Question 1

A piece of iron half-immersed in a sodium chloride solution will corrode more rapidly than a piece of iron half-immersed in pure water,because

Accepted Answer

A)  the ions,which are not present in pure water,balance the accumulation of charge in each of the half-cells.
B)  the chloride ions increase the pH of the solution.
C)  the sodium ions oxidize the iron atoms.
D)  the chloride ions form a precipitate with iron.
E)  the chloride ions oxidize the iron atoms.F) A) and D)
G) A) and C)

Question 2

Given:
Li+(aq) + e- +(aq) + e-  Li(s) ; E° = -3.04 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e-  Fe(s) ; E° = -0.41 V Ag+(aq) + e-  Ag(s) ; E° = 0.80 V Br2(l) + 2e-  2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent? A) Mg2+ B) Br- C) Fe2+ D) Li E) Ag+" class="answers-bank-image d-inline" rel="preload" >Li(s) ; E° = -3.04 V
Mg2+(aq) + 2e- +(aq) + e-  Li(s) ; E° = -3.04 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e-  Fe(s) ; E° = -0.41 V Ag+(aq) + e-  Ag(s) ; E° = 0.80 V Br2(l) + 2e-  2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent? A) Mg2+ B) Br- C) Fe2+ D) Li E) Ag+" class="answers-bank-image d-inline" rel="preload" >Mg(s) ; E° = -2.38 V
Fe2+(aq) + 2e- +(aq) + e-  Li(s) ; E° = -3.04 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e-  Fe(s) ; E° = -0.41 V Ag+(aq) + e-  Ag(s) ; E° = 0.80 V Br2(l) + 2e-  2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent? A) Mg2+ B) Br- C) Fe2+ D) Li E) Ag+" class="answers-bank-image d-inline" rel="preload" >Fe(s) ; E° = -0.41 V
Ag+(aq) + e- +(aq) + e-  Li(s) ; E° = -3.04 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e-  Fe(s) ; E° = -0.41 V Ag+(aq) + e-  Ag(s) ; E° = 0.80 V Br2(l) + 2e-  2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent? A) Mg2+ B) Br- C) Fe2+ D) Li E) Ag+" class="answers-bank-image d-inline" rel="preload" >Ag(s) ; E° = 0.80 V
Br2(l) + 2e- +(aq) + e-  Li(s) ; E° = -3.04 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e-  Fe(s) ; E° = -0.41 V Ag+(aq) + e-  Ag(s) ; E° = 0.80 V Br2(l) + 2e-  2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent? A) Mg2+ B) Br- C) Fe2+ D) Li E) Ag+" class="answers-bank-image d-inline" rel="preload" >2Br-(aq) ; E° = 1.07 V
Which of the following species is the best oxidizing agent?

Accepted Answer

A)  Mg2+
B)  Br-
C)  Fe2+
D)  Li
E)  Ag+F) B) and E)
G) B) and C)

Question 3

A voltaic cell is made by placing an iron electrode in a compartment in which the Fe2+ concentration is 3.0 × 10-5 M and by placing a Pt electrode in the other compartment,in which the H+ concentration is 3.10 M and 2+ concentration is 3.0 × 10-5 M and by placing a Pt electrode in the other compartment,in which the H+ concentration is 3.10 M and   = 1.00 atm.The Fe2+/Fe half-cell reduction potential is -0.41 V,and the H+/H2 half-cell reduction potential is 0.00 V.What is E for the cell at 25oC? A) 0.10 V B) 0.57 V C) 0.27 V D) 0.25 V E) 0.56 V" class="answers-bank-image d-inline" rel="preload" > = 1.00 atm.The Fe2+/Fe half-cell reduction potential is -0.41 V,and the H+/H2 half-cell reduction potential is 0.00 V.What is E for the cell at 25oC?

Accepted Answer

A)  0.10 V
B)  0.57 V
C)  0.27 V
D)  0.25 V
E)  0.56 VF) C) and D)
G) A) and C)

Question 4

The cell potential of an electrochemical cell with the cell reaction
2Al(s) + 3Zn2+(aq) → 3Zn(s) + 2Al3+(aq) 
Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed?

