CHEMISTRY 110 EXAM 1
SEPTEMBER 20, 2010
FORM A
----------------------------------------------------------------------------------------1. What are the correct numbers of protons, neutrons and electrons in a
39 +
K ion?
A.
p n
20 19
e
18
B.
20
19
19
C.
19
20
18
D.
19
20
19
E.
20
19
20
----------------------------------------------------------------------------------------2. Which set of quantum numbers is not permissible for an electron in an
atom?
A. n = 6,  = 1, m = 0
B. n = 3,  = 2, m = 3
C. n = 3,  = 2, m = −2
D. n = 1,  = 0, m = 0
E. n = 4,  = 3, m = −3
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----------------------------------------------------------------------------------------3. Of the atoms below, which one is the most electronegative?
A. Si
B. Cl
C. Rb
D. Ca
E. S
----------------------------------------------------------------------------------------4. Which of the following ionization processes requires the most energy?
A. He → He+ + e−
B. Be → Be+ + e−
C. Na → Na+ + e−
D. Mg → Mg+ + e−
E. Fe → Fe+ + e−
----------------------------------------------------------------------------------------5. Which of the following statements is true?
A. Ultraviolet light has a longer wavelength than infrared.
B. Red light has a higher frequency than blue light.
C. The wavelength of visible light is directly proportional to its
frequency.
D. X-ray has lower energy than microwave.
E. Radio waves have a longer wavelength than visible light.
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----------------------------------------------------------------------------------------6. Which of the following could be an orbital diagram for a neutral carbon
atom in an excited state?
1s
2s
2p
A.
(↑↓)
(↑↓)
(↑ ) (↑ ) (
B.
(↑↓)
(↑ )
(↑ ) (↑ ) (↑ )
C.
(↑↓)
(↑↓)
(↑ ) (↑ ) (↑ )
D.
(↑↓)
(↑↓↑)
(↑ ) ( ) ( )
E.
(↑↓)
(↑↓)
(↑ ) ( ) ( )
)
----------------------------------------------------------------------------------------7. How many electrons have the quantum number m = 0 in the ground-state
electron configuration of neon (Ne)?
A. 2
B. 4
C. 6
D. 8
E. 10
----------------------------------------------------------------------------------------8. What is the energy change when an electron in a hydrogen atom is
promoted from n = 2 to n = 5?
A. –276 kJ
B. –6.45 × 10−19 J
C.
6.45 × 10−19 J
D. –4.58 × 10−19 J
E.
4.58 × 10−19 J
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----------------------------------------------------------------------------------------9. Consider the highest energy electron in the ground-state electron
configuration of barium (Ba). Identify the shape of the orbital
occupied by this electron.
A.
C.
B.
D.
E.
----------------------------------------------------------------------------------------10. How many unpaired electrons are there in the ground-state electron
configuration of Co?
A. 1
B. 2
C. 3
D. 4
E. 5
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----------------------------------------------------------------------------------------11. All orbitals in a given subshell have the same value(s) of the
_________.
i.
ii.
iii.
iv.
A.
B.
C.
D.
E.
quantum number n
quantum number 
quantum number m
energy
iii and iv
i, ii, and iii
i and ii
ii and iv
i, ii, and iv
----------------------------------------------------------------------------------------12. Which one of the following is a true statement?
A. Electronegativity is the ability of an atom in a molecule to lose
electrons.
B. Electron pairs are shared equally in a polar covalent bond.
C. Transition metals lose their valence d electrons before valence s
electrons.
D. The effective nuclear charge increases as we move to the right
across any row of the periodic table.
E. Electron pairs are shared between atoms in an ionic bond.
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----------------------------------------------------------------------------------------13. Arrange the ions Te2−, I−, Rb+, and Sr2+ in order of decreasing size.
A. Sr2+ > Rb+ > I− > Te2−
B. I− > Rb+ > Te2− > Sr2+
C. Te2− > I− > Rb+ > Sr2+
D. Te2− > Sr2+ > I− > Rb+
E. Rb+ > Sr2+ > I− > Te2−
----------------------------------------------------------------------------------------14. In which of the following subshells of a Bi atom does an electron
experience the greatest effective nuclear charge?
A. 3f
B. 3p
C. 3d
D. 3s
E. 4s
----------------------------------------------------------------------------------------15. Which one of the following elements has the most negative electron
affinity?
