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Prelim2Answers - CHEMISTRY 2090 PRELIM II Your Name(P lease...

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CHEMISTRY 2090 PRELIM II November 13, 2008 Your Name: ( P lease print ) Last First CORNELL NetID Day and Time of Your ANSWERS Lab-Recitation Section: Lab-Recitation TA: Complete academic integrity is expected of all students of Cornell University at all times, whether in the presence or absence of members of the faculty or teaching staff. Understanding this, I declare that I shall not give, use, or receive unauthorized aid in this examination. Your Signature: There are 6 (multipart) questions and a total of 11 pages (including this cover sheet, a blank page after all the questions and a periodic table at the end). Make sure that your examination booklet is complete. The prelim is not designed with the idea that all, or necessarily any of you, will complete each and every question. Write your answers directly on these sheets. Use the blank page, or if necessary the backs of pages, but clearly indicate on the problem page where work can be found. If you need to include additional pages, please attach them securely to the rest of the test book. Be brief, concise, and neat. Include only material pertinent to the question asked. Proctors are not allowed to interpret questions for you. In case of doubt, indicate the assumptions on which your answer is based. No additional formulas, or values of fundamental constants, are required to answer these questions; if you believe that there is missing information, please check to make sure that you have taken advantage of any information provided to you in the problem. Pay attention that the significant figures reported in your answers are not unreasonable. You may leave when you are finished, except in the final minutes of the exam. Please do so quietly after turning your paper. Question 1. (20) Question 2. (14) Question 3. (16) Question 4. (18) Question 5. (18) Question 6. (14) Total (100) Show your work! (Unless you don’t care to receive partial credit). 1
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1. (20 points) For each of the following molecules or ions (continuing on the next page): (a) draw all reasonable Lewis structures (including any resonance structures); (b) use VSEPR theory to predict all of the approximate bond angles around the central atom(s); (c) predict orbital hybridization (where appropriate); (d) assign any nonzero formal charges; (e) for neutral molecules, indicate any nonzero molecular dipole moments with a vector showing the positive and negative ends of the dipole (e.g. + −→ , where the arrowhead points to the negative end of the dipole) i. CH 3 Cl ii. PCl 5 2
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iii. NO + 2 iv. CO(NH 2 ) 2 2. Carbon and oxygen can form a substance known as carbon suboxide, with chemical formula C 3 O 2 (one carbon bonded to two carbons, and those two carbons also attached to one oxygen each, as in OCCCO).
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