Question 1

is reduced in the following reaction:

Accepted Answer

A)  Cr2O72-  
B)  S4O62-  
C)  H+  
D)  S2O32-  
E)  Cr3+ 
A)  Cr2O72-  
B)  S4O62-  
C)  H+  
D)  S2O32-  
E)  Cr3+

Question 2

One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell
)

Accepted Answer

A)  oxidation occurs at the cathode 
B)  an electric current is produced by a chemical reaction 
C)  O2 gas is produced at the cathode 
D)  electrons flow toward the anode 
E)  a nonspontaneous reaction is forced to occur 
A)  oxidation occurs at the cathode 
B)  an electric current is produced by a chemical reaction 
C)  O2 gas is produced at the cathode 
D)  electrons flow toward the anode 
E)  a nonspontaneous reaction is forced to occur

Question 3

Corrosion of iron is retarded by .

Accepted Answer

A)  high pH conditions 
B)  low pH conditions 
C)  the presence of salts 
D)  both the presence of salts and high pH conditions 
E)  both the presence of salts and low pH conditions 
A)  high pH conditions 
B)  low pH conditions 
C)  the presence of salts 
D)  both the presence of salts and high pH conditions 
E)  both the presence of salts and low pH conditions

Question 4

The standard emf for the cell using the overall cell reaction below is +2.20 V:
 
The emf generated by the cell when [Al3+] = 4.5 × 10- 3 M and [I- ] = 0.15 M is V.

Accepted Answer

A)  2.30 
B)  2.23 
C)  2.39 
D)  2.10 
E)  2.20 
A)  2.30 
B)  2.23 
C)  2.39 
D)  2.10 
E)  2.20

Question 5

The most difficult species to reduce and the poorest oxidizing agent is _ .

Accepted Answer

The answer of The most difficult species to reduce and...

Question 6

At constant temperature and pressure the Gibbs free energy value is a measure of the
of a process.

Accepted Answer

The answer of At constant temperature and pressure the Gibbs...

Question 7

Which transformation could take place at the cathode of an electrochemical cell?

Accepted Answer

A)  Br2 - BrO3- 
B)  NO - HNO2 
C)  MnO2 - MnO4- 
D)  HSO4-  -H2SO3 
E)  Mn2+ - MnO4- 
A)  Br2 - BrO3- 
B)  NO - HNO2 
C)  MnO2 - MnO4- 
D)  HSO4-  -H2SO3 
E)  Mn2+ - MnO4-

Question 8

Galvanized iron is iron coated with .

Accepted Answer

A)  phosphate. 
B)  iron oxide. 
C)  chromium. 
D)  zinc. 
E)  magnesium. 
A)  phosphate. 
B)  iron oxide. 
C)  chromium. 
D)  zinc. 
E)  magnesium.

Question 9

In a voltaic cell, electrons flow from the to the .

Accepted Answer

A)  anode, salt bridge 
B)  salt bride, anode 
C)  anode, cathode 
D)  salt bridge, cathode 
E)  cathode, anode 
A)  anode, salt bridge 
B)  salt bride, anode 
C)  anode, cathode 
D)  salt bridge, cathode 
E)  cathode, anode

Question 10

Which of the halogens in Table 20.1 is the strongest oxidizing agent?

Accepted Answer

A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  All of the halogens have equal strength as oxidizing agents. 
A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  All of the halogens have equal strength as oxidizing agents.

Question 11

The balanced half- reaction in which dichromate ion is reduced to chromium(III) ion is a
Process.

Accepted Answer

A)  four- electron 
B)  six- electron 
C)  three- electron 
D)  two- electron 
E)  twelve- electron 
A)  four- electron 
B)  six- electron 
C)  three- electron 
D)  two- electron 
E)  twelve- electron

Question 12

The balanced half- reaction in which chlorine gas is reduced to the aqueous chloride ion is a
Process.

Accepted Answer

A)  three- electron 
B)  four- electron 
C)  two- electron 
D)  six- electron 
E)  one- electron 
A)  three- electron 
B)  four- electron 
C)  two- electron 
D)  six- electron 
E)  one- electron

Question 13

A voltaic cell is constructed with two silver- silver chloride electrodes, where the half- reaction is   The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively.
The cell emf is V.

Accepted Answer

A)  22.2 
B)  0.232 
C)  0.118 
D)  0.00222 
E)  0.212 
A)  22.2 
B)  0.232 
C)  0.118 
D)  0.00222 
E)  0.212

Question 14

Which one of the following types of elements is most likely to be a good oxidizing agent?

