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1) Which of the following are decomposition reactions?
1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l)
2. CaO (s) + CO2 (g) → CaCO3 (s)
3. Mg (s) + O2 (g) → MgO (s)
4. PbCO3 (s) → PbO (s) + CO2 (g)
A) 1, 2, and 3
B) 4 only
C) 1, 2, 3, and 4
D) 2 and 3
E) 2, 3, and 4
2) Of the following, which is the strongest acid?
A) HClO
B) HClO3
C) HClO2
D) HClO4
E) HIO
3) Which substance in the reaction below either appears or disappears the fastest?
4NH3 + 7O2--> 4NO2 + 6H2O
A) NH3
B) O2
C) NO2
D) H2O
E) The rates of appearance/disappearance are the same for all of these.
4) What is the frequency of light (s-1) that has a wavelength of 1.23 X 10-6 cm?
A) 3.69
B) 2.44 X 1016 s-1
C) 4.10 X 10-17 s-1
D) 9.62 X 1012 s-1
E) 1.04 X 10-13 s-1
5) Which species is an isotope of 39Cl?
A) 40Ar+
B) 34S2-
C) 36Cl-
D) 80Br
E) 39Ar
6) The primary commercial use of nitric acid is ________.
A) in the manufacture of plastics
B) in the manufacture of explosives
C) in pool water maintenance
D) in the manufacture of fertilizers
E) in the manufacture of anti-depressant drugs
7) What is the frequency (s-1) of electromagnetic radiation that has a wavelength of 2.3
m?
A) 1.3 X 108 s-1
B) 1.8 X 10-9 s-1
C) 1.6 X 108 s-1
D) 1.3 X 10-33 s-1
E) 1.3 X 1033 s-1
8) The element X has three naturally occurring isotopes. The masses (amu) and %
abundances of the isotopes are given in the table below. The average atomic mass of the
element is ________ amu.
A) 219.7
B) 220.4
C) 220.42
D) 218.5
E) 221.0
9) The concentration of species in 500 mL of a 2.104 M solution of sodium sulfate is
________ M sodium ion and ________ M sulfate ion.
A) 2.104, 1.052
B) 2.104, 2.104
C) 2.104, 4.208
D) 1.052, 1.052
E) 4.208, 2.104
10) The suffix -ide is used primarily ________.
A) for monatomic anion names
B) for polyatomic cation names
C) for the name of the first element in a molecular compound
D) to indicate binary acids
E) for monoatomic cations
11) Which of the following is not a stage in water treatment?
A) coarse filtration
B) aeration
C) chlorination
D) distillation
E) settling
12) At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile
(CH3CN):
CH3NC (g) --> CH3CN (g)
The reaction is first order in methylisonitrile. The attached graph shows data for the
reaction obtained at 198.9 oC.
The rate constant for the reaction is ________ s-1.
A) -1.9 x 104
B) +1.9 x 104
C) -5.2 x 10-5
D) +5.2 x 10-5
E) +6.2
13) The oxidation state of oxygen in OF2 is ________.
A) +1
B) +2
C) 0
D) -1
E) -2
14) How many neutrons are there in one atom of 184W?
A) 74
B) 112
C) 258
D) 110
E) 184
15) There are ________ electrons, ________ protons, and ________ neutrons in an
atom of Xe.
A) 132, 132, 54
B) 54, 54, 132
C) 78, 78, 54
D) 54, 54, 78
E) 78, 78, 132
16) Calculate the pH of a solution prepared by dissolving 0.150 mol of acetic acid and
0.300 mol of sodium acetate in water sufficient to yield 1.00 L of solution. The Ka of
acetic acid is 1.76 x 10-5.
A) 2.516
B) 3.892
C) 4.502
D) 10.158
E) 5.056
17) An object will sink in a liquid if the density of the object is greater than that of the
liquid. The mass of a sphere is 9.83 g. If the volume of this sphere is less than
________ cm3, then the sphere will sink in liquid mercury (density = 13.6 g/cm3).
A) 0.723
B) 1.38
C) 134
D) 7.48
E) none of the above
18) What is the oxidation state of iron in CaNa[Fe(CN)6]?
A) 0
B) +2
C) +3
D) +4
E) +6
