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Unformatted text preview: maldonado (om2892) – ch 14 and 5 practice – hoener – (53115) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. THIS IS A REVIEW OPPORTUNITY ONLY - IT IS NOT HOMEWORK, CAN NOT AND WILL NOT BE USED TOWARD YOUR COURSE GRADE OR BONUS POINTS! OF ANY KIND! (It is an old exam from my other section made into a review opportunity.) 001 10.0 points Draw the dot formula for the HNO 2 molecule. The nitrogen atom is the central atom and the hydrogen atom is attached to an oxygen atom. On the basis of the number of regions of high electron density about the nitrogen atom, predict the hybridization at the nitro- gen atom. 1. sp 2. sp 3 d 2 3. sp 3 4. sp 2 correct 5. sp 3 d Explanation: 002 10.0 points How many σ (sigma) and how many π (pi) bonds are there in the Lewis structure of the following organic molecule? C C H H C O b b b b O b b b b H C C H 1. 6; 4 2. 10; 6 3. 10; 4 correct 4. 14; 0 5. 12; 0 Explanation: 003 10.0 points What is the hybridization of carbon in CH 3 Cl? 1. sp 3 correct 2. sp 3. sp 3 d 4. sp 2 5. sp 3 d 2 Explanation: 004 10.0 points s p p p ??? p The hybridized orbital marked ??? is of what type? 1. sp 3 2. sp 3 d 3. sp 4. sp 2 correct Explanation: To make the hybrid orbital, the s orbital and only 2 of the 3 available p orbitals were hybridized, as evidenced by the fact that one of the p orbitals appears not to have been hybridized. The hybrid orbital thus produced would be sp 2 . 005 10.0 points Rank the following species from strongest to weakest bonds based on bond order: O 2 , N + 2 , maldonado (om2892) – ch 14 and 5 practice – hoener – (53115) 2 H − 2 , Li 2 , C 2 − 2 . 1. N + 2 > C 2 − 2 > O 2 > Li 2 > H − 2 2. C 2 − 2 > N + 2 > O 2 > H − 2 > Li 2 3. N + 2 > O 2 > C 2 − 2 > Li 2 > H − 2 4. N + 2 > O 2 > C 2 − 2 > H − 2 > Li 2 5. C 2 − 2 > N + 2 > O 2 > Li 2 > H − 2 correct Explanation: The species O 2 , N + 2 , H − 2 , Li 2 and C 2 − 2 have bond orders of 2, 2.5, 0.5, 1 and 3 respectively. 006 10.0 points Which of the following is TRUE about non- bonding orbitals of the molecular orbital the- ory? 1. Nonbonding orbitals do not overlap other atomic orbitals. correct 2. Nonbonding orbitals give added stability to the molecule. 3. Shared electrons are placed in nonbonding orbitals. 4. Nonbonding orbitals are higher in energy than their corresponding bonding orbitals. 5. Nonbonding orbitals are made from the overlap of bonding and antibonding 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....
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This note was uploaded on 04/01/2011 for the course EM 306 taught by Professor Rodin during the Spring '07 term at University of Texas.

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solution_pdf - maldonado (om2892) – ch 14 and 5 practice...

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