Modified True/False
Indicate
whether the sentence or statement is true or false. If false,
change the identified word or phrase to make the sentence or statement
true.
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1. |
According to Arrhenius, acids produce hydrogen ions when
dissolved in water. ____________________
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2. |
A
weak acid is a dilute solution. ____________________
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3. |
The
concentration of an acid or a base is usually expressed as mol/L.
____________________
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4. |
The
pH scale measures only the acidity of a solution. ____________________
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5. |
A
titration is a lab procedure that involves the dilution of an acidic
or basic solution. ____________________________________________________________
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Multiple Choice
Identify
the letter of the choice that best completes the statement or answers
the question.
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6. |
A
solution with a precise concentration is called a
a. |
standard solution |
c. |
chemical solution |
b. |
dilute
solution |
d. |
concentrated
solution |
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7. |
Which
piece of laboratory equipment is used to transfer a small, accurately
known volume of liquid from a commercial solution?
a. |
graduated cylinder |
c. |
burette |
b. |
pipette |
d. |
beaker |
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8. |
To
safely dilute concentrated acids, you should always add
a. |
a
small volume of acid to a large volume of water |
b. |
a tiny volume of water to the acid |
c. |
a
large volume of acid to a small volume of water |
d. |
a 50–50 mixture of acid and water |
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9. |
Why
is nitric acid classified as a strong acid?
a. |
It has a high electrical conductivity. |
b. |
It ionizes about 50%. |
c. |
It
ionizes more than 99%. |
d. |
It has a high electrical conductivity, and
it ionizes more than 99%. |
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10. |
For
a neutral solution, which of the following statements is true?
a. |
The
concentration of hydrogen ions, [H+], equals 1 ´ 10–7 mol/L. |
b. |
The
pH of a neutral solution is 7. 0. |
c. |
The concentration of hydrogen ions, [H+],
equals the concentration of hydroxide ions, [OH–]. |
d. |
all
of the above |
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11. |
An
acid has a pH of 4. If water is added to the acid to dilute it, what
will occur?
a. |
The
pH will decrease. |
c. |
The
pH will not change. |
b. |
The pH will increase. |
d. |
none of the above |
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12. |
An
acid solution, such as vinegar,
a. |
turns red litmus paper blue |
c. |
has a bitter taste |
b. |
turns
blue litmus paper red |
d. |
feels
slippery |
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13. |
How
much more acidic is vinegar (pH = 2) than coffee (pH = 5)?
a. |
3.
0 |
c. |
100 |
b. |
1000 |
d. |
2. 5 |
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14. |
Which
of the following is an application of a titration?
a. |
determining
the concentration of acetic acid in vinegar |
b. |
determining the concentration of acid in
a commercial rust remover |
c. |
performing a laboratory acid–base neutralization |
d. |
all of the above |
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Completion
Complete each sentence
or statement.
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15. |
When
an acidic solution is diluted, the pH ____________________. When a basic
solution is diluted, the pH ____________________.
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16. |
Hydrochloric acid is added to several small pieces of zinc in a
test tube. When a lighted splint is brought to the mouth of the test
tube, it ____________________. The gas produced is ____________________.
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17. |
Hydrochloric acid is added to sodium hydrogen carbonate (baking
soda) in a test tube. When drops of limewater are placed near the top
of the test tube, they turn ____________________. The gas produced is
____________________.
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18. |
An
oxide that is soluble in water and causes blue litmus to turn red is
____________________. An oxide that is soluble in water and causes red
litmus to turn blue is ____________________.
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19. |
The
____________________ ion is responsible for the properties of an acid.
The ____________________ ion is responsible for the properties of a
base.
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20. |
An
acid and a base react with one another in a(n) ____________________
reaction to produce a(n) ____________________ and ____________________.
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