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What is the equilibrium partial pressure of water vapor above a mixture of 37.5 g H2O
and 62.5 g HOCH2CH2OH at 55 C. The partial pressure of pure water at 55.0 C is
118.0 mm Hg. Assume ideal behavior for the solution.
A.3.54 mm Hg
B.31.7 mm Hg
C.38.5 mm Hg
D.79.5 mm Hg
E.175 mm Hg
What is the hybridization of each carbon atom in benzene, C6H6? Benzene contains a
six-member carbon ring.
A.sp
B.sp2
C.sp3
D.sp3d
E.sp3d2
Calculate DrH for the combustion of ammonia,
4 NH3(g) + 7 O2(g) 4 NO2(g) + 6 H2O( )
using standard molar enthalpies of formation.
molecule DfH (kJ/mol-rxn)
NH3(g) "45.9
NO2(g) +33.1
H2O( ) "285.8
A.+30.24 kJ/mol-rxn
B."206.9 kJ/mol-rxn
C."298.6 kJ/mol-rxn
D."1398.8 kJ/mol-rxn
E."1663.6 kJ/mol-rxn
If the de Broglie wavelength of an electron is 44 nm, what is its velocity? The mass of
an electron is 9.11 10"31 kg.
A.6.0 10"5 m/s
B.1.2 103 m/s
C.1.7 104 m/s
D.3.1 1010 m/s
E.4.8 1022 m/s
One means of enriching the percentage of uranium-235 for use as nuclear fuel is ____.
A.liquid distillation
B.gaseous centrifugation
C.mass spectroscopy
D.gamma ray bombardment
E.ion chromatography
An aqueous nitric acid solution has a pH of 2.15. What mass of HNO3 is present in 20.0
L of this solution?
A.0.11 g
B.0.022 g
C.3.7 g
D.6.8 g
E.8.9 g
Which of the following compounds is expected to have the strongest ionic bonds?
A.MgO
B.KBr
C.NaI
D.BaO
E.SrS
By what (single step) process does americium-241 decay to neptunium-237?
A.a particle emission
B.b particle emission
C.positron emission
D.electron capture
E.neutron capture
What is the de Broglie wavelength of a 57 g tennis ball traveling at 202 km/hr?
A.2.1 10"34 m
B.2.1 10"37 m
C.5.8 10"35 m
D.9.4 104 m
E.4.8 1036 m
Which of the following statements is/are CORRECT?
1/ Of the four unit cell structures in which metals crystallize, three are based on the
cubic unit cell and the fourth is the hexagonal unit cell.
2/ Transition metals with high densities, especially those in period 6, preferentially
crystallize with a primitive cubic cell structure.
3/ The preferred crystal structure of the Group 1A metals is face-centered cubic.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
What is the distance, in atomic radii, along any edge of a face-centered unit cell?
A.
B.2 r
C.4 r
D.
E.r
What is the oxidation state of molybdenum in [Mo(H2O)5OH]Cl2?
A.+1
B.+2
C.+3
D.+4
E.+6
Group 1A elements are also known as
A.alkaline earth metals.
B.alkali metals.
C.chalcogens.
D.halogens.
E.noble gases.
According to experiments concerned with the photoelectric effect, which of the
following will increase the kinetic energy of an electron ejected from a metal surface?
1/ increasing the wavelength of the light striking the surface
2/ increasing the frequency of the light striking the surface
3/ increasing the number of photons of light striking the surface
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
In boron neutron capture therapy (BNCT), boron-10 is injected into a tumor. When the
tumor is irradiated with neutrons, boron nuclei capture the neutrons and disintegrate
into two particles. These particles are lithium-7 and a(n) ____.
A.alpha particle
B.beta particle
C.positron
D.deuterium nuclei
E.helium nuclei
The reaction of tetraphosphorus decaoxide with water produces phosphoric acid.
__ P4O10 + __ H2O __ H3PO4
What are the respective coefficients when the equation is balanced with the smallest
integer values?
A.1, 1, 1
B.1, 3, 1
C.2, 4, 1
D.2, 6, 2
E.1, 6, 4
Which of the following is the most penetrating form of radiation?
A.a
B.b
C.
D.g
E.All of the above are equally penetrating.
What is the molecular formula of chlorous acid?
