Calculate for the electrochemical cell below,
Ag(s) | AgCl(s) | Cl“(aq) || Cu2+(aq) | Cu(s)
given the following standard reduction potentials.
Cu2+(aq) + 2 e“ Cu(s) E = +0.337 V
AgCl(s) + e“ Ag(s) + Cl“(aq) E = +0.222 V
A.”0.115 V
B.”0.107 V
C.+0.115 V
D.+0.452 V
E.+0.559 V
What is the maximum number of electrons that can occupy the n = 3 shell?
A.4
B.8
C.18
D.32
E.50
What intermolecular force(s) is/are present in solid SO3?
1/ induced dipole/induced dipole
2/ dipole-dipole
3/ hydrogen bonding
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1 and 3
At what temperatures will a reaction be spontaneous if DrH = +62.4 kJ and DrS = +301
J/K?
A.All temperatures below 207 K.
B.All temperatures above 207 K.
C.Temperatures between 179 K and 235 K.
D.The reaction will be spontaneous at any temperature.
E.The reaction will never be spontaneous.
At 800 K, the equilibrium constant, Kp, for the following reaction is 3.2 10“7.
2 H2S(g) 2 H2(g) + S2(g)
A reaction vessel at 800 K initially contains 3.00 atm of H2S. If the reaction is allowed
to equilibrate, what is the equilibrium pressure of S2?
A.8.5 10“5 atm
B.6.2 10“3 atm
C.9.0 10“3 atm
D.1.1 10“2 atm
E.1.4 10“2 atm
Which of the following statements is INCORRECT?
A.Quartz is a form of silicon dioxide that is used for controlling the frequency of radio
and television transmissions.
B.Silica gel, a noncrystalline for of SiO2, is used to keep electronics dry.
C.Passing beer through a bed of silica gel removes small particles that cause cloudiness.
D.Gaseous SiO2 is a linear molecule with silicon-oxygen double bonds and a boiling
point slight below 0 C.
E.Silicon dioxide is resistant to attack from all acids except HF.
Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy.
What is the empirical formula for an oxide that contains 30.44% by mass nitrogen?
A.N2O
B.NO
C.NO2
D.N2O3
E.N2O5
Calculate DrG for the reaction below at 25.0 C
CS2(g) + 3 Cl2(g) S2Cl2(g) + CCl4(g)
given DrH = “231.1 kJ/mol-rxn and DrS = “287.6 J/Kmol-rxn.
A.”518.7 kJ/mol-rxn
B.”316.9 kJ/mol-rxn
C.”145.3 kJ/mol-rxn
D.”56.5 kJ/mol-rxn
E.+56.5 kJ/mol-rxn
The Ksp of AgI is 8.5 10“17 at 25 C. Calculate the molar solubility of AgI in 0.0045 M
KI(aq) at 25 C.
A.1.9 10“14 mol/L
B.3.8 10“12 mol/L
C.9.2 10“9 mol/L
D.1.4 10“7 mol/L
E.2.0 10“6 mol/L
Which of the following isotopes is used in the treatment of thyroid disorders?
A.
B.
C.
D.
E.
All of the following are oxidation-reduction reactions EXCEPT
A.CaCO3(s) CaO(s) + CO2(g)
B.2 Na(s) + Br2(g) 2 NaBr(g)
C.Fe(s) + 2 HCl(aq) FeCl2(aq) + H2(g)
D.2 C(s) + O2(g) 2 CO(g)
E.2 H2O( ) 2 H2(g) + O2(g)
A mass of 1.37 g of an unknown gas is introduced into an evacuated 1.70 L flask. If the
pressure in the flask is 0.814 atm at 98 C, which of the following gases might be in the
flask? (R = 0.08206 Latm/molK)
A.CH4
B.C2H2
C.C2H6
D.C3H8
E.C4H10
If the complete combustion of an unknown mass of ethylene produces 16.0 g CO2, what
mass of ethylene is combusted?
