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1) Which one of the following is most soluble in hexane (C6H14)?
A) CH3OH
B) CH3CH2CH2OH
C) CH3CH2OH
D) CH3CH2CH2CH2OH
E) CH3CH2CH2CH2CH2OH
2) The Lewis structure of the CO3
2- ion is ________.
A)
B)
C)
D)
E)
3) The value of ΔH° for the reaction below is -72 kJ. ________ kJ of heat are released
when 80.9 grams of HBr is formed in this reaction.
H2 (g) + Br2 (g) → 2HBr (g)
A) 144
B) 72
C) 0.44
D) 36
E) -72
4) Hydrogen can have oxidation states of ________.
A) +1 only
B) -1, 0, and +1
C) 0 and +1 only
D) -1 and +1 only
E) 0 only
5) Of the following oxides, ________ is the most acidic.
A) CaO
B) CO2
C) Al2O3
D) Li2O
E) Na2O
6) How many different principal quantum numbers can be found in the ground-state
electron configuration of nickel?
A) 2
B) 3
C) 4
D) 5
E) 6
7) The addition of hydrochloric acid and ________ to water produces a buffer solution.
A) HC6H5O
B) NaOH
C) NH3
D) HNO3
E) NaNO3
8) A buffer solution with a pH of 4.78 is prepared with ________ M formic acid and
0.90 M sodium formate. The Ka of formic acid is 1.8 x 10-4.
A) 0.083
B) 0.17
C) 3.3 x 103
D) 9.8
E) 0.041
9) The root-mean-square speed of N2 at 33.5 °C is ________ m/sec.
A) 522
B) 51.9
C) 173
D) 302
E) 16.5
10) If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy ________
L at STP.
A) 3.92
B) 50.8
C) 12.9
D) 25.5
E) 5.08
11) Which of the following expressions is the correct equilibrium-constant expression
for the equilibrium between dinitrogen tetroxide and nitrogen dioxide?
N2O4 (g) 2NO2 (g)
A)
B)
C)
D) [NO2][N2O4]
E) [NO2]2[N2O4]
12) A solution contains 51 ppm of benzene. The density of the solution is 1.00 g/mL.
This means that ________.
A) there are 51 mg of benzene in 1.0 L of this solution
B) 100 g of the solution contains 51 g of benzene
C) 100 g of the solution contains 51 mg of benzene
D) the solution is 51% by mass of benzene
E) the molarity of the solution is 51 M
13) Ni2+ ions are represented by the electron configuration ________.
A) [Ar]3d8
B) [Ar]3d10
C) [Ar]3d6
D) [Ar]4s23d6
E) [Kr]4d8
14) The least electronegative of the elements below is ________.
A) Se
B) S
C) F
D) Cl
E) Br
