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1) The electron-domain geometry of the AsF6
- ion is octahedral. The hybrid orbitals
used by the As atom for bonding are ________ orbitals.
A) sp2d2
B) sp3
C) sp3d
D) sp3d2
E) sp2
2) What are the respective concentrations (M) of Cu+2 and Cl- afforded by dissolving
0.871 mol CuCl2 in water and diluting to 259 mL?
A) 3.36 and 6.73
B) 0.00336 and 3.36
C) 0.00336 and 0.00336
D) 3.36 and 3.36
E) 0.297 and 0.113
3) The simplest alkyne is ________.
A) ethylene
B) ethane
C) acetylene
D) propyne
E) benzene
4) The value of ΔH° for the reaction below is -186 kJ.
H2 (g) + Cl2 (g) → 2HCl (g)
The value of ΔH°f for HCl (g) is ________ kJ/mol.
A) -3.72 x 102
B) -1.27 x 102
C) -93.0
D) -186
E) +186
5) For a given substance that exhibits liquid-crystalline properties, the liquid-crystalline
state exists ________.
A) at one particular temperature below the melting point of the solid
B) in a range of temperatures below the melting point of the solid
C) at one particular temperature above the melting point of the solid
D) in a range of temperatures above the melting point of the solid
E) in a range of temperatures from below the melting point to above the melting point
6) What volume (mL) of a 5.45 M lead nitrate solution must be diluted to 820.7 mL to
make a 1.41 M solution of lead nitrate?
A) 212
B) 6310
C) 3170
D) 0.00936
E) 0.00471
7) Which one of the following could be a straight-chain alkene?
A) C4H8
B) C5H5
C) C7H9
D) C3H8
E) C10H22
8) The de Broglie wavelength of a 0.02900 gram bullet traveling at the speed of 647.4
m/s is ________ m.
A) 3.529 X 10-32
B) 3.529 X 10-33
C) 3.529 X 10-34
D) 3.529 X 10-35
E) 1.244 X 10-35
9) Potassium-40 decays to argon-40 with a half-life of 1.27 x 109 yr. The age of a
mineral sample that has a mass ratio of 40Ar to 40K of 0.330 is ________ yr.
A) 3.85 x 109
B) 1.77 x 109
C) 2.55 x 109
D) 3.62 x 108
E) 5.23 x 108
10) Of the following, ________ is the largest mass.
A) 284.7 Mg
B) 284.7 dg
C) 284.7 g
D) 284.7 Tg
E) 284.7 Gg
11) Pentane has ________ structural isomers.
A) 3
B) 2
C) 1
D) 4
E) 5
12) Which pair of elements is most apt to form an ionic compound with each other?
A) barium, bromine
B) calcium, sodium
C) oxygen, fluorine
D) sulfur, fluorine
E) nitrogen, hydrogen
13) In which of the following aqueous solutions does the weak acid e xhibit the lowest
percentage ionization?
A) 0.01 M HCN (Ka = 6.2 x 10-10)
B) 0.01 M H2CO3 (Ka = 4.5 x 10-7)
C) 0.01 M HNO2 (Ka = 4.0 x 10-4)
D) 0.01 M HCHO2 (Ka = 1.8 x 10-4)
E) 0.01 M HOCl (Ka = 3.5 x 10-8)
14) Calculate the pH of a solution prepared by dissolving 0.250 mol of benzoic acid
(C7H5O2H) and 0.150 mol of sodium benzoate (NaC7H5O2) in water sufficient to yield
1.00 L of solution. The Ka of benzoic acid is 6.50 x 10-5.
A) 4.409
B) 3.965
C) 10.035
D) 9.591
E) 5.190
15) When the following equation is balanced, the coefficients are ________.
NH3 (g) + O2 (g) → NO2 (g) + H2O (g)
A) 1, 1, 1, 1
B) 4, 7, 4, 6
C) 2, 3, 2, 3
D) 1, 3, 1, 2
E) 4, 3, 4, 3
16) Nonmetals can be ________ at room temperature.
A) solid, liquid, or gas
B) solid or liquid
C) solid only
D) liquid only
E) liquid or gas