Accepted Answer

A)   2+(aq) → 3Zn(s) + 2Al3+(aq)  Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed? 
A)     J 
B)     J 
C)     J 
D)     J 
E)     J" class="answers-bank-image d-inline" rel="preload" > J
B)   2+(aq) → 3Zn(s) + 2Al3+(aq)  Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed? 
A)     J 
B)     J 
C)     J 
D)     J 
E)     J" class="answers-bank-image d-inline" rel="preload" > J
C)   2+(aq) → 3Zn(s) + 2Al3+(aq)  Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed? 
A)     J 
B)     J 
C)     J 
D)     J 
E)     J" class="answers-bank-image d-inline" rel="preload" > J
D)   2+(aq) → 3Zn(s) + 2Al3+(aq)  Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed? 
A)     J 
B)     J 
C)     J 
D)     J 
E)     J" class="answers-bank-image d-inline" rel="preload" > J
E)   2+(aq) → 3Zn(s) + 2Al3+(aq)  Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed? 
A)     J 
B)     J 
C)     J 
D)     J 
E)     J" class="answers-bank-image d-inline" rel="preload" > JF) A) and E)
G) C) and D)

Question 5

A fuel cell designed to react grain alcohol with oxygen has the following net reaction:
C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) 
The maximum work that 1 mol of alcohol can yield by this process is 1320 kJ.What is the theoretical maximum voltage that this cell can achieve?

Accepted Answer

A)  1.14 V
B)  2.28 V
C)  2.01 V
D)  0.760 V
E)  13.7 VF) A) and B)
G) A) and C) A

Question 6

Balance the following half-reaction occurring in acidic solution.
​
NO3-(aq) → 3-(aq) →   A) NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  B) NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  C) NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− D) NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  E) NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  NO3-(aq) + 10H+(aq) + 8e− → 3-(aq) →   
A)  NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  
B)  NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  
C)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− 
D)  NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  
E)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" > + 3H2O(l) 
B)  NO3-(aq) + 3H2O(l) + 10e− → 3-(aq) →   
A)  NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  
B)  NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  
C)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− 
D)  NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  
E)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" > + 10H+(aq) 
C)  NO3-(aq) + 10H+(aq) → 3-(aq) →   
A)  NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  
B)  NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  
C)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− 
D)  NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  
E)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" > + 3H2O(l) + 10e−
D)  NO3-(aq) + 8e− → 3-(aq) →   
A)  NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  
B)  NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  
C)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− 
D)  NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  
E)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" > + 8H+(aq) + 3H2O(l) 
E)  NO3-(aq) + 10H+(aq) → 3-(aq) →   
A)  NO3-(aq) + 10H+(aq) + 8e− →   + 3H2O(l)  
B)  NO3-(aq) + 3H2O(l) + 10e− →   + 10H+(aq)  
C)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) + 10e− 
D)  NO3-(aq) + 8e− →   + 8H+(aq) + 3H2O(l)  
E)  NO3-(aq) + 10H+(aq) →   + 3H2O(l) " class="answers-bank-image d-inline" rel="preload" > + 3H2O(l) F) D) and E)
G) A) and B) A

Question 7

Given:
Zn2+(aq) + 2e- 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-  2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent? A) Zn B) Cr3+ C) Cr2O72- D) Zn2+ E) Cu" class="answers-bank-image d-inline" rel="preload" >Zn(s) ; E° = -0.76 V
Cu2+(aq) + 2e- 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-  2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent? A) Zn B) Cr3+ C) Cr2O72- D) Zn2+ E) Cu" class="answers-bank-image d-inline" rel="preload" >Cu(s) ; E° = 0.34 V
Cr2O72-(aq) + 14H+(aq) + 6e- 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-  2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent? A) Zn B) Cr3+ C) Cr2O72- D) Zn2+ E) Cu" class="answers-bank-image d-inline" rel="preload" >2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V
Which of the following species is the strongest oxidizing agent?

Accepted Answer

A)  Zn
B)  Cr3+
C)  Cr2O72-
D)  Zn2+
E)  CuF) All of the above
G) A) and D)

Question 8

An alkaline dry cell is similar to Leclanché cell,but it has _____ in place of ammonium chloride.

