Chem301 - Exam 2 - Version 026 Exam 2 mccord (50970) 1 This...

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Unformatted text preview: Version 026 Exam 2 mccord (50970) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. McCord CH301 001 10.0 points What hybridization would you expect for the carbon atoms in the cyclic compound benzene (C 6 H 6 )? 1. sp 3 d 2 2. sp 2 correct 3. sp 3 4. sp 3 d 5. sp Explanation: In each carbon one s orbital and two p or- bitals hybridize to produce three sp 2 orbitals which form sigma bonds between the carbons and between carbon and hydrogen. The re- maining p orbitals form pi bonds between the carbons. 002 10.0 points Draw the Lewis structure for CO. 1. b b b b b b O b b b b b b O C 2. b b b b b b O b b b b C 3. O b b b b b b b b C 4. b b b b b b b b O b b b b b b b b C 5. b b b b b b O b b b b b b C 6. b b b b b b b b b b O C correct 7. O b b b b b b b b b b C 8. O b b b b b b b b b b C 9. b b b b b b O b b b b b b C 10. O b b C Explanation: C has 4 valence electrons; O has 6: b b b b C b b b b b b O Total number of valence electrons: C 1 4 e = 4 e O 1 6 e = 6 e 10 e b b b b b b b b b b O C or b b b b O C This configuration gives each atom a com- plete octet. 003 10.0 points Which of the following has bond angles of exactly 120 ? 1. NO 2 2. CS 2 3 correct 3. S 2 3 4. O 3 5. HO 2 Explanation: While CS 2 3 and NO 2 both have three re- gions of electron density around the central atom, in NO 2 one of these regions is a lone pair which will repel the other regions more strongly, making the bond angle less than 120 . Only in CS 2 3 would the bond angle be exactly 120 . 004 10.0 points ICl 3 is sp 3 d hybridized. What is the electronic and molecular geometry? 1. trigonal bipyramidal, seesaw 2. trigonal bipyramidal; T-shaped correct Version 026 Exam 2 mccord (50970) 2 3. tetrahedral; pyramidal 4. trigonal planar; trigonal planar 5. octahedral; T-shaped Explanation: The hybridization tells us that there are 5 regions of high electron density. Three of those regions are the bonded Cl atoms. The other two regions must be lone pairs of elec- trons on the central I atom. This corresponds to trigonal bipyramidal electronic geometry and T-shaped molecular geometry. 005 10.0 points What is the molecular geometry of SbCl 2 5 ? Antimony (Sb) can be an exception to the octet rule, accepting up to twelve electrons. 1. square pyramidal correct 2. square planar 3. trigonal bipyramidal 4. octahedral 5. seesaw Explanation: 006 10.0 points What is the electronic geometry around ni- trogen in the molecule CH 3 CH 2 NH 2 ? 1. trigonal pyramidal 2. trigonal planar 3. linear 4. bent 5. tetrahedral correct 6. square planar Explanation: 007 10.0 points Which of the following elements would be ex- pected to have the highest electronegativity?...
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Chem301 - Exam 2 - Version 026 Exam 2 mccord (50970) 1 This...

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