Final Exam
135 Points
Name:____________________
Date: _______________
1. (20 points) for the CO32- and ICl2+ ions give the following
a. Lewis structure
b. AXE notation
c. Electronic geometry
d. Molecular geometry
e. Bond angles
f. Sketch molecule in 3-D
g. Indicate the hybridization
h. Indicate if the molecule has polar bonds (if so how many?)
i. Indicate whether the entire molecule is polar or non polar
(57 Points, 3 points each) Multiple choice. Show your work for partial credit
2. The molecular geometry of the H3O+ ion is __________.
A) linear
B) tetrahedral
C) bent
D) trigonal pyramidal
E) octahedral
Answer: D
3. The molecular geometry of the CS2 molecule is __________.
A) linear
B) bent
C) tetrahedral
D) trigonal planar
E) T-shaped
Answer: A
4. The molecular geometry of the CHCl3 molecule is __________.
A) bent
B) trigonal planar
C) trigonal pyramidal
D) tetrahedral
E) T-shaped
Answer: D
5. The molecular geometry of the SF2 molecule is __________.
A) linear
B) bent
C) trigonal planar
D) tetrahedral
E) octahedral
Answer: B
6. The O–S–O bond angle in SO 2 is slightly less than __________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°
Answer: C
7. The F–N–F bond angle in the NF3 molecule is slightly less than __________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°
Answer: B
8. The hybridization of the carbon atom in carbon dioxide is __________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d 2
Answer: A
9. There are __________ σ and __________ π bonds in the H–C≡C–H molecule.
A) 3 and 2
B) 3 and 4
C) 4 and 3
D) 2 and 3
E) 5 and 0
Answer: A
10. There are __________ σ and __________ π bonds in the H2C=C=CH2 molecule.
A) 4, 2
B) 6, 4
C) 2, 2
D) 2, 6
E) 6, 2
Answer: E
11. The total number of π bonds in the H–C≡C–C≡C–C≡N molecule is __________.
A) 3
B) 4
C) 6
D) 9
E) 12
Answer: C
12. There is/are __________ σ bond(s) in the molecule below.
A) 1
B) 2
C) 12
D) 13
E) 18
Answer: C
13. There is/are __________ π bond(s) in the molecule below.
A) 0
B) 1
C) 2
D) 4
E) 16
Answer: C
14. The molecular geometry of the left-most carbon atom in the molecule below is __________.
A) trigonal planar
B) trigonal bipyramidal
C) tetrahedral
D) octahedral
E) T-shaped
Answer: C
15. The molecular geometry of the right-most carbon in the molecule below is __________.
A) trigonal planar
B) trigonal bipyramidal
C) tetrahedral
D) octahedral
E) T-shaped
Answer: A
16. The hybridization of the carbon atom labeled x in the molecule below is __________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d 2
Answer: B
17. The Lewis structure of carbon dioxide is given below. The hybridization of the carbon atom
in carbon dioxide is __________.
A) sp3
B) sp2
C) sp
D) sp2d
E) sp2d 2
Answer: C
18. A 2.25-g sample of magnesium nitrate, Mg(NO3)2, contains __________ mol of this
compound.
A) 38.4
B) 65.8
C) 148.3
D) 0.0261
E) 0.0152
Answer: E
19. Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar?
A) Mg > Na > P > Si > Ar
B) Ar > Si > P > Na > Mg
C) Si > P > Ar > Na > Mg
D) Na > Mg > Si > P > Ar
E) Ar > P > Si > Mg > Na
Answer: D
20. The list that correctly indicates the order of metallic character is __________.
A) B > N > C
B) F > Cl > S
C) Si > P > S
D) P > S > Se
E) Na > K > Rb
Answer: C
21. (16 points) A Lewis structure for SO2 is shown.
O
S
O
Based on the Lewis structure shown and the VSEPR model, answer the following questions.
A. (4 pts) What is the electronic geometry?
a. linear
pyramidal
b. bent
c. trigonal planar
d. trigonal
c. trigonal planar
d. trigonal
B. (4 pts) What is the molecular geometry?
a. linear
pyramidal
b. bent
C. (4 pts) What is the approximate O–S–O bond angle?
a. 90˚
b. 109.5˚
c. 120˚
d. 180˚
D. (4 pts) Given that the S-O bond is polar, which of the following describes the SO2
molecule?
a. polar
b. non-polar
F
P
F
22. (16 points) A Lewis structure for PF3 is shown.
