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TA practice quiz 4 key - CH301 Fall 2010 Practice Quiz...

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CH301 Fall 2010 Practice Quiz 4—Answer Key 1. When N 2 + ionizes (gains 2 electrons) to form N 2 - , its bond order would... 1. change from 2.5 to 3.5 2. change from 2.5 to 3 3. not change 4. change from 3 to 2 5. change from 3.5 to 2.5 The bond order of N 2 + is 2.5 and of N 2 - is 3.5. 2. Which of the species below is paramagnetic? I. O 2 + II. O 2 III. O 2 - 1. I 2. II 3. III 4. I and II 5. I and III 6. II and III 7. I, II and III All the species have at least one unpaired electron, specifically in π * 2p orbitals. 3. Based on simple bond order arguments, which two of the species below would be most similar in bond length? I. H 2 II. B 2 - III. C 2 IV. F 2 + 1. I and II 2. I and III 3. I and IV 4. II and III 5. II and IV 6. III and IV Both B 2 - and F 2 + have a bond order of 1.5, and so they’ll have similar bond lengths. 4. Which of the following species has the fewest delocalized electrons? 1. carbonate (CO 3 2- ) 2. phosphate (PO 4 3- ) 3. sulfur dioxide (SO 2 ) 4. benzene (C 6 H 6 ) All of the species have at least one delocalized pair except for sulfur dioxode.
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5. Consider the reaction below:
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