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A 25.0 mL sample of 0.400 M NH3(aq) is titrated with 0.400 M HCl(aq). What is the
pH at the equivalence point? (Kb of NH3 = 1.8 10"5)
A.2.72
B.4.97
C.7.00
D.9.03
E.11.28
Non-ideal behavior for a gas is most likely to be observed under conditions of
A.high temperature and low pressure.
B.high temperature and high pressure.
C.low temperature and low pressure.
D.standard temperature and pressure.
E.low temperature and high pressure.
What is the name of the following compound?
A.1,1,1-trimethylbutane
B.3-butylpropane
C.2-methyl-2-propylpropane
D.4,4-dimethylpentane
E.2,2-dimethylpentane
If the fuel efficiency of an automobile is 32 miles per gallon, what is its fuel efficiency
in kilometers per liter? (1 km = 0.621 mile, 1.000 L = 1.057 quarts, 4 quarts = 1 gallon)
A.5.3 km/L
B.14 km/L
C.20 km/L
D.75 km/L
E.2.0 102 km/L
Determine the enthalpy change for the oxidation of ethanol to acetic acid,
CH3CH2OH( ) + O2(g) CH3COOH( ) + H2O( )
given the thermochemical equations below.
2 CH3CH2OH( ) + O2(g) 2 CH3CHO( ) + 2 H2O( ) DrH = "400.8 kJ/mol-rxn
2 CH3CHO( ) + O2(g) 2 CH3COOH( ) DrH = "584.4 kJ/mol-rxn
A."985.2 kJ/mol-rxn
B."492.6 kJ/mol-rxn
C."183.6 kJ/mol-rxn
D.+183.6 kJ/mol-rxn
E.+492.6 kJ/mol-rxn
What is the relationship between Kp and Kc for the reaction below?
N2(g) + 3 H2(g) 2 NH3(g)
A.
B.
C.
D.
E.
What is the net ionic equation for the reaction of aqueous nickel(II) acetate and aqueous
sodium carbonate?
A.Ni2+(aq) + 2 CH3CO2
"(aq) Ni(CH3CO2)2(s)
B.Na+(aq) + CH3CO2
"(aq) NaCH3CO2(aq)
C.Na+(aq) + CH3CO2
"(aq) NaCH3CO2(s)
D.Ni2+(aq) + CO3
2"(aq) NiCO3(s)
E.Ni2+(aq) + 2 Na+(aq) NiNa2(s)
Given the following reactions,
AgBr(s) Ag+(aq) + Br"(aq) Ksp = 5.4 10"13
Ag+(aq) + 2 CN"(aq) Ag(CN)2
"(aq) Kf = 1.2 1021
determine the equilibrium constant for the reaction below.
AgBr(s) + 2 CN"(aq) Ag(CN)2
"(aq) + Br"(aq)
A.4.5 10"34
B.1.5 10"9
C.6.5 108
D.1.2 1021
E.2.2 1033
Calculate DrG for the following reaction at 425 C,
2 HI(g) H2(g) + I2(g)
given K = 0.018. (R = 8.314 J/Kmol)
A.6.12 103 J
B.1.05 104 J
C.1.42 104 J
D.2.33 104 J
E.3.34 105 J
Uranium-235 has a half-life of 7.04 108 years. How many years will it take for 99.9%
of a U-235 sample to decay?
A.7.0 105 yr
B.1.0 106 yr
C.4.7 109 yr
D.4.9 109 yr
E.7.0 109 yr
If an ionic compound with the formula MX2 forms a face-centered cubic unit cell with
the cations (M2n+) at the lattice points, the anions (Xn") will occupy
A.all of the tetrahedral holes in each unit cell.
B.half of the tetrahedral holes in each unit cell.
C.all of the octahedral holes in each unit cell.
D.the center of each face in each unit cell.
E.the cubic hole in the center of the each unit cell.
The vapor pressure of pure water at 15 C is 12.8 mm Hg. What is the equilibrium vapor
pressure of water above a mixture of 72.0 g ethanol (CH3CH2OH, molar mass = 46.07
g/mol) and 22.0 g water?
A.2.84 mm Hg
B.5.61 mm Hg
C.7.19 mm Hg
D.10.0 mm Hg
E.12.8 mm Hg
A 30.00 mL sample of vinegar is titrated with 0.4190 M NaOH(aq). If the titration
requires 27.83 mL of NaOH(aq), what is the concentration of acetic acid in the vinegar?
A.0.1931 M
B.0.2016 M
C.0.2174 M
D.0.3887 M
E.0.4517 M
The n = ____ shell is the lowest that may contain f-orbitals.
A.2
B.3
C.4
D.5
E.6
A linear relationship exists between the natural logarithm of the vapor pressure of a gas
and the reciprocal of its temperature (in kelvin). What is the slope of the line?