Accepted Answer

A)  alkali metals 
B)  transition elements 
C)  halogens 
D)  alkaline earth elements 
E)  lanthanides 
A)  alkali metals 
B)  transition elements 
C)  halogens 
D)  alkaline earth elements 
E)  lanthanides

Question 15

The town of Natrium, West Virginia, derives its name from the sodium produced in the electrolysis of molten sodium chloride (NaCl) mined from ancient salt deposits. The number of kilowatt- hours of electricity required to produce 4.60 kg of metallic sodium from the electrolysis of molten NaCl(s) is when the applied emf is 4.50 V.

Accepted Answer

A)  48.3 
B)  12.1 
C)  0.0241 
D)  0.0414 
E)  24.1 
A)  48.3 
B)  12.1 
C)  0.0241 
D)  0.0414 
E)  24.1

Question 16

In a voltaic cell electrons flow from the anode to the cathode.

Accepted Answer

A) True 
 B)False

Question 17

How many grams of CuS are obtained by passing a current of 12 A through a solution of CuSO4 for 15 minutes ?

Accepted Answer

A)  7.1 
B)  14 
C)  1.8 
D)  3.6 
E)  0.016 
A)  7.1 
B)  14 
C)  1.8 
D)  3.6 
E)  0.016

Question 18

The potential (E) to move K+ from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is _ _.

Accepted Answer

Question 19

How many seconds are required to produce 4.00 g of aluminum metal from the electrolysis of molten AlCl3 with an electrical current of 12.0 A?

Accepted Answer

A)  27.0 
B)  3.57 × 103  
C)  1.19 × 103  
D)  9.00 
E)  2.90 × 105 
A)  27.0 
B)  3.57 × 103  
C)  1.19 × 103  
D)  9.00 
E)  2.90 × 105

Question 20

How many kilowatt- hours of electricity are used to produce 3.00 kg of magnesium in the electrolysis of molten MgCl2 with an applied emf of 4.50 V?

Accepted Answer

A)  7.4 
B)  14.9 
C)  0.0336 
D)  0.0298 
E)  29.8 
A)  7.4 
B)  14.9 
C)  0.0336 
D)  0.0298 
E)  29.8

Exam 20: Electrochemistry

is reduced in the following reaction:

One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell )

Corrosion of iron is retarded by .

The standard emf for the cell using the overall cell reaction below is +2.20 V: The emf generated by the cell when [Al3+] = 4.5 × 10- 3 M and [I- ] = 0.15 M is V.

The most difficult species to reduce and the poorest oxidizing agent is _ .

At constant temperature and pressure the Gibbs free energy value is a measure of the of a process.

Which transformation could take place at the cathode of an electrochemical cell?

Galvanized iron is iron coated with .

In a voltaic cell, electrons flow from the to the .

Which of the halogens in Table 20.1 is the strongest oxidizing agent?

The balanced half- reaction in which dichromate ion is reduced to chromium(III) ion is a Process.

The balanced half- reaction in which chlorine gas is reduced to the aqueous chloride ion is a Process.

A voltaic cell is constructed with two silver- silver chloride electrodes, where the half- reaction is The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively. The cell emf is V.

Which one of the following types of elements is most likely to be a good oxidizing agent?

In a voltaic cell electrons flow from the anode to the cathode.

How many grams of CuS are obtained by passing a current of 12 A through a solution of CuSO4 for 15 minutes ?

The potential (E) to move K+ from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is _ _.

How many seconds are required to produce 4.00 g of aluminum metal from the electrolysis of molten AlCl3 with an electrical current of 12.0 A?

How many kilowatt- hours of electricity are used to produce 3.00 kg of magnesium in the electrolysis of molten MgCl2 with an applied emf of 4.50 V?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The standard emf for the cell using the overall cell reaction below is +2.20 V: The emf generated by the cell when [Al³⁺] = 4.5 × 10^-³M and [I^-] = 0.15 M is V.

How many grams of CuS are obtained by passing a current of 12 A through a solution of CuSO₄ for 15 minutes ?

The potential (E) to move K⁺from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is _ _.

How many seconds are required to produce 4.00 g of aluminum metal from the electrolysis of molten AlCl₃with an electrical current of 12.0 A?

How many kilowatt- hours of electricity are used to produce 3.00 kg of magnesium in the electrolysis of molten MgCl₂with an applied emf of 4.50 V?