Question 1

The lead-containing reactant(s)consumed during recharging of a lead-acid battery is/are ________.

Accepted Answer

A) Pb (s)only 
B) PbO2 (s)only 
C) PbSO4 (s)only 
D) both Pb   (s)and PbSO4 (s) 
E) both Pb (s)and PbO2 (s) 
A) Pb (s)only 
B) PbO2 (s)only 
C) PbSO4 (s)only 
D) both Pb   (s)and PbSO4 (s) 
E) both Pb (s)and PbO2 (s)

Question 2

Which element is oxidized in the following reaction?
Cr2O72- + 6S2O32- + 14H+ → 2Cr3+ + 3S4O62- + 7H2O

Accepted Answer

A) S4O62- 
B) Cr 
C) H 
D) O 
E) S 
A) S4O62- 
B) Cr 
C) H 
D) O 
E) S

Question 3

Which one of the following reactions is a redox reaction?

Accepted Answer

A) NaOH + HCl → NaCl + H2O 
B) Pb2+ + 2Cl- → PbCl2 
C) AgNO3 + HCl → HNO3 + AgCl 
D) None of the above is a redox reaction. 
A) NaOH + HCl → NaCl + H2O 
B) Pb2+ + 2Cl- → PbCl2 
C) AgNO3 + HCl → HNO3 + AgCl 
D) None of the above is a redox reaction.

Question 4

Which element is oxidized in the reaction below?
Fe2+ + H+ + Cr2O72- → Fe3+ + Cr3+ + H2O

Accepted Answer

A) Cr 
B) O 
C) H 
D) Fe 
A) Cr 
B) O 
C) H 
D) Fe

Question 5

Galvanized iron is iron coated with ________.

Accepted Answer

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

Question 6

How many seconds are required to produce 5.00 g of aluminum metal from the electrolysis of molten   with an electrical current of 15.0 A?

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

The standard reduction potential of X is 1.23 V and that of Y is -0.44 V; therefore X is oxidized by Y.

Accepted Answer

A) True 
 B)False

Question 9

The reduction half reaction occurring in the standard hydrogen electrode is ________.

Accepted Answer

A) H2 (g, 1 atm)→ 2H+ (aq, 1M)+ 2e- 
B) 2H+ (aq)+ 2O   → H2O (l) 
C) O2 (g)+ 4H+ (aq)+ 4e- → 2H2O (l) 
D) 2H+ (aq, 1M)+ 2e- → H2 (g, 1 atm) 
E) 2H+ (aq, 1M)+ Cl2 (aq)→ 2HCl (aq) 
A) H2 (g, 1 atm)→ 2H+ (aq, 1M)+ 2e- 
B) 2H+ (aq)+ 2O   → H2O (l) 
C) O2 (g)+ 4H+ (aq)+ 4e- → 2H2O (l) 
D) 2H+ (aq, 1M)+ 2e- → H2 (g, 1 atm) 
E) 2H+ (aq, 1M)+ Cl2 (aq)→ 2HCl (aq)

Question 10

How many minutes will it take to plate out 2.19 g of chromium metal from a solution of   using a current of 19.5 amps in an electrolytic cell?

Accepted Answer

A) 10.4 
B) 625 
C) 208 
D) 3.47 
E) 31.2 
A) 10.4 
B) 625 
C) 208 
D) 3.47 
E) 31.2

Question 11

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)+   (s)→   (aq)+   (aq)
The emf generated by the cell when [   ] = 3.5 ×   M and [   ] = 0.30 M is

Accepted Answer

A) 2.20 
B) 2.28 
C) 2.12 
D) 2.36 
E) 2.23 
A) 2.20 
B) 2.28 
C) 2.12 
D) 2.36 
E) 2.23

Question 12

The electrode where reduction occurs is called the anode.

Accepted Answer

A) True 
 B)False

Question 13

Which element is oxidized in the reaction below?
I- + MnO4- + H+ → I2 + MnO2 + H2O

Accepted Answer

A) H 
B) I 
C) O 
D) Mn 
A) H 
B) I 
C) O 
D) Mn

Question 14

Which element is reduced in the following reaction?     + 12HN   → 2Fe(N     + 3S + 6N   + 6H2O

Accepted Answer

A) N 
B) S 
C) H 
D) O 
E)    
A) N 
B) S 
C) H 
D) O 
E)

Question 15

The balanced half-reaction in which ethanol,CH3CH2OH,is oxidized to ethanoic acid,CH3COOH. is a ________ process.

