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. |
Water
is not very good for dissolving ionic compounds. ____________________
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2. |
Parts
per million is a concentration unit that is used to express very
large concentrations of ions in solution. ____________________
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3. |
Drinking water contains dissolved iodide ions to kill bacteria.
____________________
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4. |
The
quantity of oxygen dissolved in a body of fresh water is directly
related to the health of the aquatic ecosystem. ____________________
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5. |
Boiling water is an effective way to soften water. ____________________
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6. |
Warm
lake water will contain more dissolved oxygen than cold lake
water. ____________________
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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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7. |
Which
of the following compounds does not dissolve very well in water?
a. |
sodium
chloride |
c. |
alcohol |
b. |
sugar |
d. |
gasoline |
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8. |
An
underground formation that collects and stores water is a(n)
a. |
puddle |
c. |
aquifer |
b. |
reservoir |
d. |
pond |
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9. |
Which
of the following substances is a common source of water contamination?
a. |
agricultural
fertilizers |
c. |
agricultural
pesticides |
b. |
road salt runoff |
d. |
all of the above |
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10. |
The
contamination of Walkerton’s water supply in 2000 was caused by
a. |
lead |
c. |
pesticides |
b. |
mercury |
d. |
E. coli bacteria |
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11. |
Which
of the following chemical substances is used to form a sticky precipitate
that helps to clear murky water?
a. |
household
ammonia |
c. |
aluminum
sulfate |
b. |
alum |
d. |
all of the above |
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12. |
Which
of the following ions, if found in large concentrations in a freshwater
source, causes the water to be “hard”?
a. |
magnesium, Mg |
c. |
nitrate,
NO |
b. |
sulfide,
S |
d. |
sodium, Na |
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13. |
Water
is classified as “moderately hard” if the concentration of
hard water ions is
a. |
50–200
ppm |
c. |
<50
ppm |
b. |
200–400
ppm |
d. |
>400
ppm |
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Completion
Complete each sentence
or statement.
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14. |
The
physical properties that you could measure to identify pure water are
____________________, ____________________, and ____________________.
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15. |
If
a sports drink contains 50 mg of sodium ions per 500 mL, the concentration
of sodium ions, in ppm, is ____________________.
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16. |
Fertilizers used in agricultural applications are the main source
of ____________________ and ____________________ ions that contaminate
Great Lakes fresh water.
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17. |
The
presence of certain ions in a water sample can be determined by adding
a test chemical and observing the formation of a ____________________.
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18. |
A
particular type of light, ____________________, is quite effective at
destroying biological contaminants in water.
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19. |
A
two-step process of evaporation and condensation that is used to purify
water is called ____________________.
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