HW04-solutions-QUY - arriaga (yga77) HW04 quy (50970) 1...

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Unformatted text preview: arriaga (yga77) HW04 quy (50970) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of the following is the correct Lewis formula for oxygen (O 2 )? 1. O b b b b b b b b b b O 2. b b b b b b b b b b O O 3. O b b O 4. b b b b b b O b b b b b b O 5. O b b b b b b b b O 6. b b b b b b O b b b b O 7. b b b b b b b b O b b b b b b b b O 8. b b b b b b O b b b b b b O correct Explanation: N = 8 2 = 16 A = 6 2 = 12 S = N- A = 16- 12 = 4 There are 4 shared electrons. The remain- ing electrons are placed around the oxygen atoms such that each has an octet. The Lewis dot formula for oxygen (O 2 ) is b b b b b b O b b b b b b O 002 10.0 points How many lone pairs of electrons are on nitrogen in NF 3 ? 1. one correct 2. three 3. two 4. twenty 5. four 6. ten 7. none 8. thirteen Explanation: The Lewis structure is N b b F b b b b b b F b b b b b b F b b b b b b 003 10.0 points How many unshared electrons and bonding electrons exist around the central atom in ozone, O 3 ? 1. two; six correct 2. three; six 3. one; six 4. none; two 5. zero; eight 6. one; three 7. two; two 8. four; three 9. four; four Explanation: O b b O b b b b b b O b b b b O b b O b b b b b b O b b b b 004 10.0 points Which of the following is the correct Lewis formula for acetylene (ethyne, C 2 H 2 )? 1. b b b b b b H C C H arriaga (yga77) HW04 quy (50970) 2 2. H C C b b b b H 3. b b b b b b b b H C C H 4. H b b b b b b C C b b b b H b b b b b b 5. b b b b b b b b b b b b H C C H 6. b b b b b b b b b b b b b b b b b b b b H C C H 7. C C H H b b b b b b b b b b 8. b b b b b b b b b b b b b b H C C H 9. H C C H correct 10. b b b b b b b b b b b b b b b b b b H C C H Explanation: The Lewis formula for acetylene (ethyne, C 2 H 2 ) is H C C H 005 10.0 points Which of the following is the correct Lewis formula for chlorine fluoride (ClF)? 1. b b b b F b b b b b b Cl 2. F b b b b b b Cl 3. b b b b b b b b F Cl 4. F b b b b b b b b Cl 5. b b b b F b b b b b b Cl 6. F Cl 7. b b b b b b b b F Cl 8. F b b b b b b b b Cl 9. b b b b F Cl 10. b b b b b b F b b b b b b Cl correct Explanation: The Lewis formula for chlorine fluoride (ClF) is b b b b b b F b b b b b b Cl 006 10.0 points Which of the following contains exactly one unshared pair of valence electrons? 1. C 2 H 4 2. NaCl 3. SiH 4 4. H 2 S 5. PH 3 correct Explanation: The PH 3 molecule contains exactly 1 un- shared pair of valence electrons: P H H H arriaga (yga77) HW04 quy (50970) 3 You can check this structure for correctness by verifying that each atom has the correct...
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This note was uploaded on 01/30/2012 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas at Austin.

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HW04-solutions-QUY - arriaga (yga77) HW04 quy (50970) 1...

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