Accepted Answer

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

Question 16

The standard cell potential (E°cell)of the reaction below is -0.55 V.The value of   for the reaction is ________ J/mol. I2 (s)+ 2Br- (aq)→ 2I- (aq)+ Br2 (l)

Accepted Answer

A) 0.54 
B) 0.55 
C) 5.5 × 10-6 
D) 1.1 × 105 
E) none of the above 
A) 0.54 
B) 0.55 
C) 5.5 × 10-6 
D) 1.1 × 105 
E) none of the above

Question 17

Which element is oxidized in the reaction below?
Fe(CO)5 (l)+ 2HI (g)→ Fe(CO)4I2 (s)+ CO (g)+ H2 (g)

Accepted Answer

A) C 
B) O 
C) H 
D) Fe 
E) I 
A) C 
B) O 
C) H 
D) Fe 
E) I

Question 18

In a half reaction,the amount of a substance that is reduced or oxidized is directly proportional to the number of electrons generated in the cell.

Accepted Answer

A) True 
 B)False

Question 19

Which one of the following is the best oxidizing agent?

Accepted Answer

A) H2 
B) Na 
C) O2 
D) Li 
E) Ca 
A) H2 
B) Na 
C) O2 
D) Li 
E) Ca

Question 20

Which substance is the oxidizing agent in the reaction below?
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Accepted Answer

A) Pb 
B) PbSO4 
C) H2SO4 
D) PbO2 
E) H2O 
A) Pb 
B) PbSO4 
C) H2SO4 
D) PbO2 
E) H2O

Exam 20: Electrochemistry

The lead-containing reactant(s)consumed during recharging of a lead-acid battery is/are ________.

Which element is oxidized in the following reaction? Cr2O72- + 6S2O32- + 14H+ → 2Cr3+ + 3S4O62- + 7H2O

Which one of the following reactions is a redox reaction?

Which element is oxidized in the reaction below? Fe2+ + H+ + Cr2O72- → Fe3+ + Cr3+ + H2O

Galvanized iron is iron coated with ________.

How many seconds are required to produce 5.00 g of aluminum metal from the electrolysis of molten with an electrical current of 15.0 A?

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

The standard reduction potential of X is 1.23 V and that of Y is -0.44 V; therefore X is oxidized by Y.

The reduction half reaction occurring in the standard hydrogen electrode is ________.

How many minutes will it take to plate out 2.19 g of chromium metal from a solution of using a current of 19.5 amps in an electrolytic cell?

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)+ (s)→ (aq)+ (aq) The emf generated by the cell when [ ] = 3.5 × M and [ ] = 0.30 M is

The electrode where reduction occurs is called the anode.

Which element is oxidized in the reaction below? I- + MnO4- + H+ → I2 + MnO2 + H2O

Which element is reduced in the following reaction? + 12HN → 2Fe(N + 3S + 6N + 6H2O

The balanced half-reaction in which ethanol,CH3CH2OH,is oxidized to ethanoic acid,CH3COOH. is a ________ process.

The standard cell potential (E°cell)of the reaction below is -0.55 V.The value of for the reaction is ________ J/mol. I2 (s)+ 2Br- (aq)→ 2I- (aq)+ Br2 (l)

Which element is oxidized in the reaction below? Fe(CO)5 (l)+ 2HI (g)→ Fe(CO)4I2 (s)+ CO (g)+ H2 (g)

In a half reaction,the amount of a substance that is reduced or oxidized is directly proportional to the number of electrons generated in the cell.

Which one of the following is the best oxidizing agent?

Which substance is the oxidizing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Which element is oxidized in the following reaction? Cr₂O₇^2- + 6S₂O₃^2- + 14H⁺ → 2Cr³⁺ + 3S₄O₆^2- + 7H₂O

Which element is oxidized in the reaction below? Fe²⁺ + H⁺ + Cr₂O₇^2- → Fe³⁺ + Cr³⁺ + H₂O

Which element is oxidized in the reaction below? I^- + MnO₄^- + H⁺ → I₂ + MnO₂ + H₂O

Which element is reduced in the following reaction? + 12HN → 2Fe(N + 3S + 6N + 6H₂O

The balanced half-reaction in which ethanol,CH₃CH₂OH,is oxidized to ethanoic acid,CH₃COOH. is a ________ process.

The standard cell potential (E°_cell)of the reaction below is -0.55 V.The value of for the reaction is ________ J/mol. I₂ (s)+ 2Br^- (aq)→ 2I^- (aq)+ Br₂ (l)

Which element is oxidized in the reaction below? Fe(CO)₅ (l)+ 2HI (g)→ Fe(CO)₄I₂ (s)+ CO (g)+ H₂ (g)

Which substance is the oxidizing agent in the reaction below? Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O