Question 1

For the following reaction, which statement AF1F1F1S1F1F1F10D is not correct?

Accepted Answer

A) Au is the reducing agent. 
B) Cl2 is the oxidizing agent. 
C) Au is oxidized. 
D) The equation is balanced. 
E) More than one statement is not correct. 
A) Au is the reducing agent. 
B) Cl2 is the oxidizing agent. 
C) Au is oxidized. 
D) The equation is balanced. 
E) More than one statement is not correct.

Question 2

The oxidation of hydrogen by oxygen is one of the most-used reactions in fuel-cell technology. The overall reaction, which is given below, has a F1F1F1S1F1F1F10GF1F1F1S1F1F1F10 value of F1F1F1S1F1F1F10474 kJ/mol. What is the standard cell potential for this fuel cell?

Accepted Answer

A) 2.46 V 
B) 4.91 V 
C) 1.23 V 
D) 3.05 V 
E) 1.50 V 
A) 2.46 V 
B) 4.91 V 
C) 1.23 V 
D) 3.05 V 
E) 1.50 V

Question 3

Which statement about corrosion is not correct?

Accepted Answer

A) Corrosion is promoted by the presence of water. 
B) Corrosion is promoted by the presence of electrolytes. 
C) Corrosion is promoted by contact between dissimilar metals. 
D) Surface oxidation protects metals such as iron, stainless steel, and aluminum from corrosion. 
E) Cathodic protection prevents corrosion of an object by attaching it to a metal that serves as the cathode of the resulting electrochemical cell. 
A) Corrosion is promoted by the presence of water. 
B) Corrosion is promoted by the presence of electrolytes. 
C) Corrosion is promoted by contact between dissimilar metals. 
D) Surface oxidation protects metals such as iron, stainless steel, and aluminum from corrosion. 
E) Cathodic protection prevents corrosion of an object by attaching it to a metal that serves as the cathode of the resulting electrochemical cell.

Question 4

What kind of chemical reaction occurs at 
(1) the anode in a voltaic cell and 
(2) the cathode?

Accepted Answer

(1) oxidation at the

Question 5

Glancing at a periodic table, where do you expect to find elements that are good oxidizing agents?

Accepted Answer

A) on the right (except for the last group) 
B) in the middle left 
C) in the top left 
D) at the bottom 
E) in the transition metals 
A) on the right (except for the last group) 
B) in the middle left 
C) in the top left 
D) at the bottom 
E) in the transition metals

Question 6

Silver tarnishes due to the formation of silver sulfide (Ag2S). Silver polish contains aluminum metal powder in an aqueous alkaline suspension. Write the balanced net ionic reaction equation to show how silver polish works to produce silver metal and solid aluminum hydroxide, Al(OH)3. Be sure to specify the states in your equation.

Accepted Answer

Question 7

When a voltaic cell reaches equilibrium, ________

Accepted Answer

A)    F1F1F1S1F1F1F10 0. 
B) Ecell F1F1F1S1F1F1F10 0. 
C) Ecell F1F1F1S1F1F1F10 K. 
D)    F1F1F1S1F1F1F10 K. 
E) Ecell F1F1F1S1F1F1F10 Q. 
A)    F1F1F1S1F1F1F10 0. 
B) Ecell F1F1F1S1F1F1F10 0. 
C) Ecell F1F1F1S1F1F1F10 K. 
D)    F1F1F1S1F1F1F10 K. 
E) Ecell F1F1F1S1F1F1F10 Q.

Question 8

Which statement about a voltaic cell is not correct?

Accepted Answer

A) The standard reduction potential is a measure of the propensity for a reduction half-reaction to occur when concentrations are 1 M, the pressure is 1 atm, and the temperature is 298 K. 
B) A reduction half-reaction with a standard reduction potential,   , when reversed becomes an oxidation half-reaction with   F1F1F1S1F1F1F10   . 
C) The standard cell potential,   , is a measure of the electromotive force (emf) generated by the cell reactions at 298 K when concentrations are 1 M and the pressure is 1 atm. 
D) The emf of a cell is a measure of the force with which the cell pumps electrons from the cathode to the anode. 
E) The cell voltage measured with a voltmeter is not necessarily the standard cell potential. 
A) The standard reduction potential is a measure of the propensity for a reduction half-reaction to occur when concentrations are 1 M, the pressure is 1 atm, and the temperature is 298 K. 
B) A reduction half-reaction with a standard reduction potential,   , when reversed becomes an oxidation half-reaction with   F1F1F1S1F1F1F10   . 
C) The standard cell potential,   , is a measure of the electromotive force (emf) generated by the cell reactions at 298 K when concentrations are 1 M and the pressure is 1 atm. 
D) The emf of a cell is a measure of the force with which the cell pumps electrons from the cathode to the anode. 
E) The cell voltage measured with a voltmeter is not necessarily the standard cell potential.

