CHEMISTRY 110 EXAM 1
February 9, 2011
FORM A
--------------------------------------------------------------------------------4. Which bond in the following molecule is the most polar?
--------------------------------------------------------------------------------1. What is the chemical formula of ammonium carbonate?
A. (NH4)2CO3
B. (NH4)HCO3
C. (NH3)HCO3
D. (NH3)(CO3)2
--------------------------------------------------------------------------------2. Which of the following has the largest ionization energy?
A. Al
B. Sr
C. In
D. P
E. As
--------------------------------------------------------------------------------3. Which of the following is a possible set of quantum
numbers for an electron in an atom?
n=3
n=0
n=4
n=3
n=4
!
!
!
!
!
=2
=0
=2
=1
= –3
C!H
C!Cl
C!Br
C!O
C!F
--------------------------------------------------------------------------------5. Which one of the following is the most electronegative
element?
E. (NH4)(CO3)2
A.
B.
C.
D.
E.
A.
B.
C.
D.
E.
m!
m!
m!
m!
m!
= –3
= 0
= –1
= –1
= –1
ms = +1/2
ms = +1/2
ms = 0
ms = +1/2
ms = +1/2
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A.
B.
C.
D.
E.
Ca
Si
O
Al
Ba
--------------------------------------------------------------------------------6. Which one of the following electron transitions in a
hydrogen atom results in the emission of the highest
energy photon?
A.
B.
C.
D.
E.
n = 6 to n = 2
n = 2 to n = 6
n = 5 to n = 1
n = 1 to n = 5
n = 3 to n = 6
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--------------------------------------------------------------------------------7. Which of the orbitals shown below could have the
quantum numbers n = 4, ! = 2?
A.
B.
C.
D.
E.
1 only
2 only
4 and 5
2, 4 and 5
1, 2, 4 and 5
--------------------------------------------------------------------------------8. Consider the general valence electron configuration of
ns2np5. Which statement/statements is/are true?
(i)
Elements with this electron configuration are
expected to form "1 anions.
(ii) Elements with this electron configuration are
expected to have large positive electron affinities.
(iii) Elements with this electron configuration are
nonmetals.
A. (i),(ii)
B. (i),(iii)
C. (ii),(iii)
D. (i)
E. (i),(ii),(iii)
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--------------------------------------------------------------------------------9. Which of the following species has 28 electrons?
I. Zn2+
II. Ni
III. Cu+
A.
B.
C.
D.
E.
I only
II only
Both I and II
Both II and III
All of them.
--------------------------------------------------------------------------------10. The natural abundance of 79Br is 54.8%. What is the
atomic weight of the only other isotope of Br?
A.
B.
C.
D.
E.
77
78
80
81
82
--------------------------------------------------------------------------------11. The bond energy of a CI!Cl bond is 242 kJ/mol. What
is the maximum wavelength of light that can be used to
break a CI!Cl bond by absorption of a single photon?
A.
B.
C.
D.
E.
495 nm
1547 nm
143 nm
210 nm
0.501 nm
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--------------------------------------------------------------------------------12. In which orbital does an electron in a phosphorus atom
experience the greatest effective nuclear charge?
A.
B.
C.
D.
E.
1s
2s
2p
3s
3p
--------------------------------------------------------------------------------13. The energy level diagram for a hypothetical one-electron
quantum system is shown below. Assuming these are
the only possible energy levels, how many lines would
there be in the emission line spectrum?
--------------------------------------------------------------------------------14. Lattice energy is an important property that tells us
about the stability of an ionic compound. It cannot be
determined directly by experiment. However, we can
estimate it. Which one of the following compounds
should have the lowest lattice energy?
A.
B.
C.
D.
E.
--------------------------------------------------------------------------------15. Which of these compounds is not ionic?
A.
B.
C.
D.
E.
A.
B.
C.
D.
E.
4
7
9
10
15
---------------------------------------------------------------------------------
CaS
NaCl
MgS
AlN
RbBr
NaCl
BaCl2
CsF
SF2
CaBr2
--------------------------------------------------------------------------------16. How many unpaired electrons does Fe+3 have in the
ground state?
A.
B.
C.
D.
E.
1
2
3
4
5
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--------------------------------------------------------------------------------17. Which of the following diagrams represents the ground
state valence electron configuration of sulfur?
--------------------------------------------------------------------------------19. Which of the following electron configurations is possible
for valence electrons of nitrogen (ground state or excited
state)?
A
i
3s
3p
2s
2p
2s
2p
2s
2p
ii
B
3s
3p
iii
C
3s
3p
3s
3p
3s
3p
A.
B.
C.
D.
E.
D
E
--------------------------------------------------------------------------------18. Which of the following is/are isoelectronic with Mg2+?
i.
ii.
iii.
iv.
A.
B.
C.
D.
E.
--------------------------------------------------------------------------------20. Which of the following variations in atomic radii is
correct?
F
N3!
Cl!
Na+
ii only
iv only
i, ii and iv
ii and iii
ii and iv
---------------------------------------------------------------------------------
i only
ii only
i and ii
ii and iii
all three are correct
i. B < C < N
ii. N < P < As
iii. F < O < S
A.
B.
C.
D.
E.
i only
ii only
i and ii
ii and iii
all three are correct
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--------------------------------------------------------------------------------21. A laser emits light with an energy of 2.25 " 105 J/mol of
photons. Given the visible light portion of the
electromagnetic spectrum below, what color would this
laser most likely emit?
400 nm
Violet
A.
B.
C.
D.
E.
Wavelength
500 nm
600 nm
Blue
Green Yellow Orange
700 nm
Red
violet
blue
green
yellow
red
--------------------------------------------------------------------------------22. What is the formal charge on the N atom in the nitrate
ion NO3"?
A.
B.
C.
D.
E.
--------------------------------------------------------------------------------23. Which one of the following pairs of Lewis structures
represents resonance?
"1
"2
0
+1
+2
--------------------------------------------------------------------------------24. Which molecule(s) violate the octet rule?
i
NO
ii
SbF5
iii
AlH3
A. i only
B. ii only
C. iii only
D. i and ii
E. All of the above
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--------------------------------------------------------------------------------25. Rank these in order of increasing N!O bond length,
starting with the shortest.
A. NO" < NO2" < NO3"
B. NO2" < NO" < NO3"
C. NO3" < NO" < NO2"
D. NO3" < NO2" < NO"
E. NO" < NO3" < NO2"
--------------------------------------------------------------------------------26. How many electrons with quantum number m! = 1 are
there in the ground state of xenon?
A. 8
B. 9
--------------------------------------------------------------------------------27. What is the frequency of the photon absorbed when an
electron in a hydrogen atom goes from the n= 2 level to
the n = 4 level?
A. 6.17 # 1014 s"1
B. 2.18 # 1018 s"1
C. 4.09 # 1014 s"1
D. 5.45 # 1014 s"1
E. 8.22 # 1014 s"1
--------------------------------------------------------------------------------28. Rank these systems in order of increasing electrostatic
potential energy.
I
an electron that is 2.8 nm from a +2 charge
II
an electron that is 2.8 nm from a "2 charge
III
an electron that is 2.8 nm from a proton
C. 10
A. I < III < II
D. 11
B. I = II < III
E. 12
C. II < III < I
D. I = II = III
E. III < II = I
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--------------------------------------------------------------------------------END OF TEST
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CHEMISTRY 110 EXAM 1
February 9, 2011
Answer Key
FORM A
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
A
D
D
E
C
C
D
B
E
D
A
A
D
E
D
E
D
E
D
D
C
D
C
E
A
E
A
A