F
Based on the Lewis structure shown and the VSEPR model, answer the following
questions.
A. (4 pts) What is the electronic geometry?
a. tetrahedral
pyramidal
b. square planar
c. trigonal planar
d. trigonal
c. trigonal planar
d. trigonal
B. (4 pts) What is the molecular geometry?
a. tetrahedral
pyramidal
b. square planar
C. (4 pts) What is the approximate F–P–F bond angle?
a. 90˚
b. 109.5˚
c. 120˚
d. 180˚
D. (4 pts) Given that the P–F bond is polar, which of the following describes the PF3
molecule?
a. polar
b. non-polar
23. (10 points) Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6Li (s) + N2 (g)  2Li3 N (s)
In a particular experiment, 3.50-g samples of each reagent are reacted. What is the theoretical
yield of lithium nitride in g?
5.85
24. (8 points) What is the empirical formula of a compound that contains 29% Na, 41% S, and
30% O by mass?
Na 2S2O3
25. (5 points) How many grams of H3 PO4 are in 175 mL of a 3.5 M solution of H3 PO4 ?
60
26. 3 bonus points
Pe rio d ic Ta b le of t he Ele m e nt s
1A
1
8A
18
3A
13
4A
14
5A
15
6A
16
7A
17
2
He
4 .0 0
5
B
1 0 .8
6
C
1 2 .0
7
N
1 4 .0
8
O
1 6 .0
9
F
1 9 .0
14
Si
2 8 .1
15
P
3 1 .0
16
S
3 2 .1
17
Cl
3 5 .5
30
Zn
6 5 .4
13
Al
2 7 .0
31
Ga
6 9 .7
10
Ne
2 0 .2
18
Ar
3 9 .9
32
Ge
7 2 .6
33
As
7 4 .9
34
Se
7 9 .0
35
Br
7 9 .9
36
Kr
8 3 .8
47
Ag
108
48
Cd
112
49
In
115
50
Sn
119
51
Sb
122
52
Te
128
53
I
127
54
Xe
131
79
Au
197
80
Hg
201
81
Tl
204
82
Pb
207
83
Bi
209
1
H
1 .0 1
2A
2
3
Li
6 .9 4
4
Be
9 .0 1
11
Na
2 3 .0
12
Mg
2 4 .3
3B
3
4B
4
5B
5
6B
6
7B
7
8
9
10
1B
11
2B
12
19
K
3 9 .1
20
Ca
4 0 .1
21
Sc
4 5 .0
22
Ti
4 7 .9
23
V
5 0 .9
24
Cr
5 2 .0
25
Mn
5 4 .9
26
Fe
5 5 .8
27
Co
5 8 .9
28
Ni
5 8 .7
29
Cu
6 3 .5
37
Rb
8 5 .5
38
Sr
8 7 .6
39
Y
8 8 .9
40
Zr
9 1 .2
41
Nb
9 2 .9
42
Mo
9 5 .9
43
Tc
(9 8 )
44
Ru
101
45
Rh
103
46
Pd
106
55
Cs
133
56
Ba
137
57
La
139
72
Hf
178
73
Ta
181
74
W
184
75
Re
186
76
Os
190
77
Ir
192
78
Pt
195
87
Fr
(2 2 3 )
88
Ra
226
89
Ac
227
8B
85
86
84
At
Rn
Po
(2 0 9 ) (2 1 0 ) ( 2 2 2 )
104
105
106
107
108
109
110
Rf
Db
Sg
Bh
Hs
Mt
Ds
(2 6 1 ) ( 2 6 2 ) (2 6 3 ) (2 6 2 ) ( 2 6 5 ) (2 6 6 ) (2 8 1 )
Lant ha nide s
58
Ce
140
59
Pr
141
Act inide s
90
Th
232
91
Pa
231
60
Nd
144
92
U
238
61
62
63
64
65
66
67
68
69
70
71
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
(1 4 5 ) 1 5 0
152
157
159
162
165
167
169 173
175
93
94
95
96
97
98
99
100
101
102
103
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
(2 3 7 ) (2 4 4 ) (2 4 3 ) ( 2 4 7 ) (2 4 7 ) (2 5 1 ) ( 2 5 2 ) (2 5 7 ) (2 5 8 ) (2 5 9 ) (2 6 0 )
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