Practice MT1

Practice MT1 - BIS 102, Prof. C. Gasser 89 1. (18) In each...

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BIS 102, Prof. C. Gasser 89 1. (18) In each blank, write the name of the strongest of the weak interactions that would be likely to occur between the side chains of the two amino acids listed next to the blank (assume an aqueous solution at pH7). Hydrophobic interaction F and W H-bond Gln and Asn Hydrophobic interaction Methionine and Leucine Salt Bridge K and D H-bond Ser and Ser H-bond D and N 2. Some biochemical applications require concentrated solutions of cesium chloride (CsCl). To make up such a solution you add 2 g of solid CsCl to 10 ml of room temperature (25°C) water and begin to mix it. As the CsCl dissolves you feel the mixture getting noticeably cold to the touch. When the CsCl is completely dissolved you measure the temperature of the solution and find it to be 4°C. a) (4) Is Δ G for the dissolution of CsCl in water at room temperature less than, greater than, or equal to zero? (circle correct answer). Why? The reaction was spontaneous at constant pressure so it must have a negative Δ G. b) (4) Is Δ H for the dissolution of CsCl in water at room temperature less than, greater than, or equal to zero? (circle correct answer) Why? The temperature of the solution decreased because heat was taken up by the reaction. This is defined as a positive enthalpic change. c) (4) Is Δ S for the dissolution of CsCl in water at room temperature less than, greater than, or equal to zero? (circle correct answer) Why? Δ G = Δ H – T Δ S. Since Δ G is less than zero and Δ H is positive, Δ S must be positive for the equation to balance.
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BIS 102, Prof. C. Gasser 90 3. (12) Consider the following set of reactions and Δ G°’ values.
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Practice MT1 - BIS 102, Prof. C. Gasser 89 1. (18) In each...

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