2. Cell Chemistry & Cell Components

Which of the following reactions is most consistent with that of a base?

a) NH₄⁺ → NH₃ + H⁺

b) H₂CO₃ → HCO₃^- + H⁺

c) NaOH → Na⁺ + OH^-

d) HCl → H⁺ + Cl^-

The addition of an acid like HCl to an aqueous solution (pure water) would result in:

a) An increase in pH only.

b) Both the release of H⁺ and an increase in pH.

c) Both the release of H⁺ and a decrease in pH.

d) The release of H⁺ into the solution only.

e) A decrease in pH only.

In what way(s) do bases work to increase the pH of a solution?

a) Increasing the concentration of hydroxide ions.

b) Decreasing the concentration of hydrogen ions.

c) Decreasing the concentration of hydroxide ions.

d) Increasing the concentration of hydrogen ions.

e) Both a & b.

f) Both c & d.

Which of the following is not a property of water?

a. Water has a high heat capacity.

b. Water doesn't take heat with it when it evaporates.

c. Water is a polar solvent in which many solutes will dissolve.

d. Water serves as a cushion and lubricant in the body.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a .Acids dissociate in water to give hydrogen ions and an anion.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c .A buffer is a system of chemicals that resists a change in pH

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. A solution with a pH of 10 has more hydrogen ions than a solution with a pH of 2.

A salt is:

a. a metal cation bonded to a nonmetal anion.

b. a hydrogen ion donor.

c. an electrolyte that conducts electricity in water.

d. Both a and c are correct.

e. Both b and c are correct.