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1) The molecular geometry of the H3O+ ion is ________.
A) linear
B) tetrahedral
C) bent
D) trigonal pyramidal
E) octahedral
2) Which one of the following atoms has the largest radius?
A) As
B) O
C) Sn
D) Cs
E) Ca
3) A typical triple bond ________.
A) consists of one bond and two € bonds
B) consists of three shared electrons
C) consists of two bonds and one € bond
D) consists of six shared electron pairs
E) is longer than a single bond
4) A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100 oC, with
precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 oC
and no precipitate is observed. This solution is ________.
A) hydrated
B) placated
C) saturated
D) unsaturated
E) supersaturated
5) The missing product from this reaction is ________.
Na --> _____ + e
A) Na
B) Mg
C) Mg
D) Ne
E) Ne
6) What is the wavelength (angstroms) of a photon that has an energy of 5.69 X 10-17 J?
A) 454 angstroms
B) 34.9 angstroms
C) 6.89 X 1015 angstroms
D) 3.66 X 109 angstroms
E) 3.50 X 10-9 angstroms
7) A compound is composed of only C, H, and O. The combustion of a 0.519-g sample
of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical
formula of the compound?
A) C6H6O
B) C3H3O
C) CH3O
D) C2H6O5
E) C2H6O2
8) The molecular geometry of the SiH2Cl2 molecule is ________.
A) trigonal planar
B) tetrahedral
C) trigonal pyramidal
D) octahedral
E) T-shaped
9) The hybridizations of iodine in IF3 and IF5 are ________ and ________,
respectively.
A) sp3, sp3d
B) sp3d, sp3d2
C) sp3d, sp3
D) sp3d2, sp3d
E) sp3d2, sp3d2
10) The general formula of a carboxylic acid is ________.
A)
B)
C)
D)
E)
11) The correct name for Ni(CN)2 is ________.
A) nickel (I) cyanide
B) nickel cyanate
C) nickel carbonate
D) nickel (II) cyanide
E) nickel (I) nitride
12) Which of the following acids will be the strongest?
A) H2SO4
B) HSO4
-
C) H2SO3
D) H2SeO4
E) HSO3
-
13) Of the bonds below, ________ is the least polar.
A) C-O
B) N-O
C) C-F
D) S-O
E) K-Br
14) The Ka of acetic acid (HC2H3O2) is 1.8 x 10-5. What is the pH at 25.0 oC of an
aqueous solution that is 0.100 M in acetic acid?
A) +2.87
B) -2.87
C) -11.13
D) +11.13
E) +6.61
15) The half-life of 222Rn is 3.80 days. If a sample contains 36.0 g of Rn-222, how
many years will it take for the sample to be reduced to 1.00 mg of Rn-222?
A) 19.7
B) 0.1597
C) 8.53
D) 0.0234
E) none of the above
16) Of the substances below, ________ will decrease the solubility of Pb(CN)2 in a
saturated solution.
A) Pb(MnO4)2
B) NaMnO4
C) HMnO4
D) H2O2
E) NaCl
17) The addition of hydrofluoric acid and ________ to water produces a buffer solution.
A) HCl
B) NaNO3
C) NaCl
D) NaOH
E) NaBr
