2. (2 pts) Which ONE statement about water is NOT true? a. The oxygen atom in wa

Question

2. (2 pts) Which ONE statement about water is NOT true? a. The oxygen atom in water molecules has two lone pairs of electrons b. Water molecules can form hydrogen bonds with one another. c. Water has a net dipole moment because hydrogen is more electronegative than oxygen. d. The concentration of H+ ions in pure water is 1 x 10-7 M. e. Water can both donate and accept H' ions. 3. (2 pts) Which ONE of the following statements best explains the hydrophobic effect? a. Hydrophobic moieties form hydrogen bonds with one another. b. Hydrophobic moieties are surrounded by water shells, which then hydrogen bond. c. Van der Waals forces, operating over long distances, draw hydrophobic moieties together. d. Water molecules have a partial negative charge that repels hydrophobic moieties. e. Crowding hydrophobic moieties together minimizes ordering of water molecules 4. (2 pts) Each of the following statements is true of all living organisms EXCEPT: a. b. c. d. e. Are composed primarily of water and small molecules (e.g. sugars and amino acids) Have the capacity for self-replication while allowing enough change for evolution to occur Extract, transform, and use energy to maintain structures and do work Are composed of cells Sense, and respond to, changes in the surrounding environment

Explanation / Answer

2) Which one statement about water is not true:

c) Water has a net dipole moment because hydrogen is more electronegative than oxygen.

3) Which of the following statements best explains the hydrophobic effect?

e) Crowding hydrophobic moieties together minimize ordering of water molecules.

4) Each of the following statements is true of all living organisms except:

b) Have the capacity for self-replication while allowing enough change for evolution to occur.

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