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Midterm1WhiteKey - Name White Key Last First BIS102-02...

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Name White Key BIS102-02, Spring '10, Page 1 of 8 Last, First C. S. Gasser BioSci 102-002 Apr. 20, 2010, First Midterm Instructions: There are eight pages in this exam including the cover sheet, please count them before you start to make sure all are present. Write your name on each page of the exam. Write your answers in the space provided below each question. If you need more space use the back of the page and indicate clearly that you have continued your answer on the back. Do not use additional paper. For calculation problems a clear line of calculations leading to your final answer must be shown to obtain full credit. Use the following pK a values for the exam. Amino Acid α -NH 2 α -COOH R-group log 1.0 = 0.00 Ala, Gly, Ile, Leu, Val 9.7 2.3 log 1.5 = 0.18 Asn, Gln 9.0 2.1 log 2.0 = 0.30 Met, Ser, Trp 9.3 2.3 log 2.5 = 0.40 Phe 9.1 1.8 log 3.0 = 0.48 Pro 10.6 2.0 log 3.5 = 0.54 Thr 10.4 2.6 log 4.0 = 0.60 Asp 9.8 2.1 3.9 log 4.5 = 0.65 Glu 9.7 2.2 4.2 log 5.0 = 0.70 His 9.2 1.8 6.0 log 5.5 = 0.74 Cys 10.8 1.8 8.3 log 6.0 = 0.78 Tyr 9.1 2.2 10.0 log 6.5 = 0.81 Lys 9.0 2.2 10.5 log 7.0 = 0.85 Arg 9.0 2.2 12.5 log 7.5 = 0.88 log 8.0 = 0.90 R = 8.3 X 10 -3 kJ/K•mol log 8.5 = 0.93 log 9.0 = 0.95 25°C = 298K log 9.5 = 0.98 log 10.0 = 1.00
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Name White Key BIS102-02, Spring '10, Page 2 of 8 Last, First C. S. Gasser Question Value Score 1 14 2 23 3 20 4 32 5 15 6 16 7 16 8 14 Total 150 1. (14) You are working with a novel hydrophobic “compound X” isolated from a marine alga. You are able to measure energetic changes as that compound separates from water. You find that the Δ G for separation of compound X from the aqueous phase following mixing is -18 kJ/mol at 25°C. Answer the following questions. a) (6) Given that the strength of the hydrophobic effect is -0.01 kJ/mol•Å 2 , what is the apparent surface area of the hydrophobic compound? (-18 kJ/mol)/(-0.01 kJ/mol•Å 2 ) = 1,800 Å 2 Surface area = 1,800 Å 2 Units b) (8) You use a microcalorimeter to measure the temperature change of the process of separation of water and compound X. You find that the temperature of the material drops during spontaneous separation. From this you determine that the Δ H for separation is +0.5 kJ/mol. Based on this, what is the Δ S for the separation of compound X from water at 25°C?
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