Question 1

Galvanized iron is protected from corrosion because zinc reduces any Fe2+ formed.

Accepted Answer

A) True 
 B)False  True

Question 2

The standard potential of the cell Ag(s)|AgCl(s)m Cl-(aq)|Cu2+(aq)|Cu(s)
Is +0.12 V at 25S1U1P1$\circ$S1S1P0C.If the standard potential of the Cu2+/Cu couple is +0.34 V,calculate the standard potential of the AgCl/Ag,Cl-couple.

Accepted Answer

A) -0.12 V 
B) -0.46 V 
C) +0.46 V 
D) -0.22 V 
E) +0.22 V 
A) -0.12 V 
B) -0.46 V 
C) +0.46 V 
D) -0.22 V 
E) +0.22 V E

Question 3

When the Ag(s)|AgCl(s)|Cl-(aq)electrode acts as a cathode,the reaction is

Accepted Answer

A) Ag+(aq)+ e-$\rightarrow$  Ag(s). 
B) Ag(s)+ Cl-(aq)$\rightarrow$  AgCl(s)+ e-  
C) Ag(s)$\rightarrow$ Ag+(aq)+ e-  
D) 2AgCl(s)+ 2e-$\rightarrow$  2Ag+(aq)+ Cl2(g). 
E) AgCl(s)+ e- $\rightarrow$ Ag(s)+ Cl-(aq). 
A) Ag+(aq)+ e-$\rightarrow$  Ag(s). 
B) Ag(s)+ Cl-(aq)$\rightarrow$  AgCl(s)+ e-  
C) Ag(s)$\rightarrow$ Ag+(aq)+ e-  
D) 2AgCl(s)+ 2e-$\rightarrow$  2Ag+(aq)+ Cl2(g). 
E) AgCl(s)+ e- $\rightarrow$ Ag(s)+ Cl-(aq). E

Question 4

Which of the following is the strongest oxidizing agent?

Accepted Answer

A) O3 
B) MnO4- 
C) Cr2O72- 
D) Cl2 
A) O3 
B) MnO4- 
C) Cr2O72- 
D) Cl2

Question 5

In order to convert hydrazine,N2H4,to nitric acid,

Accepted Answer

A) an oxidizing agent is required. 
B) a reducing agent is required. 
A) an oxidizing agent is required. 
B) a reducing agent is required.

Question 6

Consider the following cell: Zn(s)|Zn2+(aq,0.100 M)m Cl-(aq,? M)|Cl2(g,0.500 atm)|Pt
For this cell,ES1U1P1$\circ$S1S1P0 = 2.12 V and E = 2.27 V at 25S1U1P1$\circ$S1S1P0C.Calculate the Cl-(aq)concentration in the cathode compartment.

Accepted Answer

A) 1.2 * 10-1 M 
B) 4.3 *10-5 M 
C) 2.9 *10-3 M 
D) 1.5 * 10-3 M 
E) 6.5 * 10-3 M 
A) 1.2 * 10-1 M 
B) 4.3 *10-5 M 
C) 2.9 *10-3 M 
D) 1.5 * 10-3 M 
E) 6.5 * 10-3 M

Question 7

If ES1U1P1$\circ$S1S1P0 for the disproportionation of Cu+(aq)to Cu2+(aq)and Cu(s)is +0.18 V at 25S1U1P1$\circ$S1S1P0C,calculate the equilibrium constant for the reaction.

Accepted Answer

A) 1.2 * 106  
B) 3.9 * 1074  
C) 2.5 * 1014  
D) 35.7 
E) 3.3 * 1012  
A) 1.2 * 106  
B) 3.9 * 1074  
C) 2.5 * 1014  
D) 35.7 
E) 3.3 * 1012

Question 8

Consider the following cell:
Zn(s)|Zn2+(aq,0.200 M)m H+(aq,?)|H2(g,1.00 atm)|Pt
If E = +0.66 V and ES1U1P1$\circ$S1S1P0 = +0.76 V at 25S1U1P1$\circ$S1S1P0C,calculate the concentration of H+ in the cathode cell compartment.

Accepted Answer

A) 2.1 * 10-2 M 
B) 4.0 * 10-1 M 
C) 8.4 * 10 -5 M 
D) 9.2 *10 -3 M 
E) 4.0 * 10 -3 M 
A) 2.1 * 10-2 M 
B) 4.0 * 10-1 M 
C) 8.4 * 10 -5 M 
D) 9.2 *10 -3 M 
E) 4.0 * 10 -3 M

Question 9

The standard voltage of the cell Ag(s)|AgBr(s)|Br-(aq)m Ag+(aq)|Ag(s)
Is +0.73 V at 25S1U1P1$\circ$S1S1P0C.Calculate the Ksp for AgBr.

