final - Chemistry 2740 Spring 2011 Final Examination Time:...

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Unformatted text preview: Chemistry 2740 Spring 2011 Final Examination Time: 3 hours Marks: 100 Aids allowed: calculator, 8 . 5 × 11-inch formula sheet Leaving the room: You may not leave during the first half-hour of the exam, nor dur- ing the last 15 minutes. When you are finished, return your exam booklet(s) to the instructor. Instructions: You can answer the questions in any order, but make sure that you clearly label each of your answers with the question number in your exam booklet(s). Answer all questions in sections 1 and 2. In sections 3 and 4, you have some choice. Answer only the required number of questions. Extra answers will not be marked. If you use a graph to answer a question, make sure to provide a reasonable sketch of the graph, as well as a brief explanation of what information the graph provides. Useful data ε = 8 . 854 187 817 × 10- 12 C 2 J- 1 m- 1 h = 6 . 626 0688 × 10- 34 J / Hz k B = 1 . 380 6503 × 10- 23 J / K R = 8 . 314 472JK- 1 mol- 1 To convert degrees Celsius to Kelvin, add 273.15. ln γ ± =- A | z + z- | ( εT )- 3 / 2 √ I c where A = 1 . 107 × 10- 10 . Properties of water at 25 ◦ C Relative permittivity: 78.54 Viscosity: 0.8904mPas Standard thermodynamic data in the biochemists’ standard state at 25 ◦ C , pH 7 and ionic strength 0.25 mol/L Species Δ f H ◦0 kJ mol- 1 Δ f G ◦0 kJ mol- 1 Acetaldehyde (aq) 24 . 06- 213 . 97 Ethanol (aq) 62 . 96- 290 . 76 NAD ox (aq) 1059 . 11- 10 . 26 NAD red (aq) 1120 . 09- 41 . 38 1 1 Answer all questions in this section. Value of this section: 24 1. Antioxidants are molecules that react with strong oxidizing agents generated by me- tabolism in cells, leaving harmless products. One of the simplest and most common antioxidants is ascorbic acid (C 6 H 8 O 6 ), also known as vitamin C. Ascorbic acid can react with strong oxidizing agents like hydroxyl radicals (OH), producing water and dehydroascorbic acid (C 6 H 6 O 6 ) as products. Balance this reaction, assuming that the pH in the cell is 7. [4 marks] 2. Barbital (5,5-diethylbarbituric acid, C 8 H 12 N 2 O 3 ) is a diprotic acid. Barbital was once) is a diprotic acid....
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This note was uploaded on 03/03/2012 for the course CHEM 2740 taught by Professor Roussel during the Fall '07 term at Lethbridge College.

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final - Chemistry 2740 Spring 2011 Final Examination Time:...

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