Question 1

The ________ of the alkaline battery is powdered zinc in a gel that contacts potassium hydroxide.

Accepted Answer

The answer of The ________ of the alkaline battery is...

Question 2

What is the oxidation number of manganese in MnO2?

Accepted Answer

A) +3 
B) +2 
C) +1 
D) +4 
E) +7 
A) +3 
B) +2 
C) +1 
D) +4 
E) +7

Question 3

________ electrons appear in the following half-reaction when it is balanced. S4O62- → 2S2O32-

Accepted Answer

A) 6 
B) 2 
C) 4 
D) 1 
E) 3 
A) 6 
B) 2 
C) 4 
D) 1 
E) 3

Question 4

The standard reduction potential,E°red,is proportional to the stoichiometric coefficient.

Accepted Answer

A) True 
 B)False

Question 5

________ is the oxidizing agent in the reaction below. Na(s)+ 2Cl2(g)→ 2NaCl(s)

Accepted Answer

A) Na+ 
B) Cl- 
C) Na 
D) NaCl 
E) Cl2 
A) Na+ 
B) Cl- 
C) Na 
D) NaCl 
E) Cl2

Question 6

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by ________.

Accepted Answer

A) ΔG =   
B) ΔG =   
C) ΔG = -nFE 
D) ΔG = -nRTF 
E) ΔG =   
A) ΔG =   
B) ΔG =   
C) ΔG = -nFE 
D) ΔG = -nRTF 
E) ΔG =

Question 7

The balanced half-reaction in which dichromate ion is reduced to chromium metal is a ________ process.

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

How many grams of Ca metal are produced by the electrolysis of molten Ca   using a current of 30.0 amp for 8.0 hours?

Accepted Answer

A) 17.9 
B) 359 
C) 0.0622 
D) 179 
E) 89.7 
A) 17.9 
B) 359 
C) 0.0622 
D) 179 
E) 89.7

Question 10

The amount of a substance that is reduced or oxidized is inversely proportional to the number of electrons produced in a cells half reaction.

Accepted Answer

A) True 
 B)False

Question 11

Consider an electrochemical cell based on the reaction: 2H+ (aq)+ Sn (s)→ Sn2+ (aq)+ H2 (g)
Which of the following actions would change the measured cell potential?

Accepted Answer

A) increasing the pH in the cathode compartment 
B) lowering the pH in the cathode compartment 
C) increasing the [Sn2+] in the anode compartment 
D) increasing the pressure of hydrogen gas in the cathode compartment 
E) Any of the above will change the measure cell potential. 
A) increasing the pH in the cathode compartment 
B) lowering the pH in the cathode compartment 
C) increasing the [Sn2+] in the anode compartment 
D) increasing the pressure of hydrogen gas in the cathode compartment 
E) Any of the above will change the measure cell potential.

Question 12

What is the coefficient of the dichromate ion when the following equation is balanced?
Fe2+ + Cr2O72- → Fe3+ + Cr3+ (acidic solution)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) 6 
A) 1 
B) 2 
C) 3 
D) 5 
E) 6

Question 13

Which substance is serving as the oxidizing agent in the following reaction?
CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(g)

Accepted Answer

A) H2O 
B) CH4 
C) O2 
D) CO2 
E) The reaction above is not a redox reaction 
A) H2O 
B) CH4 
C) O2 
D) CO2 
E) The reaction above is not a redox reaction

Question 14

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

Accepted Answer

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

Question 15

The most useful ore of aluminum is bauxite,in which Al is present as hydrated oxides,   The number of kilowatt-hours of electricity required to produce   of aluminum from electrolysis of compounds from bauxite is ________ when the applied emf is

Accepted Answer

A) 0.0249 
B) 0.0402 
C) 26.8 
D) 13.4 
E) 40.2 
A) 0.0249 
B) 0.0402 
C) 26.8 
D) 13.4 
E) 40.2

Question 16

In the formula ΔG = -nFE,n is the ________.

