Modified True/False
Indicate
whether the statement is true or false. If false, change the identified word or phrase to make
the statement true.
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1.
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Chemically, an acid is any substance that produces hydroxide ions when
dissolved in water. _________________________
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2.
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Chemicals that may be used to determine the pH of a substance based upon their
color are commonly known as indicators. _________________________
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3.
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Most plants will grow best in soils with a pH greater than 6.5.
_________________________
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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4.
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All of the following are characteristics of an acid EXCEPT:
a. | having a sour taste. | b. | changing litmus paper from blue to
red. | c. | feeling slippery to the touch. | d. | reacting with metals to produce hydrogen
gas. |
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5.
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Bases have a pH of:
a. | less than 7. | b. | more than 7. | c. | between 5 and
9. | d. | exactly 7. |
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6.
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A neutral solution has a pH of:
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7.
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All of the following are characteristics of a base EXCEPT:
a. | turning litmus from blue to red. | b. | feeling slippery like soap. | c. | having a bitter
taste. | d. | having a pH of more than 7. |
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8.
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An example of a weak base is:
a. | ammonia. | b. | sodium hydroxide. | c. | vinegar. | d. | carbonated
soda. |
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9.
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An acid would be considered strong if it had a pH of:
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10.
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A base would be considered weak if it had a pH of:
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11.
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Most plants grow best in soil that is:
a. | strongly acidic. | b. | strongly basic. | c. | slightly
acidic. | d. | slightly basic. |
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12.
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Most freshwater lakes and ponds have a natural pH of between:
a. | 4 to 6 | b. | 6 to 8 | c. | 8 to
10 | d. | 10 to 12 |
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13.
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The hydronium ion can be represented as:
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14.
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The hydroxide ion can be represented as:
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Short Answer
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15.
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Name a common household use for bases.
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16.
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How does the pH of the blood change when you hold your breath? Why?
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17.
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The stomach lining secretes HCl with a pH of about 1.4. Why are the stomach and
other organs not damaged by this strong acid?
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Essay
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18.
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What determines if an acid will be strong or weak?
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