C2H4(g) + 3 O2(g) 2 CO2(g) + 2 H2O(g)
A.0.182 g
B.0.364 g
C.5.10 g
D.8.00 g
E.12.6 g
A 15 meter by 12 meter pool of water has a depth of 2.2 meters. What mass of silver ion
is present in the reservoir if the concentration of silver ion is 0.14 ppm? (1 m3 = 1000 L;
assume the density of the solution is 1.00 g/mL)
A.5.5 10“4 g
B.5.5 10“2 g
C.0.55 g
D.5.5 g
E.55 g
If a nucleus gains a neutron and then undergoes beta emission,
A.its atomic number decreases by one and its mass number increases by one.
B.its atomic number is unchanged and its mass number increases by one.
C.both its atomic number and its mass number are unchanged.
D.its atomic number increases by one and its mass number is unchanged.
E.its atomic number increases by one and its mass number increases by one.
What is the ground state electron configuration for Sn2+?
A.[Kr]4d105s2
B.[Kr]4d105p2
C.[Kr]5s2
D.[Kr]4d105s25p2
E.[Kr]4d105s25p4
Hydrogen gas is a non-polluting fuel. Hydrogen gas may be prepared by electrolysis of
water.
2 H2O( ) 2 H2(g) + O2(g)
Predict the signs of DrH and DrS for the production of hydrogen gas by electrolysis of
water.
A.DrH > 0 and DrS > 0
B.DrH < 0 and DrS > 0
C.DrH > 0 and DrS < 0
D.DrH < 0 and DrS < 0
E.DrH = 0 and DrS < 0
The mass of a 16.0 ounce soda can filled with mercury is 6.39 kg. What is the density
of mercury? Assume the can has no mass. (1.00 oz = 29.6 mL, 1.00 mL = 1.00 cm3)
A.3.45 g/cm3
B.21.6 g/cm3
C.13.5 g/cm3
D.399 g/cm3
E.1.18 104 g/cm3
Write a balanced chemical equation for the roasting of CuS.
A.CuS(s) + 2 HCl(aq) CuCl2(aq) + H2(g) + S(s)
B.CuS(s) + O2(g) CuO2(s) + S(s)
C.CuS(s) + O2(g) CuO(s) + SO(g)
D.CuS(s) + 2 HCl(aq) CuCl2(aq) + H2S(g)
E.2 CuS(s) + 2 O2(g) 2 CuO(s) + SO2(g)
Acetylene, C2H2, is a gas used in welding. The molar enthalpy of combustion for
acetylene is “2599 kJ. A mass of 0.338 g C2H2(g) is combusted in a bomb calorimeter.
If the heat capacity of the calorimeter is 729 J/K and it contains 1.150 kg of water, what
is the temperature increase of the bomb calorimeter? The specific heat capacity of water
is 4.184 J/gK and the molar mass of acetylene is 26.04 g/mol.
A.1.59 K
B.6.09 K
C.7.01 K
D.12.3 K
E.18.0 K
The solubility of BaCrO4(s) in water is 3.7 milligrams in 1.0 L at 25 C. What is the
value of Ksp for BaCrO4?
A.2.1 10“10
B.8.6 10“10
C.1.4 10“5
D.1.5 10“5
E.2.9 10“5
Which of the following statements is/are CORRECT?
1/ A system is defined as an object or collection of objects being studied.
2/ Surroundings are defined as the entire universe, including the system.
3/ In an endothermic reaction, heat is transferred from the system to the surroundings.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
If a hydrogen atom in the excited n = 4 state relaxes to the ground state, what is the
maximum number of possible emission lines?
A.1
B.4
C.6
D.8
E.infinite
If 0.50 L of a buffer containing 1.0 mol H2PO4
– and 1.0 mol HPO4
2- is diluted to a
volume of 5.0 L, the pH
A.increases by 1.
B.decreases by 1.
C.increases by 10.
D.decreases by 10.
E.remains unchanged.
A molecule is found to contain 47.35% by mass C, 10.60% by mass H, and 42.05% by
mass O. What is the empirical formula for this molecule?
