Download Name: General Chemistry First Midterm 2014

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General Chemistry First Midterm 2014 First Semester
Questions from Chapter-2: Atoms and Atomic Theory
1) What is the correct symbol for the species that contains 12 neutrons, 11
protons, and 22 electrons?
2) Indicate the number of protons, neutrons, and electrons in
(a) an atom of barium-135 and
(b) the double negatively charged ion of selenium-80.
3) Which
mass?
a.
b.
c.
d.
e.
of the following have the same charge and approximately the same
an electron and a proton;
a proton and a neutron;
a hydrogen atom and a proton;
a neutron and a hydrogen atom;
an electron and ion.
4) We found that when 0.455 g of magnesium reacted with 2.315 g of oxygen,
0.755 g of magnesium oxide was obtained. Determine the mass of magnesium
contained in a 0.500 g sample of magnesium oxide?
5) Two naturally occurring isotopes of lithium, lithium-6 and lithium-7, have
masses of 6.01512 u and 7.01600 u, respectively. Which of these two occurs
in greater abundance?
Questions from Chapter-3: Compounds
6) Write the names of the following chemicals:
a. NaCl :
b. BCl3
:
c. MgI2
:
d. Al2O3 :
e. N2O5
:
7) Write the formulas for the following chemicals:
a. Iron (II) Sulfide
:
b. Hydrochloric acid
:
c. Calcium Fluoride
:
d. Copper (II) Chloride :
e. Dinitrogen pentoxide :
8) Determine the mass in grams of!
a. 6.25 * 10-2 mol P4!
b. 4.03 * 1024 molecules of stearic acid, C18H36O2
c. A quantity of the amino acid lysine, C6H14N2O2, containing 3.03 mol N
atoms
Questions from Chapter-4: Chemical Reactions
9) Phosphorus trichloride, PCl3, is commercially important compound in the
manufacture of pesticides, gasoline additives and a number of other products.
Liquid PCl3 is made by the direct combination of phosphorous and chlorine.
P4 (s) + 6 Cl2 (g) -> 4 PCl3 (l)
What is the maximum mass of PCl3 that can be obtained from 125 g P4 and
323 g Cl2?
10) Titaniumtetrachloride,TiCl4, is prepared by the reaction below.
TiO2 (s) + C(s) + Cl2 (g) ! TiCl4(g) + CO2 (g) + CO (g)
First balance the equation. And find the maximum mass of TiCl4 that can be
obtained from 35 g TiO2, 45 g Cl2 and 11 g C?
11) Billions of kilograms of urea, CO(NH2)2 , are produced annually for use as a
fertilizer.
2NH3 (g) + CO2 (g) -> CO(NH2)2 (s) + H2O (l)
If 47.7 g urea forms per mole of CO2 that reacts, what is the a) Theoretical
yield, b) Actual Yield, c) Percent Yield?
Questions from Chapter-5: Reactions in Water
Solubility Rules:
Salts of group 1 cations (with some exceptions of Li) and are
NH4 !soluble.
II.
Nitrates, acetates, and perchlorates are soluble.
III.
Salts of silver, lead, and mercury(I) are insoluble.
IV. Chlorides, bromides, and iodides are soluble.
V. Carbonates,phosphates,sulfides,oxides,and hydroxides are
insoluble !(sulfides of group 2 cations and hyadarrenodxides of
Ca2+, Sr2+, Ba2+ !slightly soluble).
VI. Sulfates are soluble except for those of calcium, strontium, and
barium.
12) Indicate whether a precipitate forms by the following equations. If no reaction
occurs, so state. (Indicate the precipitation rules)
I.
(a) NH4Cl (aq) + KNO3 (aq) ->
(b) PbCl2 (aq) + KI (aq) !
