1) The density of a gold nugget is 19.3 g/cm3. If the volume of the gold nugget is
0.00369 L, the mass of the nugget is ________ g.
A) 71.2
B) 0.191
C) 19.3
D) 5.23
E) none of the above
2) What is the missing product from this reaction?
P –> S + _____
A) e
B) ³
C) e
D) He
E) P
3) The combination of two atomic orbitals results in the formation of ________
molecular orbitals.
A) 1
B) 2
C) 3
D) 4
E) 0
4) There are ________ unpaired electrons in a ground state chlorine atom.
A) 4
B) 3
C) 2
D) 1
E) 0
5) A 1.0 x 10-2 M aqueous solution of Ca(OH)2 at 25.0 oC has a pH of ________.
A) 12.30
B) 1.70
C) 2.0 x 10-2
D) 5.0 x 10-13
E) 12.00
6) Which hydroxides are weak bases?
A) KOH
B) Ba(OH)2
C) RbOH
D) CsOH
E) None of these choices are weak bases.
7) The temperature of 25 °C is ________ in Kelvins.
A) 103
B) 138
C) 166
D) 248
E) 298
8) The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to
contain 10.3 ppm strontium-90. How many years would pass before the strontium-90
concentration would drop to 1.0 ppm?
A) 92.3
B) 0.112
C) 186
D) 96.9
E) 131
9) The average rate of disappearance of A between 10 s and 20 s is ________ mol/s.
A) 2.2 x 10-3
B) 1.1 x 10-3
C) 4.4 x 10-3
D) 454
E) 9.90 x 10-3
10) Which of the following aqueous solutions has the lowest [OH–]?
A) a solution with a pH of 3.0
B) a 1 x 10-4 M solution of HNO3
C) a solution with a pOH of 12.0
D) pure water
E) a 1 x 10-3 M solution of NH4Cl
11) A solution is prepared by dissolving 2.00 g of glycerin (C3H8O3) in 201 g of ethanol
(C2H5OH). The freezing point of the solution is ________oC. The freezing point of
pure ethanol is -114.6 oC at 1 atm. The molal-freezing-point-depression constant (Kf)
for ethanol is 1.99 oC/m. The molar masses of glycerin and of ethanol are 92.1 g/mol
and 46.1 g/mol, respectively.
A) -116.6
B) 0.215
C) -112.6
D) -114.4
E) -114.8
12) The formal charge on nitrogen in NO3
– is ________, where the Lewis structure of
the ion is:
A) -1
B) 0
C) +1
D) +2
E) -2
13) Calculate the percentage by mass of lead in Pb(NO3)2.
A) 38.6
B) 44.5
C) 62.6
D) 65.3
E) 71.2
14) A saturated solution ________.
A) contains dissolved solute in equilibrium with undissolved solute
B) has the capacity to dissolve more solute
C) will rapidly precipitate if a seed crystal is added
D) contains no double bonds
E) cannot be attained
15) Which one of the following complexes can exhibit geometrical isomerism?
A) [Pt(NH3)2Cl2] (square planar)
B) [Zn(NH3)2Cl2] (tetrahedral)
C) [Cu(NH3)4]2+ (square planar)
D) [Cu(NH3)5Cl]2+ (octahedral)
E) All of the above can exhibit geometrical isomerism.