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Chemistry An Atoms First Approach 2e Steven Zumdahl Susan Zumdahl

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Chapter 1 - Chemical Foundations

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• Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112

contains:

• 49 protons, 63 neutrons, 49 electrons.
• 49 protons, 49 neutrons.
• 49 protons, 49 alpha particles.
• 49 protons, 63 neutrons.
• 49 protons, 112 neutrons.

ANSWER: d

POINTS: 1

• A hypothetical element consists of two isotopes of masses 78.95 amu and 80.95 amu with abundances of

32.9% and 67.1%, respectively. What is the average atomic mass of this element?

• 79.95 amu
• 78.95 amu
• 79.6 amu
• 80.3 amu
• 80.95 amu

ANSWER: d

POINTS: 1

• Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29

(28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic weight of X.

• 28.09 amu
• 48.63 amu
• 27.16 amu
• 28.97 amu
• 86.93 amu

ANSWER: a

POINTS: 1

• The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the other

stable isotope?a.

b.

c.

d.

e.

ANSWER: b

POINTS: 1

• Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 2 / 4

Chapter 1 - Chemical Foundations

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(28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). What is the identity of element X?

• Cu
• Al
• Ni
• Si
• Sr

ANSWER: d

POINTS: 1

• What is the mass of 6 atom(s) of copper in grams?
• 381.3 g
• 1.58 × 10

21 g

• 6.38 × 10

–24 g

• 6.022 × 10

23 g

• 6.33 × 10

–22 g

ANSWER: e

POINTS: 1

• You have a sample of zinc (Zn) and a sample of aluminum (Al). You have an equal number of atoms in each

sample. Which of the following statements concerning the masses of the samples is true?

• The mass of the zinc sample is more than twice as great as the mass of the aluminum sample.
• The mass of the zinc sample is more than the mass of the aluminum sample, but it is not twice as great.
• The mass of the aluminum sample is more than twice as great as the mass of the zinc sample.
• The mass of the aluminum sample is more than the mass of the zinc sample, but it is not twice as great.
• The masses of each sample are equal.

ANSWER: a

POINTS: 1

• has _____.
• 20 protons, 20 neutrons, and 18 electrons
• 22 protons, 20 neutrons, and 20 electrons
• 20 protons, 22 neutrons, and 18 electrons
• 22 protons, 18 neutrons, and 18 electrons
• 20 protons, 20 neutrons, and 22 electrons

ANSWER: a

POINTS: 1

• Which of the following statements is (are) true?

a.and have the same number of neutrons.b.and are isotopes of each other because their mass numbers are the same. 3 / 4

Chapter 1 - Chemical Foundations

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c.has the same number of electrons as .

• A and B
• A and C

ANSWER: e

POINTS: 1

• A species with 12 protons and 10 electrons is _____.
• Ne

2+

• Ti

2+

• Mg

2+

• Mg
• Ne

2–

ANSWER: c

POINTS: 1

• The numbers of protons, neutrons, and electrons in K

+

are:

• 20 p, 19 n, 19 e.
• 20 p, 19 n, 20 e.
• 19 p, 20 n, 20 e.
• 19 p, 20 n, 19 e.
• 19 p, 20 n, 18 e.

ANSWER: e

POINTS: 1

12. An ion is formed:

• by either adding or subtracting protons from the atom.
• by either adding or subtracting electrons from the atom
• by either adding or subtracting neutrons from the atom.
• all of the above are true.
• two of the above are true.

ANSWER: b

POINTS: 1

13. All of the following are true except:

• ions are formed by adding electrons to a neutral atom.
• ions are formed by changing the number of protons in an atom's nucleus.
• ions are formed by removing electrons from a neutral atom.
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