A.C2H6O
B.C3H4O
C.C3H8O2
D.C4H6O2
E.C4H8O3
An aqueous mixture of phenol and ammonia has initial concentrations of 0.200 M
C6H5OH(aq) and 0.120 M NH3(aq). At equilibrium, the C6H5O“(aq) concentration is
0.050 M. Calculate K for the reaction.
C6H5OH(aq) + NH3(aq) C6H5O“ + NH4
+(aq)
A.0.10
B.0.24
C.2.1
D.4.2
E.4.8
Identify the ions in CaHPO4.
A.Ca2+ and PO4
3″
B.Ca2+ and HPO4
2″
C.Ca+ and HPO4
“
D.Ca3+ and HPO4
3″
E.Ca2+, H+, P3″, and O2″
Place the following gases in order of increasing average velocity at 300 K: Ar, CH4, N2,
and N2O.
A.Ar = CH4 = N2 = N2O
B.N2O < Ar < N2 < CH4
C.N2O < N2 < CH4 < Ar
D.Ar < N2 < N2O < CH4
E.CH4 < N2 < N2O < Ar
Which of the following elements undergoes nuclear fusion to provide the primary
source of energy from the sun?
A.helium
B.uranium
C.hydrogen
D.carbon
E.boron
If astatine-207 decays by a emission, followed by a emission, followed by electron
capture, what nucleus is produced?
A.
B.
C.
D.
E.
Which two of the atoms below have the same number of neutrons?
A. and
B. and
C. and
D. and
E. and
Calculate Ecell for the following electrochemical cell at 25 C
Pt(s) | H2(g, 1.00 atm) | H+(aq, 1.00 M) || Sn2+(aq, 0.350 M), Sn4+(aq, 0.020 M) | Pt(s)
given the following standard reduction potentials.
Sn4+(aq) + 2 e“ Sn2+(s) E = +0.15 V
2 H+(aq) + 2 e“ H2(g) E = 0.00 V
A.”0.19 V
B.+0.08 V
C.+0.11 V
D.+0.19 V
E.+0.22 V
As one moves horizontally from left to right across a period, the effective ________
charge increases, resulting in decreasing atomic radii.
In valence bond theory, each sigma bond in CH4 is formed from the overlap of a
hydrogen atom’s 1s orbital with a(n) ________ hybridized orbital on the carbon atom.
Because ________ particles are relatively large (say, 1000 nm in diameter) they scatter
visible light, making the mixtures containing these particles appear cloudy. This
scattering is known as the Tyndall effect.
When a Lewis acid and a Lewis base combine, the product may be referred to as an
acid-base ________.
The chemical equations below show the reaction of Al(OH)3 as a Lewis acid and as a
Lewis base, respectively.
Al(OH)3(s) + OH“(aq) Al(OH)4
“(aq)
Al(OH)3(s) + 3 H3O+(aq) Al3+(aq) + 3 H2O( )
Substances that can behave as either Lewis acids or bases are called ________
substances.
________ are colloidal dispersions of one liquid in another liquid.
Explain the treatment named boron neutron capture therapy (BNCT).
Radioactive isotopes decay by ________-order kinetics.
The symbol Q is called the ________.
A(n) ________ agent loses electrons in an oxidation-reduction reaction.
If a catalyst is present in a different phase from the reactants and products, it is referred
to as a(n) ________ catalyst.
________ is a measure of the degree to which the electron cloud surrounding an atom
or molecule can be distorted in an electric field.
Gold and platinum are commonly used as inert electrodes in laboratory experiments. In
commercial applications, such as batteries, ________ is more commonly used for inert
electrodes because it is far less expensive.
Two important allotropes of phosphorus are white phosphorus and red phosphorus.
White phosphorus, P4, has a melting point of 44.1 C and spontaneously reacts with
oxygen. Red phosphorus, a network solid, melts at 280 C and is stable in air. Use your
knowledge of intermolecular and intramolecular bonding to explain why these two
forms of the same element have such different properties.