Accepted Answer

A)  ​potassium hydroxide
B)  ​sodium hydroxide
C)  ​silver hydroxide
D)  ​lead (II) hydroxide
E)  ​iron (II) hydroxideF) B) and C)
G) A) and D)

Question 9

A voltaic cell is made by placing an iron electrode in a compartment in which the Fe2+ concentration is 2.0 × 10-5 M and by placing a Pt electrode in the other compartment,in which the H+ concentration is 3.4 M and 2+ concentration is 2.0 × 10-5 M and by placing a Pt electrode in the other compartment,in which the H+ concentration is 3.4 M and   = 1.00 atm.The Fe2+/Fe half-cell reduction potential is -0.41 V,and the H+/H2 half-cell reduction potential is 0.00 V.What is the value of E° for this cell,and which electrode is the anode? A) 0.41 V,Fe B) 0.90 V,Pt C) -0.41 V,Pt D) -0.41 V,Fe E) 0.41 V,Pt" class="answers-bank-image d-inline" rel="preload" > = 1.00 atm.The Fe2+/Fe half-cell reduction potential is -0.41 V,and the H+/H2 half-cell reduction potential is 0.00 V.What is the value of E° for this cell,and which electrode is the anode?

Accepted Answer

A)  0.41 V,Fe
B)  0.90 V,Pt
C)  -0.41 V,Pt
D)  -0.41 V,Fe
E)  0.41 V,PtF) B) and C)
G) C) and E)

Question 10

For a galvanic cell using Fe | Fe2+(1.0 M) and Pb | Pb2+(1.0 M) half-cells,which of the following statements is correct?
Fe2+(aq) + 2e- → Fe(s) ; E° = -0.41 V
Pb2+(aq) + 2e- → Pb(s) ; E° = -0.13 V

Accepted Answer

A)  The iron electrode is the cathode.
B)  When the cell has completely discharged,the concentration of Pb2+ is zero.
C)  The mass of the iron electrode increases during discharge.
D)  The concentration of Pb2+ decreases during discharge.
E)  Electrons leave the lead electrode to pass through the external circuit during discharge.F) B) and D)
G) C) and E)

Question 11

The _____ has zinc can as the anode; a graphite rod in the center,surrounded by a paste of manganese dioxide,ammonium and zinc chlorides,and carbon black,is the cathode.

Accepted Answer

A)  Poggendorff acid cell​
B)  Bunsen cell​
C)  Leclanché dry cell​
D)  Daniell cell​
E)  ​Weston cellF) A) and B)
G) A) and C)

Question 12

What is the cell reaction for the following electrochemical cell?
Zn | Zn2+(aq) || Sc3+(aq) | Sc

Accepted Answer

A)  3Zn(s) + 2Sc3+(aq) → 2Sc(s) + 3Zn2+(aq) 
B)  2Sc(s) + 3Zn2+(aq) → 3Zn(s) + 2Sc3+(aq) 
C)  Zn(s) + Zn2+(aq) → Sc(s) + Sc3+(aq) 
D)  Zn(s) + Sc3+(aq) → Sc(s) + Zn2+(aq) 
E)  Sc(s) + Zn2+(aq) → Zn(s) + Sc3+(aq) F) C) and E)
G) A) and D)

Question 13

Given:
W3+(aq) + 3e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >W(s) ; E° = 2.72 V
Pb2+(aq) + 2e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Pb(s) ; E° = -0.13 V
Ni2+(aq) + 2e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Ni(s) ; E° = -0.23 V
Cd2+(aq) + 2e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Cd(s) ; E° = -0.40 V
Zn2+(aq) + 2e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Zn(s) ; E° = -0.76 V
Al3+(aq) + 3e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Al(s) ; E° = -1.66 V
Mg2+(aq) + 2e- 3+(aq) + 3e-  W(s) ; E° = 2.72 V Pb2+(aq) + 2e-  Pb(s) ; E° = -0.13 V Ni2+(aq) + 2e-  Ni(s) ; E° = -0.23 V Cd2+(aq) + 2e-  Cd(s) ; E° = -0.40 V Zn2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Al3+(aq) + 3e-  Al(s) ; E° = -1.66 V Mg2+(aq) + 2e-  Mg(s) ; E° = -2.38 V Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni? A) Cd B) Pb C) Al D) Zn E) Mg" class="answers-bank-image d-inline" rel="preload" >Mg(s) ; E° = -2.38 V
Under standard-state conditions,which of the following metals will reduce W3+ to W but will not reduce Ni2+ to Ni?

