UMD CHEM 271 - Final Exam (15 pages)

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Final Exam



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Final Exam

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Exam


Pages:
15
School:
University of Maryland, College Park
Course:
Chem 271 - General Chemistry and Energetics
General Chemistry and Energetics Documents

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Chemistry 271 Section 21xx Your Name University of Maryland College Park Your SID General Chemistry and Energetics Prof Jason Kahn Final Exam 200 points total May 14 2007 You have 120 minutes for this exam Exams written in pencil or erasable ink will not be re graded under any circumstances Explanations should be concise and clear I have given you more space than you should need There is extra space on the last page if you need it You will need a calculator for this exam No other study aids or materials are permitted Generous partial credit will be given i e if you don t know guess Useful equations and schemes are given on a tear off sheet at the end Honor Pledge At the end of the examination time please write out the following sentence and sign it or talk to me about it I pledge on my honor that I have not given or received any unauthorized assistance on this examination 1 Thermodynamics 50 pts a 12 pts In the table below fill in the signs of G and whether the reaction is spontaneous at all T spontaneous at no T spontaneous at low T or spontaneous at high T Don t be insulted some of the questions below are harder Sign of H Sign of S Sign of G Spontaneity circle none one or both at low T low T at high T high T at low T low T at high T high T at low T low T at high T high T at low T low T at high T high T Score for the page 2 15 Chemistry 271 section 21xx Final Exam 5 14 07 b 4 pts Give an example of an exothermic ordering reaction c 4 pts Give an example of an endothermic disordering reaction d 8 pts What are the signs of S and H for the reaction at the right and why e 2 pts What does part d tell us about the kinetics of the octanitrocubane decomposition reaction A one word answer will do Score for the page 3 15 Chemistry 271 section 21xx Final Exam 5 14 07 Consider the reaction A B C where 1 the overall reaction A C is strongly downhill 2 the reaction is a rapid pre equilibrium followed by a rate limiting step 3 the equilibrium A B is exothermic and d the



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