1. Acids are aqueous solutions which have an excess of which ion?

a) Hydrogen ions (H⁺)
b) Hydroxide ions (OH^-)
c) Chloride ions (Cl^-)
d) Oxide ions (O^2-)

2. The state symbol (aq) indicates that a substance is:

a) A gas
b) A liquid
c) A solid
d) Dissolved in water

3. A strong acid is one that:

a) Partially dissociates in water
b) Completely dissociates in water
c) Does not react with water
d) Produces hydroxide ions when dissolved in water

4. is a dilute solution of the weak acid ethanoic acid.

5. Weak acids only partly when they are added to , this means that the concentration of hydrogen ions (H⁺) will be low. .

6. Which of the following is a weak acid?

a) Sulfuric acid
b) Hydrochloric acid
c) Hydroiodic acid
d) Citric acid

7. pH is a measure of the concentration of which ion in a solution?

a) Hydroxide ions (OH^-)
b) All ions in the solution
c) Hydrogen ions (H⁺)
d) Water molecules present

8. What happens to the hydrogen ion concentration when the pH of a solution decreases by 1?

a) It increases by a factor of 10
b) It decreases by a factor of 10
c) It increases by a factor of 100
d) It decreases by a factor of 100

9. The term dilute and concentrated refer to the amount of in the solution.

10. Reactions of weak acids tend to be:

a) More violent than those using strong acids
b) Produce lower temperature changes than those with strong acids
c) Are more exothermic
d) Endothermic reactions