Accepted Answer

A)  Cd
B)  Pb
C)  Al
D)  Zn
E)  MgF) A) and B)
G) B) and C)

Question 14

The process of producing a chemical change in an electrolytic cell is called _____.

Accepted Answer

A)  ​electrodialysis
B)  ​electrophoresis
C)  ​electroplating
D)  ​electrodeposition
E)  ​electrolysisF) B) and D)
G) B) and E)

Question 15

Given:
Mn2+(aq) + 2e- 2+(aq) + 2e-   Mn(s) ; E° = -1.18 V Cu2+(aq) + 2e-   Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-   2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent? A) Mn B) Cu C) Cr3+ D) Mn2+ E) Cr2O72-" class="answers-bank-image d-inline" rel="preload" >
Mn(s) ; E° = -1.18 V
Cu2+(aq) + 2e- 2+(aq) + 2e-   Mn(s) ; E° = -1.18 V Cu2+(aq) + 2e-   Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-   2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent? A) Mn B) Cu C) Cr3+ D) Mn2+ E) Cr2O72-" class="answers-bank-image d-inline" rel="preload" >
Cu(s) ; E° = 0.34 V
Cr2O72-(aq) + 14H+(aq) + 6e- 2+(aq) + 2e-   Mn(s) ; E° = -1.18 V Cu2+(aq) + 2e-   Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e-   2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent? A) Mn B) Cu C) Cr3+ D) Mn2+ E) Cr2O72-" class="answers-bank-image d-inline" rel="preload" >
2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V
Which of the following species is the strongest reducing agent?

Accepted Answer

A)  Mn
B)  Cu
C)  Cr3+
D)  Mn2+
E)  Cr2O72-F) B) and D)
G) A) and D)

Question 16

If the cell is initially at standard-state conditions,which of the following statements is true? 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V A) Initially Kc = 2 × 10-37,and it decreases with time. B) Initially Kc = 2 × 1037,and it does not change with time. C) Initially Kc = 2 × 1037,and it decreases with time. D) Initially Kc = 2 × 1037,and it increases with time. E) Initially Kc = 2 × 10-37,and it increases with time." class="answers-bank-image d-inline" rel="preload" > Zn2+(aq) + 2e- 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V A) Initially Kc = 2 × 10-37,and it decreases with time. B) Initially Kc = 2 × 1037,and it does not change with time. C) Initially Kc = 2 × 1037,and it decreases with time. D) Initially Kc = 2 × 1037,and it increases with time. E) Initially Kc = 2 × 10-37,and it increases with time." class="answers-bank-image d-inline" rel="preload" >Zn(s) ; E° = -0.76 V
Cu2+(aq) + 2e- 2+(aq) + 2e-  Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e-  Cu(s) ; E° = 0.34 V A) Initially Kc = 2 × 10-37,and it decreases with time. B) Initially Kc = 2 × 1037,and it does not change with time. C) Initially Kc = 2 × 1037,and it decreases with time. D) Initially Kc = 2 × 1037,and it increases with time. E) Initially Kc = 2 × 10-37,and it increases with time." class="answers-bank-image d-inline" rel="preload" >Cu(s) ; E° = 0.34 V

Accepted Answer

A)  Initially Kc = 2 × 10-37,and it decreases with time.
B)  Initially Kc = 2 × 1037,and it does not change with time.
C)  Initially Kc = 2 × 1037,and it decreases with time.
D)  Initially Kc = 2 × 1037,and it increases with time.
E)  Initially Kc = 2 × 10-37,and it increases with time.F) A) and D)
G) A) and B)

