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Assuming the following reaction proceeds in the forward direction,
Fe3+(aq) + Co(s) Fe2+(aq) + Co2+(aq)
A.Fe3+(aq) is oxidized and Co(s) is reduced.
B.Fe3+(aq) is oxidized and Co2+(aq) is reduced.
C.Co(s) is oxidized and Fe3+(aq) is reduced.
D.Co(s) is oxidized and Co2+(aq) is reduced.
E.Fe2+(aq) is oxidized and Co(s) is reduced.
If a chemical reaction is exothermic, but not spontaneous, which of the following must
be true?
A.DrG > 0, DrS > 0 and DrH > 0
B.DrG < 0, DrS > 0 and DrH > 0
C.DrG > 0, DrS < 0 and DrH > 0
D.DrG < 0, DrS < 0 and DrH < 0
E.DrG > 0, DrS < 0 and DrH < 0
What is the monomer of Teflon?
A.CH2CH2
B.CF2CF2
C.CH2C(CN)2
D.CH2CHCN
E.CH2CHCH3
Assuming ideal behavior, which of the following solutions should have the lowest
freezing point?
A.pure H2O
B.1.0 m MgCl2(aq)
C.1.0 m RbBr(aq)
D.1.0 m NH3(aq)
E.1.0 m C6H12O6(aq)
Calculate the activation energy, Ea, for
N2O5(g) 2 NO2(g) + 1/2 O2(g)
given k (at 45.0 C) = 5.79 10"4 s"1 and k (at 60.0 C) = 3.83 10"3 s"1. (R = 8.314 J/Kmol)
A.0.256 kJ/mol
B.2.83 kJ/mol
C.31.1 kJ/mol
D.111 kJ/mol
E.389 kJ/mol
Arrange Cl2, ICl, and Br2 in order from lowest to highest boiling point.
A.Cl2 < Br2 < ICl
B.Cl2 < ICl < Br2
C.ICl < Cl2 < Br2
D.Br2 < Cl2 < ICl
E.Br2 < ICl < Cl2
How many hydrogen atoms are present in 1.0 g of NH3?
A.0.059 atoms
B.0.18 atoms
C.3.5 1022 atoms
D.1.1 1023 atoms
E.1.2 1022 atoms
Choose which central atom in the following molecules is most electronegative.
A.PH3
B.CH4
C.H2S
D.H2O
E.NH3
For the overall reaction
A + 2B C
which of the following mechanisms yields the correct overall chemical equation and is
consistent with the rate equation below?
rate = k[A][B]
A.A + B I (fast)
I + A C (slow)
B.A + B I (slow)
I + B C (fast)
C.2B I (slow)
A + I C (fast)
D.2B I (fast)
I + A C (slow)
E.A + 2B I (fast)
I + B C + B (slow)
An impure sample of sodium carbonate, Na2CO3, is titrated with 0.113 M HCl
according to the reaction below.
2 HCl(aq) + Na2CO3(aq) CO2(g) + H2O( ) + 2 NaCl(aq)
What is the percent of Na2CO3 in a 0.613 g sample if the titration requires 26.14 mL of
HCl? The molar mass of Na2CO3 is 106.0 g/mol.
A.0.295%
B.15.7%
C.25.5%
D.51.1%
E.67.9%
The products of the complete combustion of octane, C8H18, are carbon dioxide and
water. Write a balanced chemical equation for this reaction.
A.C8H18( ) 8 C(s) + 9 H2(g)
B.C8H18( ) + 25 O2(g) 8 CO2 (g) + 9 H2O(g)
C.2 C8H18( ) + 25 O2(g) 16 CO2(g) + 18 H2O(g)
D.C8H18( ) + 16 O2(g) 8 CO2(g) + 9 H2(g)
E.2 C8H18( ) + 17 O2(g) 16 CO(g) + 18 H2O(g)
Normal boiling point is defined as
A.the temperature at which the vapor pressure of a liquid equals 1 atm.
B.the pressure at which any liquid boils at 373.15 K.
C.the temperature at which water boils in a vacuum.
D.the temperature at which the liquid and gaseous phases of a substance have equal
densities.
E.the temperature at which the enthalpy of vaporization equals 100.0 kJ/mol.
What is the correct formula for calcium nitrate?
A.CaN
B.Ca3N2
C.CaNO2
D.Ca3(NO3)2
E.Ca(NO3)2
At 50 C, the water ionization constant, Kw, is 5.48 10"14. What is the H3O+
concentration in neutral water at this temperature?
