Test Bank For
Chemistry An
Atoms First
Approach, 3rd
Edition Steven S.
Zumdahl (Author),
Susan A. Zumdahl
(Author), Donald J.
DeCoste (Author)
Chapter 1-21
,Chapter 1 - Chemical Foundations
f f f f
1. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112
f f f f f f f f f f f f f f f f f
contains:
f
a. 49 protons, 63 neutrons, 49 electrons.
f f f f f
b. 49 protons, 49 neutrons. f f f
c. 49 protons, 49 alpha particles. f f f f
d. 49 protons, 63 neutrons. f f f
e. 49 protons, 112 neutrons. f f f
ANSWER: d
POINTS: 1
2. A hypothetical element consists of two isotopes of masses 78.95 amu and 80.95 amu with abundances of
f f f f f f f f f f f f f f f f
32.9% and 67.1%, respectively. What is the average atomic mass of this element?
f f f f f f f f f f f f f
a. 79.95 amu f
b. 78.95 amu f
c. 79.6 amu f
d. 80.3 amu f
e. 80.95 amu f
ANSWER: d
POINTS: 1
3. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29
f f f f f f f f f f f f f f
(28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic weight of X.
f f f f f f f f f f f f f f f f
a. 28.09 amu f
b. 48.63 amu f
c. 27.16 amu f
d. 28.97 amu f
e. 86.93 amu f
ANSWER: a
POINTS: 1
4. The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the other
f f f f f f f f f f f f f f f f f f
stable isotope?
f f
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
f f f f f f f f f f f f f f
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,Chapter 1 - Chemical Foundations
f f f f
(28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). What is the identity of element X?
f f f f f f f f f f f f f f f f
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?
f f f f f f f f f f
a. 381.3 g f f
b. 1.58 × 1021 g f f f
c. 6.38 × 10–24 g f f f
d. 6.022 × 1023 g f f f
e. 6.33 × 10–22g f f
ANSWER: e
POINTS: 1
7. You have a sample of zinc (Zn) and a sample of aluminum (Al). You have an equal number of atoms in each
f f f f f f f f f f f f f f f f f f f f f
sample. Which of the following statements concerning the masses of the samples is true?
f f f f f f f f f f f f f f
a. The mass of the zinc sample is more than twice as great as the mass of the aluminum sample.
f f f f f f f f f f f f f f f f f f
b. The mass of the zinc sample is more than the mass of the aluminum sample, but it is not twice as great.
f f f f f f f f f f f f f f f f f f f f f
c. The mass of the aluminum sample is more than twice as great as the mass of the zinc sample.
f f f f f f f f f f f f f f f f f f
d. The mass of the aluminum sample is more than the mass of the zinc sample, but it is not twice as great.
f f f f f f f f f f f f f f f f f f f f f
e. The masses of each sample are equal.
f f f f f f
ANSWER: a
POINTS: 1
8. has .
a. 20 protons, 20 neutrons, and 18 electrons
f f f f f f
b. 22 protons, 20 neutrons, and 20 electrons
f f f f f f
c. 20 protons, 22 neutrons, and 18 electrons
f f f f f f
d. 22 protons, 18 neutrons, and 18 electrons
f f f f f f
e. 20 protons, 20 neutrons, and 22 electrons
f f f f f f
ANSWER: a
POINTS: 1
9. Which of the following statements is (are) true?
f f f f f f f
a. f
and have the same number of neutrons.
f f f f f
b.
and are isotopes of each other because their mass numbers are the same.
f f f f f f f f f f f
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, Chapter 1 - Chemical Foundations
f f f f
c.
has the same number of electrons as f f f f f f .
d. f A and B
f f
e. A and C f f f
ANSWER: e
POINTS: 1
10. A species with 12 protons and 10 electrons is
f f f f f f f f .
a. Ne2+
b. Ti2+
c. Mg2+
d. Mg
e. Ne2–
ANSWER: c
POINTS: 1
11. The numbers of protons, neutrons, and electrons in
f f f f f f f K+ are: f
a. 20 p, 19 n, 19 e. f f f f f f
b. 20 p, 19 n, 20 e. f f f f f
c. 19 p, 20 n, 20 e. f f f f f
d. 19 p, 20 n, 19 e. f f f f f
e. 19 p, 20 n, 18 e. f f f f f
ANSWER: e
POINTS: 1
12. An ion is formed:
f f f
a. by either adding or subtracting protons from the atom.
f f f f f f f f
b. by either adding or subtracting electrons from the atom
f f f f f f f f
c. by either adding or subtracting neutrons from the atom.
f f f f f f f f
d. all of the above are true. f f f f f
e. two of the above are true. f f f f f
ANSWER: b
POINTS: 1
13. All of the following are true except:
f f f f f f
a. ions are formed by adding electrons to a neutral atom.
f f f f f f f f f
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