Question 17

What is one of the major products in the electrolysis of a saturated aqueous sodium chloride solution?
Reduction Half-Reaction
E° (V) 
Na+(aq) + e- +(aq) + e-  Na(s)  -2.71 Mg2+(aq) + 2e-   Mg(s)  -2.37 2H2O(l) + 2e-  H2(g) + 2OH-(aq)  -0.83 O2(g) + 4H+(aq) + 4e-  2H2O(l) 1.23 Cl2(g) + 2e-  2Cl-(aq)  1.36 A) Mg B) O2 C) H2O D) Na E) Cl2" class="answers-bank-image d-inline" rel="preload" >Na(s)  -2.71
Mg2+(aq) + 2e- +(aq) + e-  Na(s)  -2.71 Mg2+(aq) + 2e-   Mg(s)  -2.37 2H2O(l) + 2e-  H2(g) + 2OH-(aq)  -0.83 O2(g) + 4H+(aq) + 4e-  2H2O(l) 1.23 Cl2(g) + 2e-  2Cl-(aq)  1.36 A) Mg B) O2 C) H2O D) Na E) Cl2" class="answers-bank-image d-inline" rel="preload" > Mg(s)  -2.37
2H2O(l) + 2e- +(aq) + e-  Na(s)  -2.71 Mg2+(aq) + 2e-   Mg(s)  -2.37 2H2O(l) + 2e-  H2(g) + 2OH-(aq)  -0.83 O2(g) + 4H+(aq) + 4e-  2H2O(l) 1.23 Cl2(g) + 2e-  2Cl-(aq)  1.36 A) Mg B) O2 C) H2O D) Na E) Cl2" class="answers-bank-image d-inline" rel="preload" >H2(g) + 2OH-(aq)  -0.83
O2(g) + 4H+(aq) + 4e- +(aq) + e-  Na(s)  -2.71 Mg2+(aq) + 2e-   Mg(s)  -2.37 2H2O(l) + 2e-  H2(g) + 2OH-(aq)  -0.83 O2(g) + 4H+(aq) + 4e-  2H2O(l) 1.23 Cl2(g) + 2e-  2Cl-(aq)  1.36 A) Mg B) O2 C) H2O D) Na E) Cl2" class="answers-bank-image d-inline" rel="preload" >2H2O(l) 1.23
Cl2(g) + 2e- +(aq) + e-  Na(s)  -2.71 Mg2+(aq) + 2e-   Mg(s)  -2.37 2H2O(l) + 2e-  H2(g) + 2OH-(aq)  -0.83 O2(g) + 4H+(aq) + 4e-  2H2O(l) 1.23 Cl2(g) + 2e-  2Cl-(aq)  1.36 A) Mg B) O2 C) H2O D) Na E) Cl2" class="answers-bank-image d-inline" rel="preload" >2Cl-(aq) 
1.36

Accepted Answer

A)  Mg
B)  O2
C)  H2O
D)  Na
E)  Cl2F) B) and E)
G) A) and E)

Question 18

What is the cell reaction for the following voltaic cell?
Cr(s) | Cr3+(aq) || Br-(aq) | Br2(g) | Pt(s)

Accepted Answer

A)  2Cr(s) + 3Br2(g)  3+(aq) || Br-(aq) | Br2(g) | Pt(s)  
A)  2Cr(s) + 3Br2(g)    2Cr3+(aq) + 6Br-(aq)  
B)  Cr(s) + Cr3+(aq)    Br-(aq) + Br2(g)  
C)  2Cr3+(aq) + 6Br-(aq)    2Cr(s) + 3Br2(g)  
D)  Cr(s) + 3Br2(g)    Cr3+(s) + 2Br-(aq)  
E)  Cr(s) + 2Br-(aq)    Br2(g) + Cr3+(aq) " class="answers-bank-image d-inline" rel="preload" > 2Cr3+(aq) + 6Br-(aq) 
B)  Cr(s) + Cr3+(aq)  3+(aq) || Br-(aq) | Br2(g) | Pt(s)  
A)  2Cr(s) + 3Br2(g)    2Cr3+(aq) + 6Br-(aq)  
B)  Cr(s) + Cr3+(aq)    Br-(aq) + Br2(g)  
C)  2Cr3+(aq) + 6Br-(aq)    2Cr(s) + 3Br2(g)  
D)  Cr(s) + 3Br2(g)    Cr3+(s) + 2Br-(aq)  
E)  Cr(s) + 2Br-(aq)    Br2(g) + Cr3+(aq) " class="answers-bank-image d-inline" rel="preload" > Br-(aq) + Br2(g) 
C)  2Cr3+(aq) + 6Br-(aq)  3+(aq) || Br-(aq) | Br2(g) | Pt(s)  
A)  2Cr(s) + 3Br2(g)    2Cr3+(aq) + 6Br-(aq)  
B)  Cr(s) + Cr3+(aq)    Br-(aq) + Br2(g)  
C)  2Cr3+(aq) + 6Br-(aq)    2Cr(s) + 3Br2(g)  
D)  Cr(s) + 3Br2(g)    Cr3+(s) + 2Br-(aq)  
E)  Cr(s) + 2Br-(aq)    Br2(g) + Cr3+(aq) " class="answers-bank-image d-inline" rel="preload" > 2Cr(s) + 3Br2(g) 
D)  Cr(s) + 3Br2(g)  3+(aq) || Br-(aq) | Br2(g) | Pt(s)  
A)  2Cr(s) + 3Br2(g)    2Cr3+(aq) + 6Br-(aq)  
B)  Cr(s) + Cr3+(aq)    Br-(aq) + Br2(g)  
C)  2Cr3+(aq) + 6Br-(aq)    2Cr(s) + 3Br2(g)  
D)  Cr(s) + 3Br2(g)    Cr3+(s) + 2Br-(aq)  
E)  Cr(s) + 2Br-(aq)    Br2(g) + Cr3+(aq) " class="answers-bank-image d-inline" rel="preload" > Cr3+(s) + 2Br-(aq) 
E)  Cr(s) + 2Br-(aq)  3+(aq) || Br-(aq) | Br2(g) | Pt(s)  
A)  2Cr(s) + 3Br2(g)    2Cr3+(aq) + 6Br-(aq)  
B)  Cr(s) + Cr3+(aq)    Br-(aq) + Br2(g)  
C)  2Cr3+(aq) + 6Br-(aq)    2Cr(s) + 3Br2(g)  
D)  Cr(s) + 3Br2(g)    Cr3+(s) + 2Br-(aq)  
E)  Cr(s) + 2Br-(aq)    Br2(g) + Cr3+(aq) " class="answers-bank-image d-inline" rel="preload" > Br2(g) + Cr3+(aq) F) A) and B)
G) A) and C)

