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Which molecule in the reaction below is the oxidizing agent?
2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g)
A.C2H6
B.O2
C.H2O
D.CO2
E.None
What is the pH of a buffer that results when 0.50 mole of H3PO4 is mixed with 0.25
mole of NaOH and diluted with water to 1.00 L? (The acid dissociation constants of
phosphoric acid are Ka1 = 7.5 10"3, Ka2 = 6.2 10"8, and Ka3 = 3.6 10"13)
A.1.82
B.2.12
C.6.91
D.7.21
E.12.44
Sulfur trioxide reacts with water to produce sulfuric acid. What change in hybridization
of the sulfur atom occurs in this reaction?
A.sp3 to sp2
B.sp3 to sp
C.sp2 to sp3
D.sp2 to sp3d2
E.no change
What volume of Ar at 45 C and 1.25 atm contains the same number of particles as 0.655
L of H2 at 15 C and 2.00 atm?
A.0.452 L
B.1.16 L
C.0.949 L
D.0.371 L
E.3.14 L
Determine the equilibrium constant for the following reaction
Mg(OH)2(s) + 2 H+(aq) Mg2+(aq) + 2 H2O( )
given the chemical reactions below.
Mg(OH)2(s) Mg2+(aq) + 2 OH"(aq) K = 5.6 10"12
H2O( ) H+(aq) + OH"(aq) K = 1.0 10"14
A.1.1 10"25
B.5.6 10"12
C.5.6 102
D.1.1 103
E.5.6 1016
Which of the following colors of visible light has the lowest frequency?
A.green
B.orange
C.red
D.yellow
E.blue
What is the binding energy of an electron in a photosensitive metal (in kJ/mol) if the
longest wavelength of light that can eject electrons from the metal is 198 nm?
A.279 kJ/mol
B.604 kJ/mol
C.792 kJ/mol
D.1.51 1012 kJ/mol
E.6.04 10"20 kJ/mol
The point of maximum stability in the binding energy curve occurs in the vicinity of
which one of the following isotopes?
A.
B.
C.
D.
E.
Which of the following statements is/are CORRECT?
1/ Spontaneous changes only occur in the direction that leads to equilibrium.
2/ Exothermic reactions are always spontaneous.
3/ In any chemical reaction, energy must be conserved.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
Heat capacity is defined as
A.the amount of heat required to raise the temperature of 1 gram of substance by 1 K.
B.the amount of heat required to raise the temperature of a substance by 1 K.
C.the amount of heat required to vaporize a solid or liquid.
D.the maximum amount of heat that a substance may absorb without decomposing.
E.4.18 cal/gK.
If 35.0 g H2O at 22.7 C is combined with 65.0 g H2O at 87.5 C, what is the final
temperature of the mixture? The specific heat capacity of water is 4.184 J/gK.
A.25.1 C
B.45.4 C
C.50.8 C
D.64.8 C
E.48.9 C
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36
hours, what mass of aluminum is deposited at the electrode? Assume 100% current
efficiency.
A.9.2 10"3 g
B.3.3 101 g
C.9.9 101 g
D.1.0 102 g
E.3.0 102 g
Which of the following atoms contains the fewest protons?
A.232Th
B.231Pa
C.245Pu
D.238U
E.232Pa
Which of the following compounds may have linkage isomers?
A.[Ni(H2O)4Cl2]Cl
B.[Ni(NH3)4Cl2]NO2
C.[Ni(H2O)5(SCN)]SO4
D.[Ni(H2O)5Cl](SCN)2
E.[Ni(NH3)4Cl2]Cl
If 3.01 g of water is sealed in an evacuated 2.00 L flask and heated to the normal
boiling point of 373 K, what is the pressure in the flask? (R = 0.08206 Latm/molK)
A.0.391 atm
B.0.678 atm
C.1.00 atm
D.2.56 atm
E.46.1 atm
Diagram 9-1
The molecular orbital diagram below may be used for the following problem(s). For
oxygen and fluorine, the s2p orbital should be lower in energy than the p2p. However,
the diagram will still yield correct bond order and magnetic behavior for these
molecules.
Energy ________ s*2p
________ ________ p*2p
________ s2p
________ ________ p2p
________ s*2s
________ s2s
________ s*1s
________ s1s
Refer to Diagram 9-1. Use molecular orbital theory to predict which species is
paramagnetic.
A.N2
B.B2
C.F2
D.Li2
E.H2
A sealed tube is prepared with 1.66 atm PCl5 at 500 K. The PCl5 decomposes until
equilibrium is established.
PCl5(g) PCl3(aq) + Cl2(g)
The equilibrium pressure in the tube is 2.28 atm. Calculate Kp.
A.0.17
B.0.23
C.0.37
D.0.62
E.4.3
If 50.0 g of benzene, C6H6, at 25.0 C absorbs 2.71 kJ of energy in the form of heat,
what is the final temperature of the benzene? The specific heat capacity of benzene is
1.72 J/gK.
A.25.0 C
B.31.5 C
C.56.5 C
D.32.3 C
E.57.3 C
Calculate the standard entropy change for the combustion of ethanol at 25 C.
CH3CH2OH( ) + 3 O2(g) 2 CO2(g) + 3 H2O(g)
Species S (J/Kmol)
CH3CH2OH( ) 160.7
O2(g) 205.1
CO2(g) 213.7
H2O(g) 188.8
A."35.9 J/K
B.+35.9 J/K
C.+217.8 J/K
D.+422.9 J/K
E.+833.1 J/K
Which of the following molecules or ions is the strongest acid?