Question 9

Copper is oxidized by nitric acid. If this property were used in an electrochemical cell, what would the standard cell potential be? The relevant reduction reactions and standard reduction potentials are given below.F1F1F1S1F1F1F100.34 V   F1F1F1S1F1F1F10F1F1F1S1F1F1F100.96 V

Accepted Answer

A) (F1F1F1S1F1F1F100.62 V) 
B) (F1F1F1S1F1F1F100.62 V) 
C) (F1F1F1S1F1F1F101.30 V) 
D) (F1F1F1S1F1F1F101.30 V) 
E) (F1F1F1S1F1F1F100.68 V) 
A) (F1F1F1S1F1F1F100.62 V) 
B) (F1F1F1S1F1F1F100.62 V) 
C) (F1F1F1S1F1F1F101.30 V) 
D) (F1F1F1S1F1F1F101.30 V) 
E) (F1F1F1S1F1F1F100.68 V)

Question 10

The standard hydrogen electrode is ________

Accepted Answer

A) used to calibrate voltmeters. 
B) used to produce a set of standard reduction potentials. 
C) needed to activate electrochemical cells. 
D) often overlooked in measuring standard reduction potentials. 
E) used to produce a standard cell potential of exactly 1 V. 
A) used to calibrate voltmeters. 
B) used to produce a set of standard reduction potentials. 
C) needed to activate electrochemical cells. 
D) often overlooked in measuring standard reduction potentials. 
E) used to produce a standard cell potential of exactly 1 V.

Question 11

In a classroom demonstration of a redox reaction, Professor Smith set up a voltaic cell with a copper metal anode and a silver metal cathode. The two electrodes were in contact with solutions of the corresponding metal ions, Cu2F1F1F1S1F1F1F10 and AgF1F1F1S1F1F1F10. During the illuminating lecture on redox chemistry, the crystals of silver metal deposited on the silver electrode as the copper solution turned a darker blue. The added silver crystals had a mass of 2.68 g after 50.0 minutes of lecture. What was the average current that the cell produced?

Accepted Answer

A) 0.799 A 
B) 2.40 A 
C) 47.9 A 
D) 1.60 A 
E) 0.479 A 
A) 0.799 A 
B) 2.40 A 
C) 47.9 A 
D) 1.60 A 
E) 0.479 A

Question 12

The Energizer Bunny in the television commercial "keeps going and going." What property of the battery (voltaic cell) is being featured in this commercial?

Accepted Answer

A) the quantities of oxidizing agent and reducing agent in the battery 
B) the high voltage of the battery 
C) the low internal resistance of the battery 
D) the excellent conductivity of the battery's casing 
E) the ability of the battery to function over a wide temperature range 
A) the quantities of oxidizing agent and reducing agent in the battery 
B) the high voltage of the battery 
C) the low internal resistance of the battery 
D) the excellent conductivity of the battery's casing 
E) the ability of the battery to function over a wide temperature range

Question 13

Which statement is not correct for a voltaic cell?

Accepted Answer

A) The electron flow in the external circuit is from the negative electrode to the positive electrode. 
B) The electron flow in the external circuit is from the anode to the cathode. 
C) Electrons are transferred from the oxidizing agent to the reducing agent. 
D) Chemical energy is transformed into electrical energy by a spontaneous redox reaction. 
E) Positive ions diffuse through a porous bridge from the anode compartment to the cathode compartment. 
A) The electron flow in the external circuit is from the negative electrode to the positive electrode. 
B) The electron flow in the external circuit is from the anode to the cathode. 
C) Electrons are transferred from the oxidizing agent to the reducing agent. 
D) Chemical energy is transformed into electrical energy by a spontaneous redox reaction. 
E) Positive ions diffuse through a porous bridge from the anode compartment to the cathode compartment.