Question 19

In the following electrochemical cell,what is the reduction half reaction?
Mn(s) | Mn2+(aq) || Fe3+(aq) ,Fe2+(aq) | Pt(s)

Accepted Answer

A)  Fe3+(aq) + e− → Fe2+(aq) 
B)  Fe2+(aq) + e− → Fe3+(aq) 
C)  Fe2+(aq) + Pt(s) → Fe3+(aq) + e−
D)  Mn2+(aq) → Mn(s) + 2e−
E)  Mn(s) → Mn2+(aq) + 2e−F) D) and E)
G) A) and E)

Question 20

When the following oxidation-reduction reaction in acidic solution is balanced,what is the lowest whole-number coefficient for H+,and on which side of the balanced equation should it appear?
S2O82-(aq) + NO(g) → SO42-(aq) + NO3-(aq)

Accepted Answer

A)  4,product side
B)  8,reactant side
C)  12,reactant side
D)  8,product side
E)  4,reactant sideF) B) and E)
G) A) and C) D

Exam 19: Electrochemistry

A piece of iron half-immersed in a sodium chloride solution will corrode more rapidly than a piece of iron half-immersed in pure water,because

Correct Answer
verified

Given: Li⁺(aq) + e^- Li(s) ; E° = -3.04 V Mg²⁺(aq) + 2e^- Mg(s) ; E° = -2.38 V Fe²⁺(aq) + 2e^- Fe(s) ; E° = -0.41 V Ag⁺(aq) + e^- Ag(s) ; E° = 0.80 V Br₂(l) + 2e^- 2Br^-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent?

Correct Answer
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Correct Answer
verified

The cell potential of an electrochemical cell with the cell reaction 2Al(s) + 3Zn²⁺(aq) → 3Zn(s) + 2Al³⁺(aq) Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed?

Correct Answer
verified

A fuel cell designed to react grain alcohol with oxygen has the following net reaction: C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) The maximum work that 1 mol of alcohol can yield by this process is 1320 kJ.What is the theoretical maximum voltage that this cell can achieve?

Correct Answer
verified
A

Balance the following half-reaction occurring in acidic solution. NO₃^-(aq) →

Correct Answer
verified
A

Given: Zn²⁺(aq) + 2e^- Zn(s) ; E° = -0.76 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V Cr₂O₇^2-(aq) + 14H⁺(aq) + 6e^- 2Cr³⁺(aq) + 7H₂O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent?

Correct Answer
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An alkaline dry cell is similar to Leclanché cell,but it has _____ in place of ammonium chloride.