A.CH3CO2
"
B.CH3CO2H
C.CFH2CO2H
D.CF2HCO2H
E.CF3CO2H
The wavelength of light emitted from a particular red diode laser is 651 nm. What is the
wavelength in meters?
A.6.51 1011 m
B.6.51 10"2 m
C.6.51 10"4 m
D.6.51 10"7 m
E.6.51 10"9 m
What is the atomic symbol for an element with 39 protons and 50 neutrons?
A.
B.
C.
D.
E.
Given the following chemical equilibrium,
COCl2(g) CO(g) + Cl2(g)
calculate the value of Kc, given that Kp = 6.5 1011 at 298 K. (R = 0.08206 Latm/molK)
A.1.5 10"12
B.3.8 10"11
C.1.1 109
D.2.7 1010
E.1.6 1013
Rank the subatomic particles from least to greatest mass.
A.electron mass = proton mass = neutron mass
B.electron mass = neutron mass < proton mass
C.electron mass = proton mass < neutron mass
D.electron mass < proton mass < neutron mass
E.electron mass < proton mass = neutron mass
Determine the standard enthalpy of formation of Fe2O3(s) given the thermochemical
equations below.
Fe(s) + 3 H2O( ) Fe(OH)3(s) + 3/2 H2(g) DrH = +160.9 kJ/mol-rxn
H2(g) + 1/2 O2(g) H2O( ) DrH = "285.8 kJ/mol-rxn
Fe2O3(s) + 3 H2O( ) 2 Fe(OH)3(s) DrH = +288.6 kJ/mol-rxn
A."252.6 kJ/mol-rxn
B.+163.7 kJ/mol-rxn
C."824.2 kJ/mol-rxn
D.+33.2 kJ/mol-rxn
E.+ 890.6 kJ/mol-rxn
What is the mass percent of each element in sulfuric acid, H2SO4?
A.2.055% H, 32.69% S, 65.25% O
B.1.028% H, 32.69% S, 66.28% O
C.28.57% H, 14.29% S, 57.17% O
D.1.028% H, 33.72% S, 65.25% O
E.2.016% H, 32.07% S, 65.91% O
How many alcohols have the formula C4H10O?
A.2
B.3
C.4
D.5
E.6
Which element has the ground state electron configuration [Ar]3d104s1?
A.Cu
B.Zn
C.Ge
D.Ag
E.Cd
Calculate for the reaction below,
5 Cd(s) + 2 MnO4
"(aq) + 16 H+(aq) 5 Cd2+(aq) + 2 Mn2+(aq) + 8 H2O( )
given the following standard reduction potentials.
MnO4
"(aq) + 8 H+(aq) + 5 e" Mn2+(aq) + 4 H2O( ) E = +1.52 V
Cd2+(aq) + 2 e" Cd(s) E = "0.40 V
A."1.12 V
B.+1.04 V
C.+1.92V
D.+5.04 V
E.+8.40 V
Which of the following are resonance structures for formate ion, HCO2
"?
A.1 and 2
B.2 and 3
C.3 and 4
D.1, 3, and 4
E.2, 3, and 4
Buckminsterfullerene is a molecule composed of sixty ________ atoms.
Concentrated nitric acid reacts with copper to form NO2(g). Dilute nitric acid reacts
with copper to form NO(g). Why does the reaction involving the dilute acid give a
different nitrogen oxide than the concentrated acid?
Use the standard entropies for liquid water and steam to estimate the enthalpy of
vaporization of water at its normal boiling point. DS [H2O( )] = 69.9 J/Kmol and DS
[H2O(g)] = 188.8 J/Kmol.
The molecular geometry of a molecule whose central atom has four single bonds and
one lone pair of electrons is ________.
The change in entropy for any process is not dependent upon the pathway by which the
process occurs. In other words, the change in entropy for any process is a(n) ________
function.
A solution is a homogeneous mixture composed of one or more ____________
dissolved in a solvent.
The numbers preceding the formulas in chemical equations are referred to as the
________ coefficients.
Does the formation of complex molecules such as proteins and nucleic acids from more
simple molecules contradict the second law of thermodynamics?
The rate of effusion of a gas is inversely proportional to the square root of its ________.
The process by which long chain hydrocarbons in petroleum are shortened is called
________.
Explain the difference between paramagnetic and ferromagnetic.
Robert Boyle observed that the volume of a fixed amount of gas is inversely
proportional to its ________.
Which of the following statements is/are CORRECT?
A joule is defined as the energy required to change 1.00 g of water from 14.5 C to 15.5
C.
One calorie (c) equals 4.184 J, where the joule (J) is the SI unit of energy.
A calorie (c) is equal to 1000 dietary calories (C).
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
In an electrolytic cell, reduction occurs at the ________ and oxidation occurs at the
________.
For a monoprotic acid titration, the ________ point in a titration is the point where the
moles of strong base added equals the moles of acid initially present.
What are the names of four metalloids?
In vulcanized rubber, the polymer chains of natural rubber are cross-linked with sulfur
atoms. The polymer chains stretch when stressed, but they return to their original shape
when the stress is removed. Substances that behave this way are called ________.
The pH of purified water (or of a neutral solution) is _____.
The hybridization of the xenon atom in XeOF4 is ________.
