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. |
Measuring the concentration of cholesterol in blood is an example
of quantitative analysis. ____________________
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2. |
A
solution is concentrated if it has a relatively small quantity
of solute per unit volume of solution. ____________________
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3. |
The
concentration of a solution may be expressed as a percentage V/W if
it is composed of a liquid solute and a liquid solvent. ____________________
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4. |
Adding more solvent to a solution changes the amount of
solute in the solution. ____________________
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5. |
The
following balanced equation has the mole ratio: 2 mol CO(g)
: 1 mol O2(g) : 2 mol CO2(g). ____________________
2
CO(g) + O2(g) ® 2 CO2(g)
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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. |
The
molar concentration of a solution that contains 0.25 mol sucrose in
2.5 L of solution is
a. |
0.1
mol/L |
c. |
10
mol/L |
b. |
0.01 mol/L |
d. |
100 mol/L |
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7. |
The
amount of NaOH(aq) in 0.250 L of a 3.0-mol/L solution is
a. |
0.25
mol |
c. |
1.0
mol |
b. |
0.75
mol |
d. |
1.5
mol |
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8. |
According to the Safe Drinking Water Act, the maximum permitted
concentration of lead in public drinking water is 0.05 ppm. Therefore,
according to the Act, the maximum permitted mass of lead in 1 L of public
drinking water is
a. |
0.05 mg |
c. |
5 mg |
b. |
0.5 mg |
d. |
0.5 g |
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9. |
When
75 mL of 0.15-mol/L HCl(aq) is diluted with distilled water
to a final volume of 150 mL, the concentration of HCl(aq)
is reduced to
a. |
0.12
mol/L |
c. |
0.050
mol/L |
b. |
0.10 mol/L |
d. |
0.075 mol/L |
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10. |
What
amount of chlorine gas reacts with 0.752 mol phosphorus, P4(s),
in the reaction described by the following balanced equation?
P4(s) + 6
Cl2(g) ®
4 PCl3(l)
a. |
0.501 mol |
c. |
4.51 mol |
b. |
35.0
mol |
d. |
2.47
mol |
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11. |
What
amount of lithium nitride, Li3N(s), is produced
when 15.0 g of lithium, Li(s), reacts with excess nitrogen
gas according to the following balanced chemical equation?
6 Li(s) + N2(g) ®
2 Li3N(s)
a. |
5.00 mol |
c. |
0.720 mol |
b. |
25.2
mol |
d. |
4.99
mol |
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12. |
What
mass of copper is consumed when 15.0 g of nitric oxide, NO(g),
is produced according to the following balanced equation?
3 Cu(s) +
8 HNO3(aq) ®
3 Cu(NO3)2(aq) + 4 H2O(l)
+ 2 NO(g)
a. |
15.0
g |
c. |
47.6
g |
b. |
22.5
g |
d. |
192
g |
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13. |
What
mass of oxygen gas is required to combust 81.2 g of methane, CH4(g),
completely according to the following balanced chemical equation?
CH4(g) + 2 O2(g) ® CO2(g) + 2 H2O(l)
a. |
814 g |
c. |
203 g |
b. |
406
g |
d. |
324
g |
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14. |
What
mass of silicon oxide, SiO2(s), may form when 81.4 g of silicon
reacts with excess oxygen according to the following balanced chemical
equation?
Si(s)
+ O2(g) ® SiO2(s)
a. |
250
g |
c. |
174
g |
b. |
375
g |
d. |
81.4
g |
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Completion
Complete each sentence
or statement.
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15. |
The
____________________ of a solution is a ratio of the quantity of solute
to the quantity of ____________________.
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16. |
Hydrogen peroxide may be purchased at most pharmacies as a 3% V/V
aqueous solution. The V/V notation indicates that two ____________________
are mixed to make the solution.
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17. |
In
laboratory chemistry, the concentration of solutions is more commonly
expressed in ____________________ concentration units.
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18. |
Two
parts per million of fluoride ions in drinking water corresponds to
2 g of fluoride ions in ____________________ L of drinking water.
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19. |
The
concentration of a solution may be decreased by adding more ____________________.
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20. |
____________________ is a part of chemistry that deals with the
relationships between quantities in chemical reactions.
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21. |
To
predict the masses of reactants and products in a reaction, always begin
with a ____________________ equation for the reaction.
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22. |
The
mole ratio is the ratio of the ____________________ of reactants and
products in a chemical reaction
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