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The volume of a carbon atom is 1.9 10"30 m3. What is the radius of the atom in
picometers? The volume of a sphere is (4/3)pr3.
A.77 pm
B.520 pm
C.770 pm
D.3.0 102 pm
E.52 pm
For the combustion of acetylene at 298.15 K,
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(g)
calculate DS(universe) given DS(system) = "194.6 J/K and DH(system) = "2511.2 kJ.
A."2453.2 J/K
B."186.2 J/K
C.+186.2 J/K
D.+1290.4 J/K
E.+8228.0 J/K
The volume of an object is 8.12 10"3 m3. Calculate the volume in cubic feet. (2.54 cm =
1.00 inch, 12.0 inches = 1.00 foot)
A.2.87 10"7 ft3
B.0.287 ft3
C.0.0266 ft3
D.2.30 10"4 ft3
E.8.74 10"2 ft3
Sulfuric acid is the product of the reaction of ____ and H2O.
A.SO3
B.SO2
C.S8
D.H2S
E.SO4
2"
The elementary steps for the catalyzed decomposition of dinitrogen monoxide are
shown below.
N2O(g) + NO(g) N2(g) + NO2(g)
NO2(g) NO(g) + 1/2 O2(g)
Which of the following statements is/are CORRECT?
1/ The overall balanced reaction is N2O(g) N2(g) + 1/2 O2(g).
2/ NO2(g) is a catalyst for the reaction.
3/ NO(g) is a reaction intermediate.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
A solution is prepared by dissolving 5.88 g of an unknown nonelectrolyte in enough
water to make 0.355 L of solution. The osmotic pressure of the solution is 1.21 atm at
27 C. What is the molar mass of the solute? (R = 0.08206 Latm/molK)
A.0.00297 g/mol
B.30.3 g/mol
C.42.5 g/mol
D.175 g/mol
E.337 g/mol
A phase diagram of a pure compound has a triple point at 22.0 C and 32 mm Hg, a
normal melting point at 22.8 C, and a normal boiling point at 107 C. Which of the
following statements regarding this compound is/are CORRECT?
1/ The density of the liquid is greater than that of the solid.
2/ Sublimation occurs if starting with a solid at a constant temperature of 25 C the
pressure is decreased until a phase change occurs.
3/ Condensation occurs if the temperature is decreased from 122 C to 75 C at a constant
pressure of 1.00 atm.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
An aqueous solution with a pH of 2.00 is diluted from 1.0 L to 3.0 L. What is the pH of
the diluted solution?
A.0.67
B.2.00
C.2.48
D.4.33
E.6.00
Which of the following statements is/are CORRECT?
1/ Most ionic compounds containing phosphate ion are insoluble in water.
2/ Most ionic compounds containing potassium ion are insoluble in water.
3/ Most ionic compounds containing hydroxide ion are soluble in water.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
You have a 30.0 L cylinder of helium at a pressure of 132 atm and a temperature of 19
C. The He is used to fill balloons to a volume of 1.80 L at 745 mm Hg and 27 C. How
many balloons can be filled with He? Assume that the cylinder can provide He until its
internal pressure reaches 1.00 atm (i.e., there are 131 atmospheres of usable He in the
cylinder).
A.1.90 102
B.1.06 102
C.4.13 103
D.7.41 103
E.2.29 103
Which of the following statements are postulates of the kinetic-molecular theory of
gases?
1/ Gas particles are in constant, random motion.
2/ The distance between gas particles is large in comparison to their size.
3/ The average kinetic energy of gas particles is proportional to the kelvin temperature.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
The standard entropy for the formation of SF6(g) from the elements,
S(s) + 3 F2(g) SF6(g)
is "348.7 J/Kmol at 298.15 K. Calculate the standard molar entropy of SF6(g) given
S[S(s)] = 32.1 J/Kmol and S[F2(g)] = 202.8 J/Kmol.
A."988.6 J/Kmol
B.+291.8 J/Kmol
C."291.8 J/Kmol
D."113.2 J/Kmol
E.+113.8 J/Kmol
In the United States, most sulfur is obtained from
A.the reduction of cinnabar, HgS.
B.S8 deposits along the Gulf of Mexico.
C.the reduction of iron pyrite, FeS2.
D.the reduction of copper sulfide, CuS.
E.the oxidation of H2S gas.
The pH of an aqueous NaOH solution is 12.83. What is the hydrogen ion concentration
of this solution?
A.1.5 10"13 M
B.6.7 10"2 M
C.1.2 M
D.6.7 1012 M
E.2.7 10"6 M
The active ingredients in "strike anywhere" matches are ____ and the powerful
oxidizing agent KClO3(s).
