained - padilla (tp5647) HW09: MO Theory shear...

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Unformatted text preview: padilla (tp5647) HW09: MO Theory shear (52375) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Bonding orbitals 1. hold all valence electrons. 2. hold non-bonding electrons. 3. are lower in energy than anti-bonding orbitals correct 4. are less stable than anti-bonding or- bitals. 5. are filled after anti-bonding orbitals. Explanation: Bonding orbitals are lower in energy and more stable than anti-bonding orbitals. 002 10.0 points According to molecular orbital theory, which of the following is NOT predicted to exist? 1. He 2+ 2. He 3. He 2- 4. He 2 correct 5. All are predicted to exist Explanation: When the bond order is equal to 0, a molecule is predicted to not exist. B . O . = bonding e-- antibonding e- 2 For He 2 , the number of bonding electrons (2) equals the number of antibonding elec- trons, therefore the bond order is 0 and the molecule is predicted to not exist. 003 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. * 2 p , 2 p , 1 s 2. * 2 p , 2 p , * 1 s correct 3. 2 p , 2 p , * 1 s 4. 2 p , 2 p , 2 s 5. 2 p , 2 p , 2 s Explanation: 004 (part 1 of 2) 10.0 points What is the expected bond order for the diatomic species B- 2 ? 1. 2 2. 3 2 correct 3. 1 4. 4 5. 1 2 6. 3 Explanation: BO = 2 + 3- 2 2 = 3 2 padilla (tp5647) HW09: MO Theory shear (52375) 2 2 p * 2 p * 2 p 2 p 2 p 2 p 2 s * 2 s 2 s 2 s 005 (part 2 of 2) 10.0 points What is the magnetism and number of un- paired electrons of B- 2 ?...
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hw9_explained - padilla (tp5647) HW09: MO Theory shear...

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