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q4f08 - Version PREVIEW Quiz 4 JOHNSON(53755 This print-out...

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Version PREVIEW – Quiz 4 – JOHNSON – (53755) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. LDE Bond Order 001 001 5.0 points Using molecular orbital theory, determine the bond order for O 2 - ? 1. 1.5 correct 2. 1 3. 3 4. 2.5 5. 2 Explanation: The molecule would have 17 total electrons, 10 of which would be bonding and 7 of which would be anti-bonding. Therefore the bond order would be: (10 - 7) / 2 = 1 . 5. LDE Paramagnetism 001 002 5.0 points Which of the following species is not param- agnetic? 1. CN 2. N 2 3+ 3. F 2 - 4. OF 5. B 2 2 - correct Explanation: The answer choices F 2 - , OF, CN, and N 2 3+ all have an odd number of total electrons and therefore must be paramagnetic. LDE Ranking Bonding Trends 003 003 5.0 points Using molecular orbital theory, rank the fol- lowing species in terms of increasing bond length: O 2 , B 2 + , CN - , and F 2 . 1. B 2 + < O 2 < F 2 < CN - 2. CN - < F 2 < O 2 < B 2 + correct 3. CN - < B 2 + < O 2 < F 2 4. F 2 < CN - < O 2 < B 2 + 5. F 2 < O 2 < B 2 + < CN - Explanation: Bond order
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