A.N2H4
B.P4O10
C.Mg3N2
D.P4S3
E.(HPO3)3
Which of the following atoms contains the largest number of neutrons?
A.
B.
C.
D.
E.
For the first-order decomposition of N2O5 at a high temperature, determine the rate
constant if the N2O5 concentration decreases from 1.04 M to 0.62 M in 375 seconds.
A.5.99 10"4 s"1
B.1.59 10"3 s"1
C.1.74 10"3 s"1
D.1.38 10"3 s"1
E.1.94 102 s"1
Predict which of the following compounds has covalent bond(s) that are the most polar.
A.HF
B.I3
"
C.NO
D.Cl2O
E.HI
If DrG > 0 for a reaction at all temperatures, then DrH is ____ and DrS is ____.
A.negative, positive
B.positive, negative
C.negative, negative
D.positive, positive
E.positive, either positive or negative
Concentrated sodium hydroxide is 19.4 M and has a density of 1.54 g/mL. What is the
molality of concentrated NaOH?
A.12.6 m
B.19.8 m
C.25.4 m
D.29.9 m
E.50.4 m
Calculate Ecell for the following electrochemical cell at 25 C
Pt(s) | Fe3+(aq, 0.100 M), Fe2+(aq, 0.040 M) || Cl"(aq, 0.50 M) | AgCl(s) | Ag(s)
given the following standard reduction potentials.
AgCl(s) + e" Ag(s) + Cl"(aq) E = +0.222 V
Fe3+(aq) + e" Fe2+(aq) E = +0.771 V
A."1.034 V
B."0.590 V
C."0.508 V
D."0.555 V
E.+1.034 V
If 46.1 g Cu at 11.6 C is placed in 85.0 g H2O at 72.4 C, what is the final temperature of
the mixture? The specific heat capacities of copper and water are 0.385 J/gK and 4.184
J/gK, respectively.
A.71.2 C
B.63.6 C
C.51.0 C
D.42.0 C
E.69.5 C
Write a balanced net ionic equation for the reaction of aqueous solutions of baking soda
(NaHCO3) and acetic acid.
A.HCO3
"(aq) + CH3CO2H(aq) CH3CO2
"(aq) + H2O( ) + CO2(g)
B.2 NaHCO3(aq) + CH3CO2H(aq) 2 Na2CO3(aq) + CH4(aq) + 2H2O( ) + CO2(g)
C.NaHCO3(aq) + H+(aq) H2CO3(s) + Na+(aq)
D.HCO3
"(aq) + H+(aq) H2O( ) + CO2(g)
E.HCO3
"(aq) + H+(aq) H2CO3(aq)
At what temperature does 742 mm Hg of CH4 gas have the same density as 742 mm Hg
of O2 gas at 273 K?
A.137 K
B.146 K
C.191 K
D.275 K
E.545 K
All of the following elements or compounds react with water to produce hydrogen gas
EXCEPT ____.
A.Na(s)
B.MgH2(s)
C.Ca(s)
D.LiH(s)
E.CaO(s)
Which of the following are resonance structures for nitrite ion, NO2
"?
A.1 and 2
B.2 and 4
C.3 and 4
D.1, 2, and 3
E.2, 3, and 4
A 45.0 L gas cylinder contains 988 g He at 23 C. What is the pressure inside the
cylinder? (R = 0.08206 Latm/molK)
A.10.4 atm
B.41.4 atm
C.101 atm
D.133 atm
E.533 atm
What is the number of unpaired electrons in an octahedral, low-spin Mn(II) complex?
A.0
B.1
C.2
D.3
E.4
Which equation represents the number of atoms in a body-centered cubic unit cell?
A.
B.
C.
D.
E.
Hydrazine, N2H4, is produced by the Raschig process-the oxidation of ammonia with
alkaline ____.
A.HNO3(aq)
B.NaOCl(aq)
C.N2(g)
D.HPO4
2"(aq)
E.N2O(g)
At 25 C, the decomposition of dinitrogen tetraoxide
N2O4(g) 2 NO2(g)
has an equilibrium constant (Kp) of 0.144. At equilibrium, the total pressure of the
system is 0.0758 atm. What is the partial pressure of each gas?
A.0.0745 atm NO2(g) and 0.0385 N2O4(g)
B.0.0549 atm NO2(g) and 0.0209 N2O4(g)
C.0.0531 atm NO2(g) and 0.0227 N2O4(g)
D.0.0502 atm NO2(g) and 0.0256 N2O4(g)
E.0.0381 atm NO2(g) and 0.0377 N2O4(g)
