Name:____________________________________
CHEM1110.20787
Test3,FormA
Spring2013
Part1–BalancingequationsandStoichiometryCalculations(50pts),showALLworkforcredit.
1. (6pts)Balancethefollowingequationsandidentifythereactiontype.
ReactionType:_________________________________
a. _____Al+______Cl2________AlCl3
ReactionType:_________________________________
b. _____NH4NO3_____N2O+_____H2O 2. (4pts)Balancethefollowingequations.
a. _____Mg(NO3)2+_____NaOH_____Mg(OH)2+_____NaNO3
b. _____CaCl2+_____K3PO4_____Ca3(PO4)2+_____KCl
3. (10pts)Writethebalancedequationforthecombustionofethane,C2H6.
4. (10pts)Allicinisthecompoundresponsibleforthecharacteristicsmellofgarlic.Themolecularformulaof
allicinisC6H10OS2.Whatisthemassofcarbonin3.45gofC6H10OS2?(MMofC6H10OS2=162.27g/mol)
5. (10pts)Automotiveairbagsinflatewhensodiumazide,NaN3,rapidlydecomposestoitscomponent
elements.Whatmassofsodiumisformedwhen15.0gofNaN3decompose?(MMofNaN3=65.01g/mol)
2NaN32Na+3N2
6. (10pts)Thefermentationofglucose(C6H12O6)producesethanol(C2H5OH)andcarbondioxide.The
balancedreactionisbelow.WhatmassofCO2isproducedwhen7.50gC6H12O6arefermented?(MMof
C6H12O6=180.18g/mol,MMofCO2=44.01g/mol)
C6H12O62C2H5OH+2CO2
Part2–LewisDotStructures,MolecularGeometry,VSEPRTheory,HybridizationandPolarity(40pts)For
eachofthefollowingmoleculesorions:drawthecorrectLewisDotStructure,determinethemoleculargeometry,
givethehybridizationofthecentralatomanddetermineifthemoleculeispolarornonpolar.Includeallpossible
resonancestructures.
SO3
MolecularGeometry: ____________________
Hybridization:____________________
Polarity:
____________________
OF2
MolecularGeometry: ____________________
Hybridization:____________________
Polarity:
____________________
SF42‐
MolecularGeometry: ____________________
Hybridization:____________________
Polarity:
____________________
IF5
MolecularGeometry: ____________________
Hybridization:____________________
Polarity:
____________________
Part3–BondingandElectronegativity(10pts)
1. (5pts)Howmanysigmaandpibondsarethereinthefollowingmolecule?
H
H
C
C
H
C
H
C
C
H
C
C
C
C
H
C
H
H
H
H
2. (5pts)Rankthefollowingatomsinorderofelectronegativity:P,F,Cl,andGe
/100 1
2
1
3
1
IA
H
1.008
Li
6.94
4
2
IIA
Be
9.01
3
4
5
6
8
9
10
11
IB
IIB
12
Periodic Table of the Elements
7
VIIIB
DO NOT WRITE ON PERIODIC TABLE
VIIB
5
13
IIIA
B
10.81
6
14
IVA
C
12.01
7
15
VA
N
14.01
8
16
VIA
O
16.00
9
18
VIIIA
He
4.00
17
VIIA
10
Ne
20.18
2
F
19.00
13
14
15
16
17
18
Al
Si
P
S
Cl
Ar
26.98 28.09 30.97 32.06 35.45 39.95
11
12
Na
Mg
22.99 24.31
VIB
3
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
39.10 40.08 44.96 47.90 50.94 52.00 54.94 55.85 58.93 58.693 63.546 65.37 69.72 72.59 74.92 78.96 79.90 83.80
VB
4
37
38
39
40
41
42
43
Rb
Sr
Y
Zr
Z
Nb
Mo
Tc
T
85.47 87.62 88.91 91.22 92.91 95.94
[98]
IVB
5
55
56
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
Cs
Ba
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
132.91 137.34 174.97 178.49 180.95 183.85 186.21 190.2 192.22 195.09 196.97 200.59 204.37 207.19 208.98 [209]
[210]
[222]
IIIB
6
87
88
103
104
105
106
107
108
109
110
111
112
113
114
115
116
Fr
Ra
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Uub
Uut
Uuq
Uup
Uuh
[223]
[226]
[262]
[261]
[262]
[263]
[262]
[265]
[276]
[281]
[280]
[285]
[284]
[289]
[288]
[293]
118
Uuo
[294]
44
45
46
47
48
49
50
51
52
53
54
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
T
I
Xe
101.07 102.91 106.4 107.87 112.40 114.82 118.69 121.75 127.60 126.90 131.30
7
57
58
59
60
61
62
63
64
65
66
67
68
69
70
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
138.91 140.12 140.91 144.24 [145] 150.35 151.96 157.25 158.92 162.5 164.93 167.26 168.93 173.04
89
90
91
92
93
94
95
96
97
98
99
100
101
102
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
[227] 232.04 [231] 238.03 [237]
[244]
[243]
[247]
[247]
[251]
[252]
[257]
[258]
[259]
REPRESENTATIVE VSEPR STRUCTURES
Bonded Atoms
Lone Pair Electrons
Molecular Geometry
Hybridization
6
0
Octahedral
5
1
Square pyramidal
sp3d2
sp d
sp d
Bonded Atoms
Lone Pair Electrons
Molecular Geometry
Hybridization
5
0
Trigonal bipyramidal
sp3d
4
1
See-saw
3
2
T-Shaped
2
3
Linear
sp3d
sp3d
sp3d
Bonded Atoms
Lone Pair Electrons
Molecular Geometry
Hybridization
4
0
Tetrahedral
sp3
3
1
Trigonal pyramidal
2
2
Bent
sp3
sp3
Bonded Atoms
Lone Pair Electrons
Molecular Geometry
Hybridization
3
0
Trigonal planar
sp2
2
1
Bent
Bonded Atoms
Lone Pair Electrons
Molecular Geometry
Hybridization
2
0
Linear
sp
3 2
sp
2
4
2
Square planar
3 2