Midterm I spring 2007

Midterm I spring 2007 - Version 1 (yellow) Chemistry 231,...

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Version 1 (yellow) Chemistry 231, Midterm I Instructor: Bergdahl Spring 2007 Name:_________________________________________________________ Be prepared to show ID upon request. **No cellular phones or calculators are allowed during the test** My laboratory instructor (TA) for Spring 2007 is (Please circle): Isabelle Casey Gloria No TA this semester Before you start the exam, make sure that you have x problems!!
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Version 1 (yellow) My student I.D. (red I.D.) number is: A very Good Luck For graders only: Problem: #1_________/6p #2_________/4p #3_________/8p #4_________/8p #5_________/6p #6_________/6p #7_________/10p #8_________/10p #9_________/10p #10________/4p #11________/10p #12________/12p #13________/6p Total:________/100p
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Version 1 (yellow) Problem 1. A) Carbon monoxide, CO, has a much smaller dipole moment than expected. This observation has puzzled chemists and led to much argument about the nature of the bonding in the molecule. The small dipole moment for CO can be rationalized by concluding that there are three important resonance contributors for the molecule. One of them has no formal charges; the other two are polarized in opposite directions. Write these resonance contributors and analyze each one to see whether (1) each atom has an octet around it and (2) the formal charges are in accord with the relative electronegativities of carbon and oxygen. (4p) B)
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Midterm I spring 2007 - Version 1 (yellow) Chemistry 231,...

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