A.3.00 10"27 M
B.2.74 10"14 M
C.5.48 10"14 M
D.2.34 10"7 M
E.1.01 10"7 M
Which combination of atoms is most likely to produce a compound with ionic bonds?
A.B and C
B.S and O
C.N and F
D.Si and Cl
E.Mg and O
What 2" ion has the following ground state electron configuration?
A.oxide ion
B.nitride ion
C.fluoride ion
D.sulfide ion
E.magnesium ion
If 0.357 g of CH4 gas is introduced into an evacuated 1.75 L flask at 25 C, what is the
pressure inside the flask? (R = 0.08206 Latm/molK)
A.0.952 atm
B.0.261 atm
C.0.311 atm
D.0.419 atm
E.4.99 atm
Under certain conditions the reaction of ammonia with excess oxygen will produce a
29.5% yield of NO. What mass of NH3 must react with excess oxygen to yield 157 g
NO?
4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g)
A.89.1 g
B.302 g
C.263 g
D.26.3 g
E.938 g
At 25 C, all of the following ionic compounds produce a basic aqueous solution, except
____.
A.NaF
B.Na3PO4
C.NaNO2
D.NaHSO4
E.NaCH3CO2
What is the equilibrium constant for reaction below at 25 C? (R = 8.314 J/Kmol)
2 NO(g) + O2(g) 2 NO2(g)
given DfG [NO(g)] = +86.6 kJ/mol and DfG [NO2(g)] = +51.2 kJ/mol.
A.3.9 10"13
B.1.0
C.2.6 1012
D.1.6 106
E.3.8 1028
Potassium reacts with chlorine gas to produce potassium chloride. How many moles of
K will react with 0.40 moles of Cl2?
A.0.20 mol
B.0.32 mol
C.0.40 mol
D.0.60 mol
E.0.80 mol
Which of the following alcohols is likely to be least soluble in water?
A.3-pentanol
B.2-butanol
C.1,2-ethanediol
D.1,2,3-propanetriol
E.methanol
Chromium (atomic mass 52.00 g/mol) crystallizes in a body-centered cubic unit cell. If
the length of an edge of the unit cell is 289 pm, what is the density (in g/cm3) of
chromium?
A.3.58 g/cm3
B.7.15 g/cm3
C.13.7 g/cm3
D.14.3 g/cm3
E.21.3 g/cm3
Point D on the phase diagram is referred to as the ________ point.
A.triple
B.normal boiling
C.critical
D.normal freezing
E.divergent
The Ostwald process is an industrial method of producing ____ from the oxidation of
____.
A.nitric acid, ammonia
B.ammonia, nitric acid
C.ammonia, nitrogen
D.nitric acid, nitrogen
E.dinitrogen monoxide, nitrogen
Ions such as [Co(H2O)6]3+ and [Ag(CN)2]" are called ____.
A.ligands
B.Lewis bases
C.chelates
D.alloys
E.coordination complexes
Nitric acid, HNO3, dissociates in water to form nitrate ions and hydronium ions. What
change in hybridization of the nitrogen atom occurs in this dissociation?
A.sp2 to sp3
B.sp2 to sp
C.sp3 to sp
D.sp to sp3
E.no change
What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en =
H2NCH2CH2NH2)
A.0
B.2
C.4
D.6
E.7
Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.
A.H2SO4 (dihydrogen sulfate)
B.CH3OH (methanol)
C.CH3OCH3 (dimethyl ether)
D.HF (hydrogen fluoride)
E.CH3CO2H (acetic acid)
Which of the following statements concerning radiation absorption by living tissue
is/are CORRECT?
1/ The "quality factor" takes into account the differences in damaging power of the
various forms of radiation.
2/ One gray denotes the absorption of 1 joule per kilogram of tissue.
3/ The SI unit for biological damage is a sievert (Sv), which is determined by
multiplying grays by the quality factor.
A.1 only
B.2 only
C.3 only
D.2 and 3
E.1, 2, and 3
Nitroglycerine decomposes violently according to the chemical equation below. What
mass of carbon dioxide gas is produced from the decomposition of 5.00 g C3H5(NO3)3?
4 C3H5(NO3)3( ) 12 CO2(g) + 6 N2(g) +10 H2O(g) + O2(g)
A.15.0 g
B.0.969 g
C.11.6 g
D.2.91 g
E.0.323 g
The most reactive nonmetallic element is ____. This element has been shown to form
compounds with every other element except He and Ne.
A.oxygen
B.fluorine
C.lithium
D.phosphorus
E.carbon
Which 1+ ion has the ground state electron configuration [Kr]4d10?
A.Ru
B.Au
C.Ag
D.In
E.Cd
