TA practice quiz 3

TA practice quiz 3 - 1 bent trigonal pyramidal t-shaped 2...

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CH301 Fall 2010 Practice Quiz 3 1.How many polar ionic, polar covalent and non-polar covalent bonds are present in the Lewis structure for BF 2 BNH 2 ? Base your answer on simple EN considerations. (Hint: the molecule is drawn much as it is written.) 1. 0; 6; 0 2. 0; 3; 3 3. 2; 3; 1 4. 2; 4; 0 5. 0; 5; 1 2. In the Lewis structure for dimethylamine (CH 3 NHCH 3 ), what are the approximate bond angles, hybridization and electronic geometry of the nitrogen atom? (Hint: the molecule is drawn much as it is written.) 1. 90°, sp 3 , tetrahedral 2. 109.5°, sp 2 , trigonal planar 3. 120°, sp 2 , trigonal planar 4. 180°, sp , linear 5. 109.5°, sp 3 , tetrahedral 3. Of the following choices, which has a molecule paired incorrectly with either its bond angle(s), electronic geometry, or hybridization? 1. CO 2 , 180° 2. SiH 4 , tetrahedral 3. NH 4 + , 109.5° 4. SCl 6 , sp 3 d 2 5. XeF 2 , linear 6. BF 3 , sp 2 4. What are the molecular geometries of the labeled atoms (in order: a, b, c) in the Lewis structure below? Note: only bonding electrons are shown.
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Unformatted text preview: 1. bent; trigonal pyramidal; t-shaped 2. bent; tetrahedral; t-shaped 3. trigonal planar; bent; tetrahedral 4. trigonal pyramidal; linear; see-saw 5. trigonal planar; linear; trigonal bipyramidal 5. Which of the following molecules is/are polar? 1. I only 2. III only 3. II, III 4. II only 5. I, III 6. I, II, III 7. I, II 6. The Lewis structure for benzene (C 6 H 6 ) has how many σ and how many π bonds? 1. 9; 6 2. 6; 3 3. 12; 3 4. 12; 0 5. 15; 0 7. Which of the following statements concerning hybrid orbitals is/are true? I) Hybrid orbitals are energetically degenerate. II) Any element can form sp 3 d 2 hybrid orbitals. III) Hybridizing a 2s and a 2p orbital would produce a single sp hybrid orbital. 1. I only 2. I, III 3. II, III 4. II only 5. I, II 6. I, II, III 7. III only 8. What orbitals were used to form the π bond in the thionoester molecule below? 1. sp 2 , 3s 2. 2p , 3p 3. sp 3 , 3s 4. 2s , 3p 5. sp 3 , 3p...
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This note was uploaded on 10/10/2011 for the course CH 50995 taught by Professor Laude during the Fall '10 term at University of Texas.

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TA practice quiz 3 - 1 bent trigonal pyramidal t-shaped 2...

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