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1) In the resonance form of ozone shown below, the formal charge on the central
oxygen atom is ________.
A) 0
B) +1
C) -1
D) +2
E) -2
2) Of the following molecules, only ________ is polar.
A) CCl4
B) BCl3
C) NCl3
D) BeCl2
E) Cl2
3) An FM radio station broadcasts electromagnetic radiation at a frequency of 89.7
MHz. The wavelength of this radiation is ________ m.
A) 3.34 X 106
B) 3.34
C) 2.69 X 1016
D) 2.69 X 1010
E) 0.299
4) The molecular weight of a gas is ________ g/mol if 3.5 g of the gas occupies 2.1 L at
STP.
A) 41
B) 5.5 x 103
C) 37
D) 4.6 x 102
E) 2.7 x 10-2
5) The first person to investigate the relationship between the pressure of a gas and its
volume was ________.
A) Amadeo Avogadro
B) Lord Kelvin
C) Jacques Charles
D) Robert Boyle
E) Joseph Louis Gay-Lussac
6) The beta decay of cesium-137 has a half-life of 30.0 years. How many years must
pass to reduce a 30 mg sample of cesium 137 to 5.2 mg?
A) 76 years
B) -76 years
C) 38 years
D) 0.040 years
E) 25 years
7) The oxidation number of phosphorus in PF5 is ________.
A) +5
B) +3
C) +1
D) -5
E) 0
8) The majority of ozone that protects against the high energy radiation of the sun is
found in the ________.
A) thermosphere
B) mesosphere
C) mesopause
D) stratosphere
E) troposphere
9) The average rate of disappearance of I- between 1200.0 s and 1600.0 s is ________
M/s.
A) 1.8 x 10-5
B) 1.2 x 10-5
C) 2.0 x 10-5
D) 5.0 x 104
E) 1.6 x 10-4
10) A weak electrolyte exists predominantly as ________ in solution.
A) atoms
B) ions
C) molecules
D) electrons
E) an isotope
11) What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three
significant figures?
A) 25.4
B) 28.6
C) 30.7
D) 7.74
E) 78.1
12) The blending of one s atomic orbital and one p atomic orbital produces ________.
A) two sp hybrid orbitals
B) two sp2 hybrid orbitals
C) two sp3 hybrid orbitals
D) three sp hybrid orbitals
E) three sp2 hybrid orbitals
13) How many grams of sodium chloride are there in 55.0 mL of a 1.90 M aqueous
solution of sodium chloride?
A) 0.105
B) 6.11
C) 3.21
D) 6.11 x 103
E) 12.2
