11. What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

A. 7
B. 7 x 10-⁷
C. 5 x 10-⁷
D. 1 x 10-⁷

12. Which of the following alcohols would be most soluble in water?

A. methanol
B. ethanol
C. butanol
D. octanol

13. Which of the following acid/base pairs act as natural buffers in living systems?

A. H₂CO₃/HCO₃–
B. H₂PO₄-/HPO₄²–
C. Histidine+/histidine
D. All of these

14. If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

A. be repelled by water
B. It will be attracted to water
C. It will form a membrane in water
D. It will act as a buffer and stabilize the pH

15. A compound that is capable of forming hydrogen bonds with water

A. is probably held together by noncovalent bonds
B. contains at least some polar covalent bonds
C. should act as a good buffer for acids and bases
D. does not dissolve well in water