Question 14

The diagram below represents a voltaic cell. What is the balanced electrochemical reaction represented by this cell? Al(s)|Al3F1F1F1S1F1F1F10(1.0 M)||Cu2F1F1F1S1F1F1F10(1.0 M)|Cu(s)

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 15

Proteins containing a certain functional group (identified as RSH) can be titrated with triiodide ion to produce another functional group (identified as RSSR). The reaction equation is given below. What is oxidized and what is reduced in this reaction?

Accepted Answer

A) RSH is oxidized; I    
Is reduced. 
B) RSH is reduced; I is oxidized. 
C) Both RSH and I are oxidized. 
D) Both RSH and I are reduced. 
E) This reaction is not oxidationF1F1F1S1F1F1F10reduction. 
A) RSH is oxidized; I    
Is reduced. 
B) RSH is reduced; I is oxidized. 
C) Both RSH and I are oxidized. 
D) Both RSH and I are reduced. 
E) This reaction is not oxidationF1F1F1S1F1F1F10reduction.

Question 16

What is the cell potential for a cadmium/tin electrochemical cell where [Cd2F1F1F1S1F1F1F10] F1F1F1S1F1F1F10 [Sn2F1F1F1S1F1F1F10] F1F1F1S1F1F1F10 1.0 M and the temperature is 298 K? For Sn,   F1F1F1S1F1F1F10 F1F1F1S1F1F1F100.14 V and for Cd,    F1F1F1S1F1F1F10 F1F1F1S1F1F1F100.40 V.

Accepted Answer

F1F1F1S1F

Question 17

The capacity of a battery usually is specified in units of amperes F1F1F1S1F1F1F10 hours. Show that these units actually tell you the number of electrons that can be supplied by the battery.

Accepted Answer

1 A hr F1F1F1S1F1F1F10 (1 C/s)(3,600 s)

Question 18

The diagram below represents a voltaic cell. In this cell, which species is reduced? Zn(s)|Zn2F1F1F1S1F1F1F10(1.0 M)||Cu2F1F1F1S1F1F1F10(1.0 M)|Cu(s)

Accepted Answer

A) Zn(s) 
B) Zn2F1F1F1S1F1F1F10(aq) 
C) Cu2F1F1F1S1F1F1F10(aq) 
D) Cu(s) 
E) C(s) 
A) Zn(s) 
B) Zn2F1F1F1S1F1F1F10(aq) 
C) Cu2F1F1F1S1F1F1F10(aq) 
D) Cu(s) 
E) C(s)

Question 19

Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium would plate out from a solution of Cr(NO3)3 when 10 amps of current are passed through the electrolytic cell for 5.36 hours?

Accepted Answer

Question 20

An electrochemical cell is constructed with a zinc metal anode in contact with a 0.052 M solution of zinc nitrate and a silver cathode in contact with a 0.0042 M solution of silver(I) nitrate. What is the value of Q to use in the Nernst equation for this cell?

Accepted Answer

A) 2,900 
B) 12 
C) 8.1 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F102 
D) 3.4 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 
E) 1.00 
A) 2,900 
B) 12 
C) 8.1 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F102 
D) 3.4 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 
E) 1.00

For the following reaction, which statement AD is not correct?

The oxidation of hydrogen by oxygen is one of the most-used reactions in fuel-cell technology. The overall reaction, which is given below, has a G value of 474 kJ/mol. What is the standard cell potential for this fuel cell?

Which statement about corrosion is not correct?

What kind of chemical reaction occurs at (1) the anode in a voltaic cell and (2) the cathode?

Glancing at a periodic table, where do you expect to find elements that are good oxidizing agents?

When a voltaic cell reaches equilibrium, ________

Which statement about a voltaic cell is not correct?

Copper is oxidized by nitric acid. If this property were used in an electrochemical cell, what would the standard cell potential be? The relevant reduction reactions and standard reduction potentials are given below.0.34 V 0.96 V

The standard hydrogen electrode is ________

The Energizer Bunny in the television commercial "keeps going and going." What property of the battery (voltaic cell) is being featured in this commercial?

