1) Which of the following molecules or ions will exhibit delocalized bonding?
A) SO2, SO3, and SO3
2-
B) SO3
2- only
C) SO2 and SO3
D) SO3 and SO3
2-
E) None of the above will exhibit delocalized bonding.
2) Iron has a density of 7.9 g/cm3. What is the mass of a cube of iron with the length of
one side equal to 55.0 mm?
A) 2.1 X 104 g
B) 4.3 X 102 g
C) 1.3 X 103 g
D) 1.4 g
E) 2.3 X 10-2 g
3) Of the following substances, ________ has the highest boiling point.
A) Br2
B) N2
C) Cl2
D) O2
E) H2
4) Which of the following statements about gases is false?
A) Gases are highly compressible.
B) Distances between molecules of gas are very large compared to bond distances
within molecules.
C) Non-reacting gas mixtures are homogeneous.
D) Gases expand spontaneously to fill the container they are placed in.
E) All gases are colorless and odorless at room temperature.
5) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The combustion of acetylene in the presence of excess oxygen yields carbon dioxide
and water:
2C2H2 (g) + 5O2 (g) –> 4CO2 (g) + 2H2O (l)
The value of S o for this reaction is ________ J/K mol.
A) +689.3
B) +122.3
C) +432.4
D) -122.3
E) -432.4
6) Which one of the following is true concerning borax?
A) It is the hydrated sodium salt of tetraboric acid.
B) It is found in dry lake deposits in California.
C) Its aqueous solutions are alkaline.
D) It is commonly used in cleaning products.
E) All of the above are true.
7) The compound whose formula is CaC2 is ________.
A) calcium carbide
B) carborundum
C) carbon calcide
D) calcium dicarbon
E) limestone
8) How many carbon atoms are there in 52.06 g of carbon dioxide?
A) 5.206 x 1024
B) 3.134 x 1025
C) 7.122 x 1023
D) 8.648 x 10-23
E) 1.424 x 1024
9) What is the electron configuration for the Co2+ ion?
A) [Ar]4s13d6
B) [Ar]3d7
C) [Ar]3d5
D) [Ar]4s23d9
E) [Ne]3s23p10
10) The heating curve shown was generated by measuring the heat flow and
temperature of a solid as it was heated. The heat flow into the sample in the segment
________ will yield the value of the Hfusion of this substance.
A) AB
B) BC
C) CD
D) DE
E) EF
11) Given the following reactions
N2 (g) + O2 (g) → 2NO (g) ΔH = +180.7 kJ
2NO (g) + O2 (g) → 2NO2 (g) ΔH = -113.1 kJ
the enthalpy of reaction for
4NO (g) → 2NO2 (g) + N2 (g)
is ________ kJ.
A) 67.6
B) 45.5
C) -293.8
D) -45.5
E) 293.8
12) Of the following elements, which have been shown to form compounds?
helium
neon
argon
krypton
xenon
A) xenon and argon
B) xenon only
C) xenon, krypton, and argon
D) xenon and krypton
E) None of the above can form compounds.
13) Consider the reaction:
Ag+ (aq) + Cl– (aq) –> AgCl (s)
Given the following table of thermodynamic data,
determine the temperature (in oC) above which the reaction is nonspontaneous under
standard conditions.
A) 1230
B) 150
C) 432
D) 133
E) 1640
14) An element that appears in the lower left corner of the periodic table is ________.
A) either a metal or metalloid
B) definitely a metal
C) either a metalloid or a nonmetal
D) definitely a nonmetal
E) definitely a metalloid
15) The central atom in ________ violates the octet rule.
A) PF5
B) SF2
C) Cl2
D) Br2CO
E) FCN
16) A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density
of the resulting solution is 1.05 g/mL. The concentration of CaCl2 in this solution is
________ molar.
A) 0.564
B) 0.571
C) 0.569
D) 0.537
E) 0.214
17) How many bonds can ethylenediamine form to a metal ion?
A) 1
B) 2
C) 3
D) 4
E) 6
18) Ammonium nitrite undergoes thermal decomposition to produce only gases:
NH4NO2 (s) → N2 (g) + 2H2O (g)
What volume (L) of gas is produced by the decomposition of 35.0 g of NH4NO2(s) at
525 °C and 1.5 atm?
A) 48
B) 160
C) 15
D) 72
E) 24
19) The list that correctly indicates the order of metallic character is ________.
A) B > N > C
B) F > Cl > S
C) Si > P > S
D) P > S > Se
E) Na > K > Rb
20) Which one of the following species has as many electrons as it has neutrons?
A) 1H
B) 40Ca2+
C) 14C
D) 19F–
E) 14C2+