Sample final - Chemistry 3A Professor J Frchet Final Exam Page 1 of 14 Your full signature Print your full name Your SID If you are making up an

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Do not write in this box. 1. _____________ (10) 2. _____________ (11) 3. _____________ (12) 4. _____________ (38) 5. _____________ (12) 6. _____________ (12) 7. _____________ (12) 8. _____________ (10) 9. _____________ (14) 10. _____________(14) Total ______ __ ( 145 ) Chemistry 3A Final Exam, May 16, 2009 Page 1 of 14 Professor J. Fréchet Your full signature P r i n t y o u r f u l l n a m e Y o u r S I D If you are making up an incomplete (I) grade Indicate the semester you took the course ______________ Name of the instructor for that course:_____________________ This exam has 14 pages; make sure that you have them all. Page 14 has no question on it, it may be detached and used for scratch work. Calculators are allowed. We will only grade answers that are in the designated spaces when space is provided. Write only one answer to each problem; multiple answers will receive no credit, even if one of them is correct. Note: This examination runs for a total of 180 minutes . No questions will be answered by proctors after the exam begins. Please write legibly; ambiguous, faint, or messy answers will receive no credit . Data provided: Value of gas constant: R = 2.0 cal K -1 mol -1 [H 2 O] = 55 mol L -1 Value of absolute zero (Kelvin) = -273 o C Value of each CH 3 -H eclipsing interaction: 1.5 kcal mol -1 D is the symbol we use for deuterium: the 2 H isotope of hydrogen © 2009 J.M.J. Fréchet, all rights reserved Partial periodic table of the elements
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Chemistry 3A May 2009 Page 2 of 14 1. ( 10 Points) (a) Write a balanced equation showing starting materials, other necessary inputs, and products in the “Syngas” process. (b) Write a balanced equation illustrating the Fischer-Tropsch process (c) An acid has pK a = 3.25 What is its K eq ? Show the equation used to calculate K eq . Answer: K eq = ______________ (d) Write a balanced equation for the combustion of 1-propyne in oxygen (e) How many σ (sigma) and how many π (pi) bonds are there in the molecule shown below (Go slow! Do not forget to count all CH bonds!) © O CCC H 2 CN Answers: # of Sigma bonds = ___________ # of Pi bonds = _____________
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Chemistry 3A May 2009 Page 3 of 14 2. (11 Points) (a) The energy difference between substituted two cyclohexane conformers A and B is +1.2 Kcal mole -1 calculate the equilibrium constant K eq at 300 K. Show the equation used for your calculation. (b) A sample of 2-bromobutane has [ α ] D = +8°; given that pure (S)-2-bromobutane has [ α ] D = +24° what is the % ee of the sample? What is the percentage of (S)-2-bromobutane in the sample? Show your calculation (c). Show the structures of the molozonide and ozonide intermediates obtained in the reaction of ozone with 2,3-dimethyl-2-butene. Molozonide Ozonide (d) Name the famous scientist who proposed the concept and established the scale of electronegativity. Answer: _________________________________ (e) Name the famous scientist who discovered enantiomers. Answer: ___________________________________ © Answer: K eq = Answer. % ee = % of (S)-2-bromobutane in sample = ozone
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Chemistry 3A May 2009 Page 4 of 14 3. (12 Points) (a) Write a step by step mechanism for the reaction below: (b) propose a synthesis of: Show all steps and reagents.
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This note was uploaded on 10/25/2010 for the course CHEM fghkj taught by Professor Frechet during the Spring '10 term at University of California, Berkeley.

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Sample final - Chemistry 3A Professor J Frchet Final Exam Page 1 of 14 Your full signature Print your full name Your SID If you are making up an

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