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Midterm

Exam 3Exam


Department
Chemistry
Course Code
CHM 113
Professor
All
Study Guide
Midterm

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Sample Exam 3
Copyright by James P. Birk page 1
Multiple Choice (4 points each): Answer on blue form; be sure to code in your name
and ID.
1. The Bohr model of the atom works reasonably well in the calculation of energy
levels in hydrogen. What other systems can be described by this model?
a. only hydrogen and helium
b. any one electron system
c. all elements in the lithium family
d. only hydrogen
e. all elements in the helium family
2. Which of the following statements are true?
1. An excited atom can return to a lower energy level by absorbing light energy.
2. An atom can be excited by emitting light energy.
3. As the energy of electromagnetic radiation increases, its frequency increases.
4. The frequency and wavelength of light are inversely proportional.
a. 2 and 3
b. 1 and 3
c. 1 and 2
d. 3 and 4
e. 2 only
3. Which statement best describes the path of an electron as it moves in a p orbital?
a. It has a high probability of being somewhere within a dumbbell-shaped orbital.
b. It travels in an orbit around the nucleus.
c. It travels around the nucleus in a figure-eight on the surface of a spherical
orbital.
d. It is found randomly around the nucleus within a spherical orbital.
e. It is contained within a dumbbell-shaped orbital.
4. What is the total number of orbitals associated with the n = 3 level?
a. 9
b. 6
c. 3
d. 18
e. 5
5. Which of the following atomic orbital designations is impossible?
a. 2p
b. 3s
c. 4f
d. 2d
e. 2s
Answers
1. b
2. d
3. a
4. a
5. d
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Sample Exam 3
Copyright by James P. Birk page 2
6. Which of the following electronic configurations represents a diamagnetic atom?
1s 2s 2p
a. ↑↓ ↑↓↑
_ __ __
b. ↑↓ ↑↓↑
_ _ _
c. ↑↓ ↑__ __ __
d. ↑↓ ↑↓↑
_ _ __
e. ↑↓ ↑↓↑ _ _
7. The ground-state electron configuration of oxygen is
a. 1s2 2s2 2p4
b. 1s2 2s2 2p3
c. 1s2 2s2 2p6
d. 1s2 2s2 2p5
e. 1s2 2s2 2p4 3s1
8. The electron configuration of chromium as an ion is [Ar] 3d4. What is the charge on
this chromium ion?
a. 2+
b. 3-
c. 3+
d. 2-
e. 4+
9. Manganese is in the 2+ state. How many 3d orbitals are empty?
a. 4
b. 2
c. 1
d. 0
e. 3
10. In an isoelectronic series the size of the particles decreases as
a. shielding decreases
b. nuclear charge decreases
c. pairing energy increases
d. nuclear charge increases
e. shielding increases
11. Which of the following elements has the highest first ionization energy?
a. Li
b. Na
c. K
d. Rb
e. Be
6. c
7. a
8. a
9. d
10. d
11. e
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