1) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of G o at 25 oC for the decomposition of calcium chloride into its
constituent elements,
CaCl2 (s) –> Ca (s) + Cl2 (g)
is ________ kJ/mol.
A) -795.8
B) +795.8
C) +763.7
D) +748.1
E) -748.1
2) Which of the following can form both high- and low-spin octahedral complexes?
A) Cr2+
B) Cr3+
C) Zn2+
D) Cu+
E) All of the above can form either high- or low-spin complexes.
3) Which of the following is a molecular hydride?
A) H2O
B) CsH
C) MgH2
D) TiH2
E) LiOH
4) A 25.0 mL sample of an HCl solution is titrated with a 0.139 M NaOH solution. The
equivalence point is reached with 15.4 mL of base. The concentration of HCl is
________ M.
A) 11.7
B) 0.00214
C) 0.0856
D) 0.267
E) 0.139
5) The F-B-F bond angle in the BF2
– ion is approximately ________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°
6) Potassium is a ________ and chlorine is a ________.
A) metal, nonmetal
B) metal, metal
C) metal, metalloid
D) metalloid, nonmetal
E) nonmetal, metal
7) With what compound will NH3 experience only ion-dipole intermolecular forces?
A) LiCl
B) SiH4
C) CH3I
D) C3H7OH
E) OCl2
8) Calculate the molality of a 35.0% (by mass) aqueous solution of nitric acid.
A) 6.64
B) 538
C) 2.19
D) 3.32
E) The density of the solution is needed to solve the problem.
9) Which set of three quantum numbers (n, l, ml) corresponds to a 4s orbital?
A) 4,0,1
B) 4,0,2
C) 4,0,0
D) 4,1,0
E) 4,1,1
10) The formation of krypton from rubidium decay is a result of ________.
A) alpha emission
B) beta emission
C) positron emission
D) electron capture
E) neutron capture
11) When the following equation is balanced, the coefficient of H2 is ________.
K (s) + H2O (l) → KOH (aq) + H2 (g)
A) 1
B) 2
C) 3
D) 4
E) 5
12) Elements in Group 8A are known as the ________.
A) halogens
B) alkali metals
C) alkaline earth metals
D) chalcogens
E) noble gases
13) Photoionization processes (e.g., N2 +h½ –> N2
+ + e–) remove UV of <150 nm.
Which photoreaction is the principal absorber of UV in the 150-200 nm range in the
upper atmosphere?
A) N2 + h½ –> 2N
B) O2 + h½ –> 2O
C) O3 + h½ –> O2 + O
D) N2 + O2 + h½ –> 2NO
E) NO + O2 + h½ –> NO3
14) ClF3 has “T-shaped” geometry. There is/are ________ non-bonding domain(s) in
this molecule.
A) 4
B) 2
C) 3
D) 1
E) 0
15) The combustion of ammonia in the presence of oxygen yields NO2 and H2O:
4 NH3 (g) + 7O2 (g) → 4 NO2 (g) + 6 H2O (g)
The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of
NO2.
A) 212
B) 178
C) 119
D) 0.954
E) 43.9