1) Which one of the following substances is produced during the reaction of an acid
with a metal hydroxide?
A) H2
B) H2O
C) CO2
D) NaOH
E) O2
2) Acetic acid is a weak acid that dissociates into the acetate ion and a proton in
aqueous solution:
HC2H3O2 (aq) C2H3O2
– (aq) + H+ (aq)
At equilibrium at 25 oC a 0.100 M solution of acetic acid has the following
concentrations:
[HC2H3O2] = 0.0990 M, [C2H3O2
–] = 1.33 x 10-3M and [H+] = 1.33 x 10-3M. The
equilibrium constant, Keq, for the ionization of acetic acid at 25 oC is ________.
A) 5.71 x 104
B) 0.100
C) 1.75 x 10-7
D) 1.79 x 10-5
E) 5.71 x 106
3) Of the reactions below, which one is a decomposition reaction?
A) NH4Cl → NH3 + HCl
B) 2Mg + O2 → 2MgO
C) 2N2 + 3H2 → 2NH3
D) 2CH4 + 4O2 → 2CO2 + 4H2O
E) Cd(NO3)2 + Na2S → CdS + 2NaNO3
4) All of the ________ have a valence shell electron configuration ns1.
A) noble gases
B) halogens
C) chalcogens
D) alkali metals
E) alkaline earth metals
5) The reaction shown below is ________, and it is a ________ elementary reaction.
A + B + C –> ABC
A) termolecular, rare
B) termolecular, common
C) unimolecular, common
D) bimolecular, rare
E) unimolecular, rare
6) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of G o at 25 oC for the decomposition of gaseous sulfur dioxide to solid
elemental sulfur and gaseous oxygen,
SO2 (g) –> S (s, rhombic) + O2 (g)
is ________ kJ/mol.
A) +395.2
B) +269.9
C) -269.9
D) +300.4
E) -300.4
7) The n = 1 shell contains ________ p orbitals. All the other shells contain ________ p
orbitals.
A) 3, 6
B) 0, 3
C) 6, 2
D) 3, 3
E) 0, 6
8) A possible mechanism for the overall reaction
Br2 (g) + 2NO (g) –> 2NOBr (g)
is
NO (g) + Br2 (g) NOBr2 (g)(fast)
NOBr2 (g) + NO (g) 2NOBr(slow)
The rate law for formation of NOBr based on this mechanism is rate = ________.
A) k1[NO]1/2
B) k1[Br2]1/2
C) (k2k1/k-1)[NO]2[Br2]
D) (k1/k-1)2[NO]2
E) (k2k1/k-1)[NO][Br2]2
9) Nearly all commercial oxygen is obtained ________.
A) from air
B) by electrolysis of water
C) by thermal decomposition of potassium chlorate
D) by thermal cracking of petroleum
E) as a byproduct of the preparation of aluminum in the Hall process
10) Using the Born-Haber cycle, the H°f of KBr is equal to ________.
11) A slice of apple pie contains 14.0 grams of fat, 2.00 grams of protein, and 52.0
grams of carbohydrate. The respective fuel values for protein, fat, and carbohydrate are
17, 38, and 17 kJ/g, respectively. If cycling typically burns 1000.0 kJ/hour, ________
minutes of cycling are required to completely burn off the slice of pie.
A) 1.45
B) 4.66
C) 8.25
D) 87.0
E) < 1
12) What is meant by the salinity of seawater?
A) percent by mass of salt in seawater
B) mass in grams of dry salts present in 1 kg of seawater
C) molality of NaCl in seawater
D) osmotic pressure of seawater
E) molarity of NaCl in seawater
13) Which one of the following is a diprotic acid?
A) nitric acid
B) chloric acid
C) phosphoric acid
D) hydrofluoric acid
E) sulfuric acid
14) In nature, sulfur is most commonly found in ________.
A) pure elemental sulfur
B) sulfur oxides
C) metal sulfides
D) sulfuric acid
E) H2S
15) Consider the following two reactions:
A → 2B ΔH°rxn = 456.7 kJ/mol
A → C ΔH°rxn = -22.1 kJ/mol
Determine the enthalpy change for the process:
2B C
A) -478.8 kJ/mol
B) -434.6 kJ/mol
C) 434.6 kJ/mol
D) 478.8 kJ/mol
E) More information is needed to solve the problem.
16) In balancing the nuclear reaction Br –> E + e, the identity of element E is
________.
A) Kr
B) Br
C) U
D) Se
E) none of the above
17) Given the following reaction at equilibrium, if Kc = 1.90 x 1019at 25.0 oC, Kp =
________.
H2 (g) + Br2 (g) 2 HBr (g)
A) 5.26 x 10-20
B) 1.56 x 104
C) 6.44 x 105
D) 1.90 x 1019
E) none of the above
18) Calculate the maximum concentration (in M) of silver ions (Ag+) in a solution that
contains 0.025 M of CO3
2-. The Ksp of Ag2CO3 is 8.1 x 10-12.
A) 1.8 x 10-5
B) 1.4 x 10-6
C) 2.8 x 10-6
D) 3.2 x 10-10
E) 8.1 x 10-12
19) 210Pb has a half-life of 22.3 years and decays to produce 206Hg. If you start with
7.50 g of 210Pb, how many grams of 206Hg will you have after 17.5 years?
A) 4.35
B) 3.15
C) 3.09
D) 0.0600
E) 1.71