Final-I F09 (2)

Final-I F09 (2) - State University of New York at Stony...

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State University of New York at Stony Brook Department of Chemistry CHE 141, Honors Chemistry I Final Exam Dec. 16, 2009 Form 1 Please answer all questions specifically, concisely, and readably in the spaces provided on the answer sheet. Your name and student identification number must be written on the answer sheet, and your signature must be entered at the upper right. The answer sheets will not be returned, so you should record your answers on the question pages for comparison with the posted answers. Answers and grades will be posted on the Blackboard website. Think before writing. Use the backs of these pages for scratch work. The first twelve questions are multiple choice. They are worth ten points each. Please circle your choice for each question in the corresponding space on the answer sheet. Write the answers to questions 6- 9 in the spaces provided on the answer sheet. If you wish to earn partial credit, you must show your work. K a ammonium ion, NH 4 + 5.6 x 10 -10 9.25 and pK A acetic acid, CH 3 CO 2 H 1.8 x 10 -5 4.75 values: ascorbic acid, C 6 H 8 O 6 7.9 x 10 -5 , 1.6 x 10 -12 4.10, 11.8 “carbonic acid, H 2 CO 3 4.3 x 10 -7 6.37 bicarbonate ion, HCO 3 - 5.6 x 10 -11 10.25 citric acid, C 3 H 5 (COOH) 3 8.4 x 10 -4 , 1.8 x 10 -5 , 4.0 x 10 -6 3.08, 4.75, 5.40 phosphoric acid, H 3 PO 4 7.5 x 10 -3 , 6.2 x 10 -8 , 4.8 x 10 -13 2.12, 7.21, 12.32 Average bond energies (kJ/mol): C-C 347, C=C 614, C-H 413, C-Br 276, Br-Br 193 1. In what form will the majority of the citric acid exist at neutral pH? (A) neutral form
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Final-I F09 (2) - State University of New York at Stony...

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