Correct Answer
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Correct Answer
verified

For a galvanic cell using Fe | Fe²⁺(1.0 M) and Pb | Pb²⁺(1.0 M) half-cells,which of the following statements is correct? Fe²⁺(aq) + 2e^- → Fe(s) ; E° = -0.41 V Pb²⁺(aq) + 2e^- → Pb(s) ; E° = -0.13 V

Correct Answer
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The _____ has zinc can as the anode; a graphite rod in the center,surrounded by a paste of manganese dioxide,ammonium and zinc chlorides,and carbon black,is the cathode.

Correct Answer
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What is the cell reaction for the following electrochemical cell? Zn | Zn²⁺(aq) || Sc³⁺(aq) | Sc

Correct Answer
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Correct Answer
verified

The process of producing a chemical change in an electrolytic cell is called _____.

Correct Answer
verified

Given: Mn²⁺(aq) + 2e^- Mn(s) ; E° = -1.18 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V Cr₂O₇^2-(aq) + 14H⁺(aq) + 6e^- 2Cr³⁺(aq) + 7H₂O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent?

Correct Answer
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If the cell is initially at standard-state conditions,which of the following statements is true? Zn²⁺(aq) + 2e^- Zn(s) ; E° = -0.76 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V

Correct Answer
verified

Correct Answer
verified

What is the cell reaction for the following voltaic cell? Cr(s) | Cr³⁺(aq) || Br^-(aq) | Br₂(g) | Pt(s)

Correct Answer
verified

In the following electrochemical cell,what is the reduction half reaction? Mn(s) | Mn²⁺(aq) || Fe³⁺(aq) ,Fe²⁺(aq) | Pt(s)

Correct Answer
verified

When the following oxidation-reduction reaction in acidic solution is balanced,what is the lowest whole-number coefficient for H⁺,and on which side of the balanced equation should it appear? S₂O₈^2-(aq) + NO(g) → SO₄^2-(aq) + NO₃^-(aq)

Correct Answer
verified
D

Exam 19: Electrochemistry

A piece of iron half-immersed in a sodium chloride solution will corrode more rapidly than a piece of iron half-immersed in pure water,because

Correct AnswerverifiedShow Answer

Given: Li+(aq) + e- Li(s) ; E° = -3.04 V Mg2+(aq) + 2e- Mg(s) ; E° = -2.38 V Fe2+(aq) + 2e- Fe(s) ; E° = -0.41 V Ag+(aq) + e- Ag(s) ; E° = 0.80 V Br2(l) + 2e- 2Br-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The cell potential of an electrochemical cell with the cell reaction 2Al(s) + 3Zn2+(aq) → 3Zn(s) + 2Al3+(aq) Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed?

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A fuel cell designed to react grain alcohol with oxygen has the following net reaction: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) The maximum work that 1 mol of alcohol can yield by this process is 1320 kJ.What is the theoretical maximum voltage that this cell can achieve?

Correct AnswerverifiedA

Balance the following half-reaction occurring in acidic solution. ​ NO3-(aq) →

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Given: Zn2+(aq) + 2e- Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e- Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e- 2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent?

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An alkaline dry cell is similar to Leclanché cell,but it has _____ in place of ammonium chloride.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For a galvanic cell using Fe | Fe2+(1.0 M) and Pb | Pb2+(1.0 M) half-cells,which of the following statements is correct? Fe2+(aq) + 2e- → Fe(s) ; E° = -0.41 V Pb2+(aq) + 2e- → Pb(s) ; E° = -0.13 V

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The _____ has zinc can as the anode; a graphite rod in the center,surrounded by a paste of manganese dioxide,ammonium and zinc chlorides,and carbon black,is the cathode.

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What is the cell reaction for the following electrochemical cell? Zn | Zn2+(aq) || Sc3+(aq) | Sc

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Correct AnswerverifiedShow Answer

The process of producing a chemical change in an electrolytic cell is called _____.

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Given: Mn2+(aq) + 2e- Mn(s) ; E° = -1.18 V Cu2+(aq) + 2e- Cu(s) ; E° = 0.34 V Cr2O72-(aq) + 14H+(aq) + 6e- 2Cr3+(aq) + 7H2O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent?

