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Unformatted text preview: chauhan (mmc2762) Mar 1 HW sparks (51150) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Preview sections 5.1 and 5.2 before next class. 001 10.0 points According to molecular orbital theory, which of the following is NOT predicted to exist? 1. All are predicted to exist 2. He 2 correct 3. He 2- 4. He 2+ 5. He Explanation: When the bond order is equal to 0, a molecule is predicted to not exist. B . O . = bonding e-- antibonding e- 2 For He 2 , the number of bonding electrons (2) equals the number of antibonding elec- trons, therefore the bond order is 0 and the molecule is predicted to not exist. 002 10.0 points Which of the following is diamagnetic? 1. N 2- 2 2. N 2 correct 3. N- 2 4. N + 2 Explanation: All but N 2 are paramagentic (possess un- paired electrons). 003 10.0 points Which molecule would you predict would be more stable: F 2- 2 or F + 2 ?...
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This note was uploaded on 04/03/2012 for the course CHEM 56920 taught by Professor Sparks during the Spring '12 term at University of Texas at Austin.
- Spring '12