A.
B.
C.T
D.
E.
You can identify a metal by carefully determining its density. A 7.969 g cylinder of an
unknown metal is 2.00 cm long and has a diameter of 0.755 cm. What is a possible
identity of the element? (Volume = pr2h)
A.silver, 10.5 g/cm3
B.iridium, 22.4 g/cm3
C.gold, 19.3 g/cm3
D.lead, 11.4 g/cm3
E.nickel, 8.90 g/cm3
Which process requires the greatest endothermic change in enthalpy for water?
A.freezing
B.condensation
C.sublimation
D.melting
E.vaporization
What is the correct formula for iron(II) nitrate?
A.Fe2(NO3)2
B.Fe2NO3
C.Fe(NO3)2
D.Fe3N2
E.FeNO3
Which of the following statements is correct for the first-order reaction: A 2B?
A.The concentration of A decreases linearly with respect to time.
B.The concentration of A is constant with respect to time.
C.The natural logarithm of the concentration of A decreases linearly with respect to
time.
D.The rate of reaction is constant with respect to time.
E.The rate constant,k, of the reaction decreases linearly with respect to time.
Molecules or ions that can alternately behave as either a Brnsted-Lowry acid or base are
called
A.polyanions.
B.hydronium ions.
C.polyprotic acids or bases.
D.conjugate acids or bases.
E.amphiprotic.
Sodium sulfate has the chemical formula Na2SO4. Based on this information, the
formula for chromium(III) sulfate is ____.
A.CrSO4
B.Cr(SO4)3
C.Cr2(SO4)3
D.Cr2SO4
E.Cr3(SO4)2
The product of the oxidation of iron in most soil in the absence of excess oxygen is
black magnetite. The chemical formula of this compound is ____.
A.FeO
B.FeO2
C.Fe2O3
D.Fe3O2
E.Fe3O4
The radius of an indium atom is 0.163 nm. If indium crystallizes in a face-centered unit
cell, what is the length of an edge of the unit cell?
A.0.188 nm
B.0.231 nm
C.0.326 nm
D.0.376 nm
E.0.461 nm
Complete the following fission reaction.
A.
B.
C.
D.
E.
What is the pH of 0.50 M aqueous ethylamine? (Kb of C2H5NH2 = 4.3 10"4)
A.1.84
B.3.37
C.10.33
D.10.63
E.12.16
Which statement concerning relative rates of reaction is correct for the chemical
equation given below?
2 CH3OH(g) + 3 O2(g) 2 CO2(g) + 4 H2O(g)
A.The rate of disappearance of CH3OH is equal to the rate of disapperance of O2.
B.The rate of disappearance of CH3OH is two times the rate of appearance of H2O.
C.The rate of disappearance of CH3OH is half the rate of appearance of CO2.
D.The rate of appearance of H2O is two times the rate of appearance of CO2.
E.The rate of appearance of H2O is four times the rate of disappearance of CH3OH.
An arsenic atom has ____ valence electrons.
A.3
B.5
C.6
D.8
E.33
Which of the following elements has the most negative electron affinity?
A.Cs
B.Li
C.O
D.Cl
E.F
The reaction of 0.779 g K with O2 forms 1.417 g potassium superoxide, a substance
used in self-contained breathing devices. Determine the formula for potassium
superoxide.
A.KO2
B.KO
C.K2O3
D.K2O
E.KO4
When 0.5000 grams of an unknown hydrocarbon, CxHy, is completely combusted with
excess oxygen, 1.037 L CO2 gas and is produced at 98.3 C and 1.000 atm. What is the
empirical formula of the hydrocarbon? (R = 0.08206 Latm/molK)
A.CH
B.CH2
C.C2H3
D.C3H5
E.C3H8
If a nucleus decays by successive a, b, b particle emissions, its atomic number will
A.decrease by four.
B.decrease by two.
C.increase by four.
D.increase by two.
E.be unchanged.
Predict which ionic compound has the highest melting point.
A.KBr
B.MgO
C.RbI
D.CaBr2
E.CsCl
Which is NOT an amphiprotic species in water?
A.HClO3
B.HSO3
"
C.H3O+
D.HS"
E.HCO3
"
At 75.0 C, water has an equilibrium vapor pressure of 289.1 mm Hg. If 4.22 g H2O is
sealed in an evacuated 5.00 L flask and heated to 75.0 C, what mass of H2O will be
found in the gas phase when liquid-vapor equilibrium is established? Assume any liquid
remaining in the flask has a negligible volume. (R = 0.08206 Latm/molK, 1 atm = 760
mm Hg)
A.0.240 g
B.1.20 g
C.2.64 g
D.3.02 g
E.4.22 g
