exam 2 spring 2007 - Kolar, Leah Exam 2 Due: Mar 7 2007,...

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Unformatted text preview: Kolar, Leah Exam 2 Due: Mar 7 2007, noon Inst: McCord 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which of the following pairs of ions would have the greatest coulombic attraction in a solid compound? 1. Mg 2+ , Se 2- 2. Mg 2+ , O 2- correct 3. Mg 2+ , S 2- Explanation: E 1 r , so the ion with the shortest radius will have the greatest coulombic attraction. 002 (part 1 of 2) 10 points What is the expected bond order for the diatomic species B 2 ? 1. 2 2. 3 2 3. 3 4. 4 5. 1 2 6. 1 correct Explanation: BO = 2- 2 = 1 or BO = 2 + 2- 2 2 = 1 2 p * 2 p * 2 p 2 p 2 p 2 p 2 s * 2 s 2 s 2 s 003 (part 2 of 2) 10 points What is the magnetism and number of un- paired electrons of B 2 ? 1. diamagnetic 2. paramagnetic; 3 3. paramagnetic; 2 correct 4. paramagnetic; 4 5. paramagnetic; 1 Explanation: 004 (part 1 of 1) 10 points Predict the electron arrangement in NO- 2 . 1. linear 2. trigonal planar correct 3. pentagonal bipyramidal 4. tetrahedral 5. octahedral 6. trigonal bipyramidal Explanation: There are three regions of electron density Kolar, Leah Exam 2 Due: Mar 7 2007, noon Inst: McCord 2 (including one lone pair) around the central atom: " N O O #- 005 (part 1 of 1) 10 points When two H atoms are brought together from large distances they can make H 2 . When this happens, the change in potential energy is about 1.- 4 kJ/mol. 2.- 0.4 kJ/mol. 3.- 4000 kJ/mol. 4.- 40 kJ/mol. 5.- 400 kJ/mol. correct Explanation: 006 (part 1 of 1) 10 points Which of the following is a radical? 1. BrO correct 2. BF- 4 3. CH + 3 4. CH- 3 Explanation: Odd valence e- count. 007 (part 1 of 1) 10 points In the Lewis dot structure of the molecule ClF 3 , how many unbonded electron pairs are found around the central atom? 1. 4 2. 1 3. 4. 2 correct 5. 3 Explanation: Draw the Lewis dot structure. ClF 3 has 3 Cl F single bonds and 2 lone pairs on Cl. 008 (part 1 of 1) 10 points Consider the following covalent bond radii: Single Double Triple C 77 pm 67 pm 60 pm N 75 pm 60 pm 55 pm O 74 pm 60 pm- S 102 pm-- What is the approximate length of the NN bond in nitrogen hydride (HNNH) using the table values?...
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exam 2 spring 2007 - Kolar, Leah Exam 2 Due: Mar 7 2007,...

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