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test1-1 - Chemistry 2740 Spring 2010 Test 1 Time 50 minutes...

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Chemistry 2740 Spring 2010 Test 1 Time: 50 minutes Marks: 41 Aids allowed: calculator, 8 . 5 × 11-inch formula sheet Useful data is given on the reverse of this page. 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). 1. Briefly explain any three of the following concepts [3 marks each]: (a) Coupled reactions (b) Indirect calorimetry (c) Microstate (d) Third law of thermodynamics (e) Vapor pressure 2. ATP (adenosine 5’-triphosphate) is the major energy carrier in cells. Energy is mainly released from ATP in the hydrolysis reaction ATP + H 2 O ADP + P i , where ADP is adenosine 5’-diphosphate, and P i represents “inorganic phosphate”, i.e. one of the protonation states of the phosphate anion. For this reaction, Δ r H m = - 30 . 88 kJ / mol. In a turtle hepatocyte (liver cell) with a volume of 10 - 11 L, 7 × 10 - 13 mol of ATP are consumed per hour. Assume that a cell is mostly water with a density of
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