A.
B.
C.
D.
E.
Na
Mg
S
Cl
Ne
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----------------------------------------------------------------------------------------16. Element M reacts with chlorine to form a compound with the formula MCl2. Element M is more reactive than magnesium and has a smaller
radius than barium. Which one of the following can be element M?
A. Sr
B. K
C. Na
D. Ra
E. Be
----------------------------------------------------------------------------------------17. What is the ground-state electron configuration for the Fe2+ ion?
A. [Ar] 3d6
B. [Ar] 4s23d4
C. [Ar] 3d8
D. [Ar] 4s23d8
E. [Ar] 4s23d6
----------------------------------------------------------------------------------------18. What is the formal charge on nitrogen in the “best” Lewis structures for
the nitrate anion, NO3−?
A.
B.
C.
D.
E.
−1
0
+1
+2
−2
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----------------------------------------------------------------------------------------19. Which of the following is the best Lewis structure for ICl4−?
A.
B.
C.
D.
E.
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----------------------------------------------------------------------------------------20. How many nonbonding electron pairs are on N and C in the Lewis
structure of HCN (H bonded to C)?
Nonbonding
electron pairs on
A.
C
0
N
1
B.
1
0
C.
1
1
D.
1
2
E.
2
1
----------------------------------------------------------------------------------------21. List the following subshells found in a neutral many-electron atom in
order of increasing electron energy.
4s, 3s, 4p, 3d, 5s
A. 5s < 4s < 3s < 4p < 3d
B. 3s < 3d < 4s < 4p < 5s
C. 3s = 3d < 4s = 4p < 5s
D. 3s < 4s < 3d < 5s < 4p
E. 3s < 4s < 3d < 4p < 5s
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----------------------------------------------------------------------------------------22. The energy level diagram for a hypothetical one-electron atom is
shown below. Which energy level represents the ground state and which
transition corresponds to emission of light with the longest wavelength?
A. ground state is E, transition is A → E
B. ground state is A, transition is A → B
C. ground state is E, transition is B → C
D. ground state is E, transition is D → E
E. ground state is A, transition is E → A
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----------------------------------------------------------------------------------------23. What is the frequency of the wave shown below assuming it is light
(electromagnetic radiation)?
A. 3.8 × 1015 s−1
B. 0.19 s−1
C. 3.8 × 1014 s−1
D. 1.9 × 10−14 s−1
E. 1.1 × 10−19 s−1
----------------------------------------------------------------------------------------24. The energy of a pulse of green light (λ= 532 nm) is 1.92 × 10−3 J. How
many photons are in the pulse?
A. 3.63 × 103
B. 5.21 × 103
C. 5.14 × 1015
D. 1.16 × 1021
E. 1.57 × 1024
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----------------------------------------------------------------------------------------25. Cl in nature is composed of two isotopes of 35Cl (34.969 amu) and
37
Cl (36.966 amu). Based on the average mass of Cl, 35.453 amu,
what is the content of 35Cl in natural Cl?
A. 24%
B. 32%
C. 68%
D. 76%
E. 132%
----------------------------------------------------------------------------------------26. Which of the following ions can be drawn with only two equivalent
resonance structures?
(i) NO2−
(ii) NO3− (iii) SO32− (iv) BrO3−
A. (i) only
B. (ii) only
C. (ii) and (iii)
D. (i) and (ii)
E. (iv)
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----------------------------------------------------------------------------------------27. Rank the following ions in order of decreasing N-O bond length:
NO+
A. NO+
NO2−
NO3−
> NO2− > NO3−
B. NO3− > NO2− > NO+
C. NO3− = NO2− > NO+
D. NO+
> NO3− > NO2−
E. NO+
> NO2− = NO3−
----------------------------------------------------------------------------------------28. Which one of the following will have the largest lattice energy?
A. TiF2
B. TiCl2
C. TiF3
D. TiCl3
E. TiCl4
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End of Test
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CHEMISTRY 110 EXAM 1
SEPTEMBER 20, 2010
Answer Key
FORM A
1. C
2. B
3. B
4. A
5. E
6. B
7. C
8. E
9. A
10. C
11. E
12. D
13. C
14. D
15. D
16. A
17. A
18. C
19. A
20. A
21. E or B
22. C
23. A
24. C
25. D
26. A
27. B
28. E