Chem 14C Midterm Exam 2

Chem 14C Midterm Exam 2 - Chemistry 14C Spring 2007 Midterm...

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Chemistry 14C Spring 2007 Midterm Exam 2 Page 1 For any question on this exam worth three or more points, you have two choices: answer the question as written or you may write and circle the phrase “one point”. If you write “one point” you will receive one point (and only one point) of credit for the question. “One point” overrides anything you have written for that question, regardless of its accuracy. Example: (10) Briefly explain everything about organic chemistry. One point Red tides (sudden growths of huge red algae colonies) cause a variety of problems for other organisms in their vicinity. Among these problems is the release of domoic acid, which is bioaccumulated as it moves up the food chain. Mammals who eat marine organisms such as shellfish that are contaminated by domoic acid suffer neurotoxic effects such as short-term memory loss, brain damage, and (in severe cases) death. Determining the presence and structure of domoic acid depends heavily upon spectroscopy. HO O N H O OH OH O Domoic acid 1. (2) Write the chemical formula of domoic acid (i.e., C 3 H 60 ). 2. (6) Consider the mass spectrum of domoic acid. (a) Write a number: For M, m/z = (b) When the relative abundance of M is 100%, the best estimate of the relative abundance of M+1 is (circle one): less than 14% 14% 15% 16% 17% 18% 19% 20% 21% 22% more than 22% (c) When the relative abundance of M is 100%, the best estimate of the relative abundance of M+2 is (circle one): less than 1% 1% 2% 4% 8% 10% 30% 60% 100% greater than 100% 3. (2) How many carbons in the 13 C-NMR spectrum of domoic acid have chemical shifts of 100 ppm or
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This note was uploaded on 06/23/2010 for the course CHEM 14C taught by Professor Hardinger during the Spring '08 term at UCLA.

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Chem 14C Midterm Exam 2 - Chemistry 14C Spring 2007 Midterm...

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