(c) Na2SO4(aq) + Pb(NO3)2 (aq) ->
1
3
1
IA
1A
H
Hydrogen
1.008
Li
Lithium
6.941
Na
11
Sodium
22.990
19
K
Potassium
39.098
Rb
Rubidium
84.468
37
55
Cs
Cesium
132.905
87
Fr
Francium
223.020
4
2
IIA
2A
Be
Beryllium
9.012
Mg
12
Magnesium
24.305
20
Calcium
40.078
Ca
Sr
Strontium
87.62
38
56
Ba
Barium
137.327
88
Ra
Radium
226.025
21
3
IIIB
3B
Sc
Scandium
44.956
Y
Yttrium
88.906
39
57-71
22
4
IVB
4B
Ti
Titanium
47.88
Zr
Zirconium
91.224
40
72
Hf
Hafnium
178.49
104
Rf
58
23
5
VB
5B
V
Vanadium
50.942
Nb
Niobium
92.906
41
73
Ta
Tantalum
180.948
105
24
6
VIB
6B
Cr
Chromium
51.996
7
VIIB
7B
8
Iron
55.933
Fe
26
9
VIII
8
Rh
77
Iridium
192.22
109
Mt
63
28
10
Ni
Nickel
58.693
Pd
Palladium
106.42
46
78
Pt
Platinum
195.08
110
Ds
64
29
11
IB
1B
Copper
63.546
Cu
Ag
Silver
107.868
47
79
Au
Gold
196.967
111
Rg
Gd
Gadolinium
157.25
Curium
247.070
96
Am Cm
Americium
243.061
95
Europium
151.966
Eu
65
30
12
IIB
2B
Zinc
65.39
Zn
Cd
Cadmium
112.411
48
80
Mercury
200.59
Hg
112
Cn
Bk
Berkelium
247.070
97
Terbium
158.925
Tb
66
5
13
IIIA
3A
B
Al
Boron
10.811
13
Aluminum
26.982
31
Gallium
69.732
Ga
In
Indium
114.818
49
81
Tl
Thallium
204.383
113
6
14
IVA
4A
C
Si
Carbon
12.011
14
Silicon
28.086
32
Ge
Germanium
72.61
Tin
118.71
Sn
50
82
Lead
207.2
Pb
114
Fl
Flerovium
[289]
Uut
Ununtrium
unknown
7
15
VA
5A
N
P
Nitrogen
14.007
15
Phosphorus
30.974
33
Arsenic
74.922
As
Sb
Antimony
121.760
51
83
Bi
8
16
VIA
6A
O
S
Oxygen
15.999
16
Sulfur
32.066
34
Se
Selenium
78.09
Te
Tellurium
127.6
52
84
Po
Polonium
[208.982]
116
9
17
VIIA
7A
F
Cl
Fluorine
18.998
17
Chlorine
35.453
35
Br
Bromine
79.904
I
Iodine
126.904
53
85
At
Astatine
209.987
117
2
18
VIIIA
8A
Helium
4.003
He
10
Neon
20.180
Ne
Ar
18
Argon
39.948
Kr
36
Krypton
84.80
Xenon
131.29
Xe
54
Rn
86
Radon
222.018
118
Bismuth
208.980
115
Ununoctium
unknown
Lawrencium
[262]
Lr
103
Lutetium
174.967
Lu
71
Uus Uuo
Yb
No
Nobelium
259.101
102
Ytterbium
173.04
70
Uup Lv
69
Md
Mendelevium
258.1
101
Thulium
168.934
Tm
Ununpentium Livermorium Ununseptium
unknown
[298]
unknown
Fermium
257.095
Fm
100
Erbium
167.26
Er
68
Es
Einsteinium
[254]
99
Holmium
164.930
Ho
67
Cf
Californium
251.080
98
Dysprosium
162.50
Dy
Meitnerium Darmstadtium Roentgenium Copernicium
[268]
[269]
[272]
[277]
Samarium
150.36
Pu
Plutonium
244.064
94
Ir
Rhodium
102.906
45
Cobalt
58.933
Co
27
Periodic Table of the Elements
25
Mn
Manganese
54.938
Ru
Ruthenium
101.07
44
Tc
Technetium
98.907
43
Mo
76
108
Osmium
190.23
Os
Molybdenum
95.94
75
107
Rhenium
186.207
Re
42
74
W
Tungsten
183.85
106
Hs
Hassium
[269]
Bh
Bohrium
[264]
Sg
Seaborgium
[266]
62
Db
61
60
Np
Neptunium
237.048
93
Pm Sm
59
U
Uranium
238.029
92
Nd
Promethium
144.913
Pr
Praseodymium Neodymium
140.908
144.24
Pa
Protactinium
231.036
91
Dubnium
[262]
Th
Thorium
232.038
90
Cerium
140.115
Ce
Rutherfordium
[261]
Ac
Actinium
227.028
89
Lanthanum
138.906
La
57
89-103
Lanthanide
Series
Actinide
Series
© 2013 Todd Helmenstine
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