Test Bank For r r r
Chemistry An r r r
Atoms First r r r
Approach, 3rd
r r r
Edition Steven S.
r r r r
r Zumdahl (Author), r r
Susan A. Zumdahl
r r r r
r (Author), Donald J. r r r
DeCoste (Author)
r r r
Chapter 1-21 r r
,Chapter1 -Chemical Foundations
r r r r
1. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112
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contains:
r
a. 49 protons, 63 neutrons, 49 electrons.
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b. 49 protons, 49 neutrons. r r r
c. 49 protons, 49 alpha particles. r r r r
d. 49 protons, 63 neutrons. r r r
e. 49 protons, 112 neutrons. r r r
ANSWER: d
POINTS: 1
2. Ahypothetical element consists oftwo isotopes ofmasses 78.95 amu and 80.95 amu with abundances of
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32.9% and 67.1%, respectively. What is the average atomic mass of this element?
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a. 79.95 amu r
b. 78.95 amu r
c. 79.6 amu r
d. 80.3 amu r
e. 80.95 amu r
ANSWER: d
POINTS: 1
3. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29
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(28.976amu, 4.67% abundance), and X-30 (29.974amu, 3.10% abundance). Calculate the atomic weight ofX.
r r r r r r r r r r r r r r r r
a. 28.09 amu r
b. 48.63 amu r
c. 27.16 amu r
d. 28.97 amu r
e. 86.93 amu r
ANSWER: a
POINTS: 1
4. The atomic mass of rhenium is 186.2. Given that 37.1% ofnatural rheniumis rhenium-185, what is the other
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stable isotope?
r r
a.
b.
c.
d.
e.
ANSWER: b
POINTS: 1
5. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29
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,Chapter1 -Chemical Foundations
r r r r
(28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). What is the identity of element X?
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a. Cu
b. Al
c. Ni
d. Si
e. Sr
ANSWER: d
POINTS: 1
6. What is the mass of 6 atom(s) of copper in grams?
r r r r r r r r r r
a. 381.3 g r
b. 1.58 × 1021 g r r
r
c. 6.38 × 10–24 g r r
r
d. 6.022 × 1023 g r r
r
e. 6.33 × 10–22g r r
ANSWER: e
POINTS: 1
7. Youhave a sample of zinc (Zn) and a sample of aluminum (Al). Youhave an equal number ofatoms in each
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sample. Which of the following statements concerning the masses of the samples is true?
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a. The mass of the zinc sample is more than twice as great as the mass of the aluminum sample.
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b. The mass of the zinc sample is more than the mass of the aluminum sample, but it is not twice as great.
r r r r r r r r r r r r r r r r r r r r r
c. The mass of the aluminum sample is more than twice as great as the mass of the zinc sample.
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d. The mass of the aluminum sample is more than the mass of the zinc sample, but it is not twice as great.
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e. Themasses of each sample are equal.
r r r r r r
ANSWER: a
POINTS: 1
8. has .
a. 20 protons, 20 neutrons, and 18 electrons
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b. 22 protons, 20 neutrons, and 20 electrons
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c. 20 protons, 22 neutrons, and 18 electrons
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d. 22 protons, 18 neutrons, and 18 electrons
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e. 20 protons, 20 neutrons, and 22 electrons
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ANSWER: a
POINTS: 1
9. Whichofthe following statements is (are) true? a.
r r r r r r r r
and haverthersamernumber rof rneutrons.
b.
and are risotopesrof reach rother rbecause rtheir rmassrnumbers rarerthe rsame.
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, Chapter1 -Chemical Foundations
r r r r
c.
hasrthe rsame rnumber rof relectrons ras .
d. A randrB
e. A rand rC
ANSWER: e
POINTS: 1
10. Aspecies with 12 protons and 10 electrons is
r r r r r r r r .
a. Ne2+
b. Ti2+
c. Mg2+
d. Mg
e. Ne2–
ANSWER: c
POINTS: 1
11. The numbers of protons, neutrons, and electrons in
r r r r r r r K+ are: r
a. 20 p, 19 n, 19 e. r r r r r
b. 20 p, 19 n, 20 e. r r r r r
c. 19 p, 20 n, 20 e. r r r r r
d. 19 p, 20 n, 19 e. r r r r r
e. 19 p, 20 n, 18 e. r r r r r
ANSWER: e
POINTS: 1
12. An ion is formed:
r r r
a. by either adding or subtracting protons from the atom.
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b. by either adding or subtracting electrons from the atom
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c. by either adding or subtracting neutrons from the atom.
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d. all of the above are true. r r r r r
e. two of the above are true. r r r r r
ANSWER: b
POINTS: 1
13. All ofthe following aretrue except:
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a. ions are formed by adding electrons to a neutral atom.
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