Which statement is not correct for a voltaic cell?

The diagram below represents a voltaic cell. What is the balanced electrochemical reaction represented by this cell? Al(s)|Al³^(1.0 M)||Cu²^(1.0 M)|Cu(s)

Proteins containing a certain functional group (identified as RSH) can be titrated with triiodide ion to produce another functional group (identified as RSSR). The reaction equation is given below. What is oxidized and what is reduced in this reaction?

What is the cell potential for a cadmium/tin electrochemical cell where [Cd²^]  [Sn²^]  1.0 M and the temperature is 298 K? For Sn,  0.14 V and for Cd,  0.40 V.

The capacity of a battery usually is specified in units of amperes  hours. Show that these units actually tell you the number of electrons that can be supplied by the battery.

The diagram below represents a voltaic cell. In this cell, which species is reduced? Zn(s)|Zn²^(1.0 M)||Cu²^(1.0 M)|Cu(s)

Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium would plate out from a solution of Cr(NO₃)₃ when 10 amps of current are passed through the electrolytic cell for 5.36 hours?

An electrochemical cell is constructed with a zinc metal anode in contact with a 0.052 M solution of zinc nitrate and a silver cathode in contact with a 0.0042 M solution of silver(I) nitrate. What is the value of Q to use in the Nernst equation for this cell?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

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Exam 18: Electrochemistry: The Quest for Clean Energy

For the following reaction, which statement AD is not correct?

The oxidation of hydrogen by oxygen is one of the most-used reactions in fuel-cell technology. The overall reaction, which is given below, has a G value of 474 kJ/mol. What is the standard cell potential for this fuel cell?

Which statement about corrosion is not correct?

What kind of chemical reaction occurs at (1) the anode in a voltaic cell and (2) the cathode?

Glancing at a periodic table, where do you expect to find elements that are good oxidizing agents?

When a voltaic cell reaches equilibrium, ________

Which statement about a voltaic cell is not correct?

Copper is oxidized by nitric acid. If this property were used in an electrochemical cell, what would the standard cell potential be? The relevant reduction reactions and standard reduction potentials are given below.0.34 V 0.96 V

The standard hydrogen electrode is ________

The Energizer Bunny in the television commercial "keeps going and going." What property of the battery (voltaic cell) is being featured in this commercial?

Which statement is not correct for a voltaic cell?

The diagram below represents a voltaic cell. What is the balanced electrochemical reaction represented by this cell? Al(s)|Al3(1.0 M)||Cu2(1.0 M)|Cu(s)

Proteins containing a certain functional group (identified as RSH) can be titrated with triiodide ion to produce another functional group (identified as RSSR). The reaction equation is given below. What is oxidized and what is reduced in this reaction?

What is the cell potential for a cadmium/tin electrochemical cell where [Cd2]  [Sn2]  1.0 M and the temperature is 298 K? For Sn,  0.14 V and for Cd,  0.40 V.

The capacity of a battery usually is specified in units of amperes  hours. Show that these units actually tell you the number of electrons that can be supplied by the battery.

The diagram below represents a voltaic cell. In this cell, which species is reduced? Zn(s)|Zn2(1.0 M)||Cu2(1.0 M)|Cu(s)

Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium would plate out from a solution of Cr(NO3)3 when 10 amps of current are passed through the electrolytic cell for 5.36 hours?

An electrochemical cell is constructed with a zinc metal anode in contact with a 0.052 M solution of zinc nitrate and a silver cathode in contact with a 0.0042 M solution of silver(I) nitrate. What is the value of Q to use in the Nernst equation for this cell?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

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The diagram below represents a voltaic cell. What is the balanced electrochemical reaction represented by this cell? Al(s)|Al³^(1.0 M)||Cu²^(1.0 M)|Cu(s)

What is the cell potential for a cadmium/tin electrochemical cell where [Cd²^]  [Sn²^]  1.0 M and the temperature is 298 K? For Sn,  0.14 V and for Cd,  0.40 V.

The diagram below represents a voltaic cell. In this cell, which species is reduced? Zn(s)|Zn²^(1.0 M)||Cu²^(1.0 M)|Cu(s)

Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium would plate out from a solution of Cr(NO₃)₃ when 10 amps of current are passed through the electrolytic cell for 5.36 hours?