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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Which of the following
statements concerning Marie Curie are correct?
1. | Marie Curie isolated polonium and
radium. | 2. | Marie Curie discovered that uranium emits neutrons when it
decays. | 3. | Marie Curie suggested that certain atoms disintegrate, emitting
unusual rays. She named the phenomenon radioactivity. | | |
a. | 1 only | b. | 2 only | c. | 3 only | d. | 1 and 2 | e. | 1 and 3 | | |
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2.
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What is the atomic symbol for
an element that has 30 neutrons and a mass number of 55?
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3.
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Which of the following atoms
contains the largest number of protons? a. | 158Gd | b. | 157Tb | c. | 127I | d. | 138Ba | e. | 144Nd | | |
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4.
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Which of the following atoms
contains the largest number of neutrons?
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5.
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Silver has an average atomic
mass of 107.87 u. If 48.18% of Ag exists as Ag-109 (108.9047 u), what is the identity and the atomic
mass of the other isotope? a. | Ag-106; 106.9 u | b. | Ag-107; 106.9 u | c. | Ag-107; 107.9 u | d. | Ag-108; 107.9 u | e. | Ag-108; 108.9 u | | |
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6.
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Lithium has two stable isotopes
with masses of 6.01512 u and 7.01600 u. The average molar mass of Li is 6.941 u. What is the percent
abundance of each isotope? a. | 7.49% Li-6 and 92.51%
Li-7 | b. | 9.18% Li-6 and 90.813% Li-7 | c. | 12.2% Li-6 and 87.78% Li-7 | d. | 50.00% Li-6 and 50.00%
Li-7 | e. | 62.99% Li-6 and 37.01% Li-7 | | |
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7.
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What is the mass of 0.25 mol
Zn? a. | 3.8 × 10-3
g | b. | 0.061 g | c. | 7.3 g | d. | 16 g | e. | 2.6 ×
102 g | | |
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8.
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The molar mass of carbon is
12.01 g/mole. What is the mass of a 1.0 ×
109 carbon atoms? a. | 1.4 ×
10-16 g | b. | 2.0 ×
10-14 g | c. | 1.2 ×
10-8 g | d. | 8.3 ×
107 g | e. | 7.2 ×
1015 g | | |
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9.
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All of the following are
possible quantities EXCEPT a. | a gold coin with a mass of 0.0031
kg. | b. | aluminum foil that is 2.0 ×
10-2 cm thick. | c. | 2.0 ×
10-22 grams He. | d. | 1.0 ×
10-24 mol C. | e. | 22 atoms of Bi. | | |
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10.
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Four elements constitute over
95% of the human body. These four elements are a. | iron, calcium, carbon, and
sodium. | b. | phosphorus, carbon, nitrogen, and sodium. | c. | sodium, calcium, carbon, and iron. | d. | magnesium, oxygen, nitrogen, and hydrogen. | e. | oxygen, carbon, hydrogen, and nitrogen. | | |
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