1) For molecules of the general formula ABn, n can be greater than four ________.
A) for any element A
B) only when A is an element from the third period or below the third period
C) only when A is boron or beryllium
D) only when A is carbon
E) only when A is Xe
2) A sample of potassium chlorate (15.0 g) is dissolved in 201 g of water at 70 oC, with
precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 oC
and no precipitate is observed. This solution is ________.
A) hydrated
B) miscible
C) saturated
D) unsaturated
E) supersaturated
3) Of the following, ________ has the odor of rotten eggs.
A) NH3
B) H2S
C) CO
D) NO2
E) HCN
4) What is the oxidation state of iron in K3[Fe(CN)6]?
A) 0
B) +2
C) +3
D) +4
E) +6
5) S is positive for the reaction ________.
A) Pb(NO3)2 (aq) + 2KI(aq) –> PbI2 (s) + 2KNO3 (aq)
B) 2H2O (g) –> 2H2 (g) + O2 (g)
C) H2O (g) –> H2O (s)
D) NO (g) + O2 (g) –> NO2 (g)
E) Ag+ (aq) + Cl– (aq) –> AgCl (s)
6) The attraction of a metal to a neutral ligand is due to ________ bonding.
A) ionic
B) covalent
C) ion-dipole
D) dipole-dipole
E) hydrophobic
7) When 0.500 mol of HC2H3O2 is combined with enough water to make a 300.0 mL
solution, the concentration of HC2H3O2 is ________ M.
A) 3.33
B) 1.67
C) 0.835
D) 0.00167
E) 0.150
8) Consider the reaction:
Ag+ (aq) + Cl– (aq) –> AgCl (s)
Given the following table of thermodynamic data at 298 K:
The value of K for the reaction at 25 oC is ________.
A) 810
B) 5.3 x 109
C) 1.8 x 104
D) 3.7 x 1010
E) 1.9 x 10-10
9) The equilibrium position corresponds to which letter on the graph of G vs. f (course
of reaction) below?
A) A
B) B
C) C
D) D
E) E
10) For the endothermic reaction
CaCO3 (s) CaO (s) + CO2 (g)
Le Ch¢telier’s principle predicts that ________ will result in an increase in the number
of moles of CO2.
A) increasing the temperature
B) decreasing the temperature
C) increasing the pressure
D) removing some of the CaCO3(s)
E) none of the above
11) Consider the following chemical reaction:
H2 (g) + I2 (g) 2HI (g)
At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were
0.20 M, 0.034 M, and 0.55 M, respectively. The value of Keq for this reaction is
________.
A) 23
B) 81
C) 0.0090
D) 5.1
E) 44
12) Cesium-131 has a half-life of 9.7 days. What percent of a cesium-131 sample
remains after 62 days?
A) 1.2 %
B) 100 %
C) 0 %
D) 99 %
E) 62%
13) Which one of the following is a Brnsted-Lowry base?
A) (CH3)3N
B) CH3COOH
C) HF
D) HNO2
E) none of the above
14) Which states of matter are significantly compressible?
A) gases only
B) liquids only
C) solids only
D) liquids and gases
E) solids and liquids
15) Gaseous mixtures ________.
A) can only contain molecules
B) are all heterogeneous
C) can only contain isolated atoms
D) are all homogeneous
E) must contain both isolated atoms and molecules
16) Cyclohexane has ________ fewer hydrogens than n-hexane.
A) 0
B) 1
C) 2
D) 3
E) 4