chapter2_biochemisty I_ Home work

chapter2_biochemisty I_ Home work - Chapter 2 Water: The...

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Chapter 2 Water: The Medium of Life Chapter 2 Water: The Medium of Life 1. Properties of water that render it so suited to its role as a medium of life include all EXCEPT: a. Unrivaled ability to form hydrogen bonds. b. Unusually high dielectric constant of water explains water’s ability to surround ions and increase the ions’ attraction for one another. c. Unparalleled ability to orient around nonpolar solutes to promote hydrophobic interactions. d. The small, but significant, tendency to form H + and OH - ions. e. None, all are true. 2. All are true for water for a substance of its molecular weight that is neither metallic nor ionic EXCEPT: a. a high surface tension. b. a chemically inert solvent, which has a great capacity to dissolve a diverse spectrum of molecules and ions. c. a positive volume of melting. d. a high dielectric constant. e. a high capacity to form hydrogen bonds 3. The unrivaled ability to form ___ hydrogen bonds per liquid water molecule is the source of the strong intermolecular attractions unique to water. a. 1 b. 2 c. 3 d. 4 e. 5 4. Because of its highly polar nature, water is an excellent solvent for polar substances, but NOT for: a. salts. b. sugars. c. aldehydes and ketones. d. hydrocarbons. e. alcohols and amines. 5. The solvent with the highest dielectric constant in this group is: a. water. b. acetic acid. c. ethanol. 1
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Chapter 2 Water: The Medium of Life d. hexane. e. benzene. 6. Hydrogen bonds in ice are all EXCEPT: a. directional. b. straight. c. weak. d. responsible for the lower density of ice over liquid water. e. holding water molecules in ice apart. 7. Pure liquid water consists of H 2 O molecules: a. held in a rigid three-dimentional network. b. with local preference for linear geometry. c. with large numbers of strained or broken hydrogen bonds. d.
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This note was uploaded on 01/05/2011 for the course BLY 440 taught by Professor Williams during the Fall '10 term at Alabama.

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chapter2_biochemisty I_ Home work - Chapter 2 Water: The...

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