problem_set2Key - Problem Set 2 Key February 17, 2006 1. O...

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Problem Set 2 Key February 17, 2006 1. O pulls electrons of the covalent bond closer to it than to H. Thus O in water has a partial negative charge and H a partial positive charge. When ionic or charged materials dissolve in water, the charges on the water successfully replace the charge attractions between the molecules of the material. Thus there is little if any loss of bonding and little if any increase in enthalpy. As a result, the increase in entropy due to mixing of water and the material dissolving in it drives the reaction, giving the negative energy change. 2. Vitamin E non polar and thus is fat soluble, and doesn’t dissolve in water. Thus it cannot be readily excreted, and instead dissolves in the non polar cores of membranes and accumulates. Vitamin C is water soluble and readily excreted in the urine 3. a --COO - and H + . b. As part of the acid, the proton is covalently bound to O, sharing its electron with the O, and sharing one of the O’s electrons. When apart, it leaves its electron behind with the amino acid, and has only a proton and no electrons.
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This note was uploaded on 08/01/2008 for the course MCB 11 taught by Professor Alper during the Spring '06 term at University of California, Berkeley.

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problem_set2Key - Problem Set 2 Key February 17, 2006 1. O...

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