TA practice exam 2

TA practice exam 2 - CH301 Fall 2010 Practice Exam 2TA...

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CH301 Fall 2010 Practice Exam 2—TA Style 1. Which of the following bonds is most polar? (Hint: you only need knowledge of the electronegativity trend, you don’t need to know actual values.) 1. Br-Cl 2. F-I 3. I-Cl 4. F-Cl 5. Br-F 6. I-Br 2. If a molecule has 3 identical atoms bonded to its central atom, how many non-bonding pairs of electrons must be on the central atom in order to be non-polar? 1. 3 2. 2 3. 1 4. 0 5. Two of these answers would make the molecule non-polar. 3 If a molecule has 2 non-bonding electron pairs on its central atom, how many identical atoms must be bonded to the central atom in order to be polar? 1. 4 2. 3 3. 2 4. 4 or 3 5. 4 or 2 6. 3 or 2 7. 4, 3, or 2 4. In the correct Lewis structure for XeF 4 , what bond angle(s) exist(s)? 1. 180° 2. 90° 3. 120° 4. 180° and 90° 5. 180°, 90° and 120° 5. Valence Bond Theory is required to explain which of the following? 1. The degeneracy of non-bonding electrons found in molecule such as F 2 . 2. The bond angles observed around central atoms. 3. The degeneracy of bonds found in molecules such as CH 4 . 4. The bond angles observed around terminal atoms. 6. What is the electronic geometry of BrF 3 ? 1. linear 2. trigonal planar 3. tetrahedral 4. trigonal bipyramidal 5. octohedral
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7. What is the molecular geometry of XeOF 4 ? 1. square pyramidal 2. octohedral 3. trigonal bipyramidal 4. square planar 8. How many σ (sigma) and π (pi) bonds are in the molecule adenine? 1. 10 σ and 8 π 2. 14 σ and 4 π 3. 12 σ and 4 π 4. 8 σ and 8 π 9. All of the carbon-carbon bonds in the molecule adenine are. .. 1. σ sp2,sp2 & π sp2,sp2 2. σ 2s,sp2 & π sp2,2p 3. σ 2s,sp2 & π 2s,2s 4. σ sp2,sp2 & π 2p,2p 5. σ sp2,sp2 & σ 2s,sp2 6. π sp2,sp2 & π 2p,2p 10. If you took the valence p orbitals from a two oxygen (O) atoms and used them to form molecular orbitals, you would generate ___ total π orbitals, ___ total σ orbitals and ___ of these would be anti-bonding orbitals. 1. 4, 2, 3
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TA practice exam 2 - CH301 Fall 2010 Practice Exam 2TA...

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