1) 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
________ molal.
A) 0.214
B) 0.569
C) 5.70
D) 63.2
E) 1.76
2) The sterilizing action of chlorine in water is due to what substance?
A) Cl–
B) Cl2
C) HCl
D) HClO
E) H+
3) A- is a weak base. Which equilibrium corresponds to the equilibrium constant Ka for
HA?
A) HA (aq) + H2O (l) H2A+ (aq) + OH– (aq)
B) A– (aq) + H3O+ (aq) HA (aq) + H2O (l)
C) HA (aq) + H2O (l) H3O+ (aq) + A– (aq)
D) A– (aq) + H2O (l) HA (aq) + OH– (aq)
E) A– (aq) + OH– (aq) HOA2-(aq)
4) The half-life of a first-order reaction is 13 min. If the initial concentration of reactant
is 0.13 M, it takes ________ min for it to decrease to 0.085 M.
A) 12
B) 10.
C) 8.0
D) 11
E) 7.0
5) What two oxidation states are more frequently observed in the first transition series
than in the third?
A) +3 and +7
B) +2 and +3
C) +2 and +7
D) +5 and +6
E) +3 and +5
6) Which of the following is an oxidation-reduction reaction?
A) Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu(NO3)2 (aq)
B) HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
C) AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)
D) Ba(C2H3O2)2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2(aq)
E) H2CO3 (aq) + Ca(NO3)2 (aq) → 2HNO3 (aq) + CaCO3 (s)
7) The formula for a salt is XBr. The X-ion in this salt has 46 electrons. The metal X is
________.
A) Ag
B) Pd
C) Cd
D) Cu
E) Cs
8) Of the choices below, which gives the order for first ionization energies?
A) Kr > Se > Br > Ga > Ge
B) Kr > Br > Se > Ge > Ga
C) Ga > Br > Ge > Kr > Se
D) Ga > Ge > Se > Br > Kr
E) Br > Se > Ga > Kr > Ge
9) Na reacts with element X to form an ionic compound with the formula Na3X. Ca will
react with X to form ________.
A) CaX2
B) CaX
C) Ca2X3
D) Ca3X2
E) Ca3X
10) The reaction A –> B is first order in [A]. Consider the following data.
The rate constant for this reaction is ________ s-1.
A) 0.014
B) 0.030
C) 0.013
D) 3.0
E) 3.1 x 10-3
11) The ratio of the actual value of a colligative property to the value calculated,
assuming the substance to be a nonelectrolyte, is referred to as ________.
A) Henry’s law
B) vapor pressure lowering
C) the van’t Hoff factor
D) freezing point depression
E) osmotic pressure
12) The heating curve shown was generated by measuring the heat flow and
temperature for a solid as it was heated. The slope of the ________ segment
corresponds to the heat capacity of the liquid of the substance.
A) AB
B) BC
C) CD
D) DE
E) EF
13) The element that corresponds to the electron configuration 1s22s22p2 is ________.
A) lithium
B) beryllium
C) boron
D) nitrogen
E) carbon
14) Hydrogen is unique among the elements because ________.
1. It has only one valence electron.
2. It is the only element that can emit an atomic spectrum.
3. Its electron is not at all shielded from its nucleus.
4. It is the lightest element.
5. It is the only element to exist at room temperature as a diatomic gas.
A) 1, 2, 3, 4, 5
B) 1, 3, 4
C) 1, 2, 3, 4
D) 2, 3, 4
E) 3, 4
15) What intermolecular force is responsible for the fact that ice is less dense than
liquid water?
A) London dispersion forces
B) dipole-dipole forces
C) ion-dipole forces
D) hydrogen bonding
E) ionic bonding