Accepted Answer

number of

Question 17

The electrolysis of molten   for 2.50 hr with an electrical current of 12.0 A produces   of aluminum metal.

Accepted Answer

A) 90.7 
B) 0.373 
C) 2.80 ×   
D) 10.1 
E) 30.2 
A) 90.7 
B) 0.373 
C) 2.80 ×   
D) 10.1 
E) 30.2

Question 18

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

Accepted Answer

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

Question 19

Define a coulomb.

Accepted Answer

the quantity of char

Question 20

The standard cell potential (E°cell)for the voltaic cell based on the reaction below is ________ V. Sn2+ (aq)+ 2Fe3+ (aq)→ 2Fe2+ (aq)+ Sn4+ (aq)

Accepted Answer

A) +0.46 
B) +0.617 
C) +1.39 
D) -0.46 
E) +1.21 
A) +0.46 
B) +0.617 
C) +1.39 
D) -0.46 
E) +1.21

Exam 20: Electrochemistry

The ________ of the alkaline battery is powdered zinc in a gel that contacts potassium hydroxide.

What is the oxidation number of manganese in MnO2?

________ electrons appear in the following half-reaction when it is balanced. S4O62- → 2S2O32-

The standard reduction potential,E°red,is proportional to the stoichiometric coefficient.

________ is the oxidizing agent in the reaction below. Na(s)+ 2Cl2(g)→ 2NaCl(s)

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by ________.

The balanced half-reaction in which dichromate ion is reduced to chromium metal is a ________ process.

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

How many grams of Ca metal are produced by the electrolysis of molten Ca using a current of 30.0 amp for 8.0 hours?

The amount of a substance that is reduced or oxidized is inversely proportional to the number of electrons produced in a cells half reaction.

Consider an electrochemical cell based on the reaction: 2H+ (aq)+ Sn (s)→ Sn2+ (aq)+ H2 (g) Which of the following actions would change the measured cell potential?

What is the coefficient of the dichromate ion when the following equation is balanced? Fe2+ + Cr2O72- → Fe3+ + Cr3+ (acidic solution)

Which substance is serving as the oxidizing agent in the following reaction? CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(g)

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

The most useful ore of aluminum is bauxite,in which Al is present as hydrated oxides, The number of kilowatt-hours of electricity required to produce of aluminum from electrolysis of compounds from bauxite is ________ when the applied emf is

In the formula ΔG = -nFE,n is the ________.

The electrolysis of molten for 2.50 hr with an electrical current of 12.0 A produces of aluminum metal.

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

Define a coulomb.

The standard cell potential (E°cell)for the voltaic cell based on the reaction below is ________ V. Sn2+ (aq)+ 2Fe3+ (aq)→ 2Fe2+ (aq)+ Sn4+ (aq)

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

What is the oxidation number of manganese in MnO₂?

________ electrons appear in the following half-reaction when it is balanced. S₄O₆^2- → 2S₂O₃^2-

The standard reduction potential,E°_red,is proportional to the stoichiometric coefficient.

________ is the oxidizing agent in the reaction below. Na(s)+ 2Cl₂(g)→ 2NaCl(s)

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

Consider an electrochemical cell based on the reaction: 2H⁺ (aq)+ Sn (s)→ Sn²⁺ (aq)+ H₂ (g) Which of the following actions would change the measured cell potential?

What is the coefficient of the dichromate ion when the following equation is balanced? Fe²⁺ + Cr₂O₇^2- → Fe³⁺ + Cr³⁺ (acidic solution)

Which substance is serving as the oxidizing agent in the following reaction? CH₄(g)+ 2O₂(g)→ CO₂(g)+ 2H₂O(g)

The standard cell potential (E°_cell)for the voltaic cell based on the reaction below is ________ V. Sn²⁺ (aq)+ 2Fe³⁺ (aq)→ 2Fe²⁺ (aq)+ Sn⁴⁺ (aq)