Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
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1.
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A(n) ____ is a pure substance
that is composed of only one type of atom. a. | element | b. | homogeneous mixture | c. | heterogeneous
mixture | d. | macroscopic particle | e. | particulate | | |
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2.
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Which of the following
substances is an element? a. | CO | b. | S8 | c. | NaCl | d. | C6H12O6 | e. | CO2 | | |
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3.
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The molecular model below
depicts a molecule composed of carbon (black), oxygen (gray), and hydrogen (white) atoms. What is the
correct molecular formula?
a. | CHO | b. | C6H6O2 | c. | C6H7O | d. | C7H6O | e. | C7H6O2 | | |
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4.
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You can identify a metal by
carefully determining its density. A 2.166 g piece of an unknown metal is 1.50 cm long, 0.550 cm
wide, and 0.250 cm thick. What is a possible identity of the element? a. | silver, 10.5 g/cm3 | b. | iridium, 22.4 g/cm3 | c. | platinum, 21.4 g/cm3 | d. | palladium, 12.0 g/cm3 | e. | none of the above | | |
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5.
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All of the following are
examples of intensive properties EXCEPT a. | melting point. | b. | color. | c. | volume. | d. | density. | e. | boiling point. | | |
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6.
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The wavelength of light emitted
from a green laser pointer is 5.32 ×
102 nm. What is the wavelength in meters? a. | 5.32 × 10-9
m | b. | 5.32 ×
10-7 m | c. | 5.32 ×
10-5 m | d. | 5.32 ×
10-3 m | e. | 5.32 ×
10-1 m | | |
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7.
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At 25 °C, the density of oxygen in air is 0.275 g/L. What volume is occupied by 25 kg of
oxygen at 25 °C? a. | 1.1 × 10-5
L | b. | 6.9 L | c. | 2.8 ×
102 L | d. | 6.9 ×
103 L | e. | 9.1 ×
104 L | | |
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8.
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What is the correct answer to
the following expression: (18 + 95) ×
0.077351? Carry out the addition operation first. a. | 8.7 | b. | 8.74 | c. | 8.741 | d. | 8.7407 | e. | 8.74066 | | |
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9.
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What is the correct answer to
the following expression: 2.97 × 10-5 + 6.13 × 10-3? a. | 6.1 ×
10-3 | b. | 6.16 ×
10-3 | c. | 6.160 ×
10-3 | d. | 6.1597 ×
10-3 | e. | 6.15970 × 10-5 | | |
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10.
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The radius of a lithium atom is
152 pm. What is the volume of a lithium atom is cubic centimeters? The volume of a sphere is
(4/3)πr3. a. | 1.47 × 10-27
cm3 | b. | 1.47 ×
10-23 cm3 | c. | 1.47 ×
10-20 cm3 | d. | 1.47 ×
10-14 cm3 | e. | 1.47 ×
107 cm3 | | |
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