Exam 2 - Version 380 Exam 2 mccord (50970) This print-out...

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Version 380 – Exam 2 – mccord – (50970) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points The length oF an O H bond in water is ap- proximately 1. 1.0 m. 2. 1 . 0 × 10 4 cm. 3. 1 . 0 × 10 12 cm. 4. 1 . 0 × 10 8 cm. correct Explanation: In water the O H bond has a length oF 9.6 × 10 11 m. 002 0.0 points EXTRA CREDIT QUESTION: A re- minder here to PLEASE bubble in your name, uteid, and your version number correctly. Do it now - don’t wait till the end oF the exam. Also, a reminder that there is NO CLASS tomorrow (±riday, October 8th). That’s right, you get to SKIP chemistry class. I’ll see you on Monday, the 11th, and we’ll start up on Chapter 5. This question starts out at zero points but could very well increase aFter the grad- ing. Now, iF more points are awarded (the curve) on this assignment, would you like them added to your score? 1. NO, leave my score alone, I preFer the lower score 2. YES, I would like the points and the higher score. correct Explanation: This should be a no-brainer. Most students want higher scores. IF you picked yes, you got credit For the question and you got the extra points you asked For (iF they were granted by your instructor). IF you answered NO, you also got what you wanted. .. no points awarded. 003 10.0 points Which oF the Following compounds is non- polar? 1. BH 3 correct 2. O 3 3. NH 3 4. PH 3 5. PCl 3 Explanation: NH 3 , PH 3 and PCl 3 are tetrahedral with one lone pair and are thereFore not symmet- ric; their polar bonds do not cancel, and the molecule is polar. O 3 is bent, with a lone pair on the central oxygen and is thus polar. BH 3 is trigonal planar. The polar B H bonds cancel and the molecule is not polar. 004 10.0 points Which oF the Following is diamagnetic? 1. O 2 2. O 2 3. O + 2 4. O 2 2 correct Explanation: All but O 2 2 are paramagentic (possess un- paired electrons). 005 10.0 points Which is the most polar molecule? 1. 3 2. H 2 O correct 3. 4
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Version 380 – Exam 2 – mccord – (50970) 2 4. CH 4 5. Ar 6. CO 2 Explanation: H 2 O has angular molecular geometry. It is assymetrical and polar. 006 10.0 points Which of the following would have the highest melting point? 1. KCl 2. KI 3. KF correct 4. KBr 5. RbF Explanation: KF has the highest charge density. 007 10.0 points Draw the Lewis structure for CO. 1. b b b b b b O b b b b b b C 2. b b b b b b b b O b b b b b b C 3. b b b b b b O b b b b C 4. O b b b b b b b b b b C 5. b b b b b b O b b b b b b O C 6. b b b b b b O b b b b b b C 7. O b b C 8. b b b b b b b b b b O C correct 9. O b b b b b b b b C 10. O
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This note was uploaded on 02/10/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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Exam 2 - Version 380 Exam 2 mccord (50970) This print-out...

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