A.HClO
B.HClO2
C.HClO3
D.HClO4
E.HCl
If the volume of a confined gas is expanded to four times the original volume while its
temperature remains constant, what change will be observed?
A.The pressure of the gas will decrease to 1/4 its original value.
B.The pressure of the gas will decrease to 1/2 its original value.
C.The pressure of the gas will remain unchanged.
D.The pressure of the gas will increase to twice its original value.
E.The pressure of the gas will increase to four times its original value.
Use Lewis structures to predict the bond order for a sulfur-oxygen bond in sulfur
trioxide.
A.1/2
B.1
C.4/3
D.3/2
E.2
What charge, in coulombs, is required to deposit 1.5 g Mg(s) from a solution of Mg2+
(aq)?
A.4.1 102 C
B.6.0 103 C
C.1.2 104 C
D.2.9 105 C
E.3.1 106 C
The Henry's law constant for N2 in water at 25 C is 6.0 10"4 mol/kgbar. What is the
equilibrium concentration of N2 in water when the partial pressure of N2 is 586 mm
Hg? (760 mm Hg = 1 atm = 0.9869 bar)
A.1.4 10"9 M
B.1.8 10"5 M
C.4.6 10"4 M
D.7.7 10"4 M
E.7.9 10"4 M
Which ion produces the red color in rubies?
A.Mn2+
B.Zr4+
C.Pd2+
D.Cr3+
E.Ti4+
Calculate the number of moles in 0.48 g Cu.
A.0.033 mol
B.0.48 mol
C.31 mol
D.7.6 10-3 mol
E.1.3 102 mol
An acid-base equilibrium system is created by dissolving 0.50 mol CH3CO2H in water
to a volume of 1.0 L. What is the effect of adding 0.50 mol CH3CO2
"(aq) to this
solution?
1/ The pH of the solution will equal 7.00 because equal concentrations of a weak acid
and its conjugate base are present.
2/ Some CH3CO2H(aq) will ionize, increasing the concentration of CH3CO2
"(aq) and
increasing the pH.
3/ Some CH3CO2
"(aq) will react with H3O+, increasing the concentration of
CH3CO2H(aq) and reestablishing the solution equilibrium.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
Which of the following elements is able to form a molecular structure that exceeds the
octet rule?
A.C
B.B
C.N
D.F
E.S
The half-life of carbon-14 is 5730 years. If a sample initially contains 2.67 mg
carbon-14, what mass remains in the sample after 2.40 104 years?
A.0.0 mg
B.0.17 mg
C.0.92 mg
D.0.15 mg
E.0.64 mg
Determine the number of unpaired electrons in the tetrahedral complex ion
[Co(NH3)4]2+.
A.0
B.1
C.2
D.3
E.4
The ideal gas law can be modified to correct for the errors arising from nonideality. The
modified equation is known as the ________ equation of state for a real gas.
The percent yield of a chemical reaction is calculated by dividing the actual yield by the
________ yield and multiplying by 100%.
Assuming the density of water is 1.00 g/cm3, the mass of 1.0 cubic meter (m3) of water
is ________ grams.
Draw a Lewis structure of xenon trioxide. What is the hybridization of the xenon atom
in this molecule?
To make a buffer with a pH of 8.00, you should use a weak acid with a Ka close to
_______.
In any chemical process, energy must be conserved. This is a statement of the ________
law of thermodynamics.
Explain why the first ionization energy for oxygen is lower than that for nitrogen.
A(n) ________ reaction is one where an element or compound is simultaneously
oxidized and reduced.
If electric current is passed through a solution of molten KBr, the product at the cathode
is ________.
A peptide bond is the amide linkage that is formed in a condensation reaction involving
the __________ group of one amino acid with the carboxylic acid group of a second
amino acid.
The following equation: A = e C (where is path length and C is concentration) is
known as the _____-Lambert law.
Carbon dating may be used to date (once living) materials that are between 100 and
40,000 years old. The half-life of the first-order decay of carbon-14 is 5730 years. What
percentage of carbon-14 remains in a sample after 40,000 years.
Which ion, K+ or Ca2+, is expected to have the more negative enthalpy of hydration?
Why?
Dry ice converts directly from a solid to a gas when heated. This process is called
________.
A statement of Avogadro's hypothesis is that equal volumes of gases under the same
conditions of pressure and temperature will contain equal numbers of ________.
Oxygen and ________ are the two most abundant elements in the Earth's crust.
