Chemistry I Exam 1 review
Name:_______________________
For the multiple choice problems, mark the correct answer on the scantron with the
corresponding problem number. For the open ended problems, show your work on the test, and
make certain units are present in all responses.
1. The distance between carbon atoms in ethylene is 134 picometers. Which of the following
expresses that distance in meters?
A) 1.34 × 10–13 m
B) 1.34 × 10–12 m
C) 1.34 × 10–10 m
D) 1.34 × 10–7 m
E) 1.34 × 10–6 m
2.
A)
B)
C)
D)
E)
A large pizza has a diameter of 15 inches. Express this diameter in centimeters.
38 cm
24 cm
18 cm
9.3 cm
5.9 cm
3. A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the
same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is
the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the
temperature of the measurement.)
A) 1.992 g/cm3
B) 1.840 g/cm3
C) 1.729 g/cm3
D) 1.598 g/cm3
E) 0.543 g/cm3
4. Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®,
boils at 56.1°C. What is the boiling point in degrees Fahrenheit?
A) 159°F
B) 133°F
C) 101°F
D) 69.0°F
E) 43.4°F
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5. Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the
boiling point in kelvins?
A) 387.6 K
B) 355.6 K
C) 323.6 K
D) 190.8 K
E) –190.8 K
6. Select the answer that expresses the result of this calculation with the correct number of
significant figures.
13.602 × 1.90 × 3.06
=
4.2 × 1.4097
A)
B)
C)
D)
E)
13.3568
13.357
13.36
13.4
13
7.
A)
B)
C)
D)
E)
Express 96,342 m using 2 significant figures.
9.60 × 104 m
9.6 × 104 m
9.60 × 10-4 m
9.6 × 10-4 m
96000. m
8. Kaolinite, a clay mineral with the formula Al4Si4O10 (OH)8, is used as a filler in
slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g
of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.
A) 1.792 mass %
B) 24.80 mass %
C) 30.81 mass %
D) 34.12 mass %
E) 55.81 mass %
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9. Iodine pentafluoride reacts slowly with glass and violently with water. Determine its
molecular mass.
A) 653.52 amu
B) 259.89 amu
C) 221.90 amu
D) 202.90 amu
E) 145.90 amu
10.
A)
B)
C)
D)
E)
Which one of the following combinations of names and formulas is incorrect?
H3PO4 phosphoric acid
HNO3 nitric acid
NaHCO3 sodium carbonate
H2CO3 carbonic acid
KOH potassium hydroxide
11.
A)
B)
C)
D)
E)
What is the name of the acid formed when HClO4 liquid is dissolved in water?
hydrochloric acid
perchloric acid
chloric acid
chlorous acid
hydrochlorate acid
12. Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes.
What is its formula?
A) Fe(Cl⋅6H2O)3
B) Fe3Cl⋅6H2O
C) FeCl3(H2O)6
D) Fe3Cl(H2O)6
E) FeCl3⋅6H2O
13. The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches.
What is its name?
A) potassium chlorite
B) potassium chloride
C) potassium(I) chlorite
D) potassium(I) chlorate
E) potassium chlorate
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14.
A)
B)
C)
D)
E)
Calculate the molar mass of (NH4)3AsO4.
417.80 g/mol
193.03 g/mol
165.02 g/mol
156.96 g/mol
108.96 g/mol
15. Magnesium fluoride is used in the ceramics and glass industry. What is the mass of 1.72
mol of magnesium fluoride?
A) 43.3 g
B) 62.3 g
C) 74.5 g
D) 92.9 g
E) 107 g
16. Potassium dichromate, K2Cr2O7, is used in tanning leather, decorating porcelain and
water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K2Cr2O7.
A) 9.490 × 1025 Cr atoms
B) 2.248 × 1024 Cr atoms
C) 1.124 × 1024 Cr atoms
D) 3.227 × 1023 Cr atoms
E) 1.613 × 1023 Cr atoms
17.
A)
B)
C)
D)
E)
Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.
0.0217 g
0.139 g
7.21 g
12.7 g
46.0 g
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21. In the combustion analysis of 0.1127 g of glucose (C6H12O6), what mass, in grams, of
CO2 would be produced?
A) 0.0451 g
B) 0.0825 g
C) 0.1652 g
D) 0.4132 g
E) 1.466 g
Open ended problems: SHOW YOUR WORK!
27. An evacuated 276 mL glass bulb weighs 129.6375 g. Filled with an unknown gas, the
bulb weighs 130.0318 g. Calculate the gas density in g/L, and express it with an
appropriate number of significant figures.
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28. Fill in the blank spaces and write out all the symbols in the left hand column in full,in the
A
form Z X (i.e. include the appropriate values of Z and A as well as the correct symbol X).
Symbol
# protons
# neutrons
# electrons
17
18
Au
118
20
20
29. a. Give the names of the following ions:
(i) NH4+
(ii) SO32b. Write down the formulas of the following ions:
(i) aluminum
(ii) carbonate
30. For each of the following names, write down the corresponding formula, including charge
where appropriate (atomic numbers and mass numbers are not required):
a. zinc ion
b. nitrite ion
c. carbonic acid
d. cyanide ion
31. For each of the following elements, indicate next to the symbol whether it is a metal, a
non-metal or a metalloid:
a. S
b. Ge
c. Hg
d. H
e. I
f. Si
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Answer Key
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
C
A
B
B
B
E
B
E
C
C
B
E
E
B
E
D
E
A
B
D
C
A
C
C
A
a. 0.0444 mol DDT
b. Chlorobenzene is the limiting reagent.
c. 77.2%
27. 1.43 g/L
28. Symbol
# protons
# neutrons
35
17
Cl
197
79
40
20
17
18
# electrons
17
Au
79
118
79
Ca
20
20
20
29. a. (i) ammonium
(ii) sulfite
b. (i) Al3+
(ii) CO3230. a. Zn2+
b. NO2c.H2CO3
d.CN-
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31. a. nonmetal
b. metalloid
c. metal
d. nonmetal
e. nonmetal
f. metalloid
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