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If the cell is initially at standard-state conditions,which of the following statements is true? Zn2+(aq) + 2e- Zn(s) ; E° = -0.76 V Cu2+(aq) + 2e- Cu(s) ; E° = 0.34 V

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What is one of the major products in the electrolysis of a saturated aqueous sodium chloride solution? Reduction Half-Reaction E° (V) Na+(aq) + e- Na(s) -2.71 Mg2+(aq) + 2e- Mg(s) -2.37 2H2O(l) + 2e- H2(g) + 2OH-(aq) -0.83 O2(g) + 4H+(aq) + 4e- 2H2O(l) 1.23 Cl2(g) + 2e- 2Cl-(aq) 1.36

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What is the cell reaction for the following voltaic cell? Cr(s) | Cr3+(aq) || Br-(aq) | Br2(g) | Pt(s)

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In the following electrochemical cell,what is the reduction half reaction? Mn(s) | Mn2+(aq) || Fe3+(aq) ,Fe2+(aq) | Pt(s)

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When the following oxidation-reduction reaction in acidic solution is balanced,what is the lowest whole-number coefficient for H+,and on which side of the balanced equation should it appear? S2O82-(aq) + NO(g) → SO42-(aq) + NO3-(aq)

Correct AnswerverifiedD

Correct Answer
verified

Given: Li⁺(aq) + e^- Li(s) ; E° = -3.04 V Mg²⁺(aq) + 2e^- Mg(s) ; E° = -2.38 V Fe²⁺(aq) + 2e^- Fe(s) ; E° = -0.41 V Ag⁺(aq) + e^- Ag(s) ; E° = 0.80 V Br₂(l) + 2e^- 2Br^-(aq) ; E° = 1.07 V Which of the following species is the best oxidizing agent?

Correct Answer
verified

Correct Answer
verified

The cell potential of an electrochemical cell with the cell reaction 2Al(s) + 3Zn²⁺(aq) → 3Zn(s) + 2Al³⁺(aq) Is 1.607 V.What is the maximum electrical work obtainable from this cell when 2.0 mol of Al is consumed?

Correct Answer
verified

A fuel cell designed to react grain alcohol with oxygen has the following net reaction: C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) The maximum work that 1 mol of alcohol can yield by this process is 1320 kJ.What is the theoretical maximum voltage that this cell can achieve?

Correct Answer
verified
A

Balance the following half-reaction occurring in acidic solution. NO₃^-(aq) →

Correct Answer
verified
A

Given: Zn²⁺(aq) + 2e^- Zn(s) ; E° = -0.76 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V Cr₂O₇^2-(aq) + 14H⁺(aq) + 6e^- 2Cr³⁺(aq) + 7H₂O(l) ; E° = 1.33 V Which of the following species is the strongest oxidizing agent?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For a galvanic cell using Fe | Fe²⁺(1.0 M) and Pb | Pb²⁺(1.0 M) half-cells,which of the following statements is correct? Fe²⁺(aq) + 2e^- → Fe(s) ; E° = -0.41 V Pb²⁺(aq) + 2e^- → Pb(s) ; E° = -0.13 V

Correct Answer
verified

Correct Answer
verified

What is the cell reaction for the following electrochemical cell? Zn | Zn²⁺(aq) || Sc³⁺(aq) | Sc

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Given: Mn²⁺(aq) + 2e^- Mn(s) ; E° = -1.18 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V Cr₂O₇^2-(aq) + 14H⁺(aq) + 6e^- 2Cr³⁺(aq) + 7H₂O(l) ; E° = 1.33 V Which of the following species is the strongest reducing agent?

Correct Answer
verified

If the cell is initially at standard-state conditions,which of the following statements is true? Zn²⁺(aq) + 2e^- Zn(s) ; E° = -0.76 V Cu²⁺(aq) + 2e^- Cu(s) ; E° = 0.34 V

Correct Answer
verified

Correct Answer
verified

What is the cell reaction for the following voltaic cell? Cr(s) | Cr³⁺(aq) || Br^-(aq) | Br₂(g) | Pt(s)

Correct Answer
verified

In the following electrochemical cell,what is the reduction half reaction? Mn(s) | Mn²⁺(aq) || Fe³⁺(aq) ,Fe²⁺(aq) | Pt(s)

Correct Answer
verified

When the following oxidation-reduction reaction in acidic solution is balanced,what is the lowest whole-number coefficient for H⁺,and on which side of the balanced equation should it appear? S₂O₈^2-(aq) + NO(g) → SO₄^2-(aq) + NO₃^-(aq)

Correct Answer
verified
D