Accepted Answer

A) 3.9 * 10-29  
B) 2.2 * 1012  
C) 2.0 * 10-15  
D) 5.1 * 1014  
E) 4.6 *10-13  
A) 3.9 * 10-29  
B) 2.2 * 1012  
C) 2.0 * 10-15  
D) 5.1 * 1014  
E) 4.6 *10-13

Question 10

Use the following to answer questions  
-The galvanic cell shown above uses the half-cells Pb2+/Pb and Zn2+/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

Accepted Answer

A) True 
 B)False

Question 11

Given: Zn(s)+ OH-(aq)+ H2O(l)+ NO3-(aq)$\rightarrow$  Zn(OH)42-(aq)+ NH3(g) If the coefficient of NO3- in the balanced equation is 1,how many electrons are transferred in the reaction?

Accepted Answer

A) 10 
B) 6 
C) 2 
D) 4 
E) 8 
A) 10 
B) 6 
C) 2 
D) 4 
E) 8

Question 12

If the standard potential for Tl3+(aq)/Tl+(aq)is 1.21 V and the standard potential for Tl+(aq)/Tl(s)is -0.34 V,calculate the standard potential for Tl3+(aq)+ 3e-$\rightarrow$ Tl(s).

Accepted Answer

A) 0.69 V 
B) 0.87 V 
C) 1.55 V 
D) 0.09 V 
E) 0.29 V 
A) 0.69 V 
B) 0.87 V 
C) 1.55 V 
D) 0.09 V 
E) 0.29 V

Question 13

In the Daniell cell,the anode is zinc metal and the cathode is copper metal.When the cell operates,the anode gets smaller and the cathode gets larger.

Accepted Answer

A) True 
 B)False

Question 14

Consider the following cell at standard conditions: Zn(s)|Zn2+(aq)m Fe2+(aq)|Fe(s)
Calculate the value of $\Delta$GrS1U1P1$\circ$S1S1P0 for the reaction that occurs when current is drawn from this cell.

Accepted Answer

A) -62 kJ.mol-1  
B) -230 kJ.mol-1  
C) +62 kJ.mol-1  
D) +230 kJ.mol-1  
E) -31 kJ.mol-1  
A) -62 kJ.mol-1  
B) -230 kJ.mol-1  
C) +62 kJ.mol-1  
D) +230 kJ.mol-1  
E) -31 kJ.mol-1

Question 15

Which species will reduce Ag+ but not Fe2+?

Accepted Answer

A) Pt 
B) Au 
C) V 
D) Cr 
E) H2  
A) Pt 
B) Au 
C) V 
D) Cr 
E) H2

Question 16

What potential does a cell have that uses bromine to oxidize hydrogen to H+ under standard conditions at 298 K?

Accepted Answer

A) Negative 
B) 0 
C) Positive 
D) Negative at elevated pressure 
E) None of the above 
A) Negative 
B) 0 
C) Positive 
D) Negative at elevated pressure 
E) None of the above

Question 17

What current is required to produce 91.6 g of chromium meta from chromium(VI)oxide in 12.4 hours?

Accepted Answer

The answer of What current is required to produce 91.6...

Question 18

If the standard potentials for the couples Cu2+/Cu,Ag+/Ag,and Fe2+/Fe are +0.34,+0.80,and -0.44 V,respectively,which is the strongest reducing agent?

Accepted Answer

A) Fe 
B) Ag 
C) Ag+  
D) Cu 
E) Fe2+  
A) Fe 
B) Ag 
C) Ag+  
D) Cu 
E) Fe2+

Question 19

Consider the following cell:
Zn(s)|Zn2+(aq,0.10 M)m Cu2+(aq,0.10 M)|Cu(s)
At equilibrium,what is the concentration of Cu2+(aq)?

Accepted Answer

1.3 * 10<s

Question 20

Given: PH3(g)$\rightarrow$ P4(s),basic solution. How many electrons appear in the balanced half-reaction?

Accepted Answer

A) 12 
B) 9 
C) 6 
D) 8 
E) 3 
A) 12 
B) 9 
C) 6 
D) 8 
E) 3

Galvanized iron is protected from corrosion because zinc reduces any Fe²⁺ formed.

The standard potential of the cell Ag(s)|AgCl(s)m Cl^-(aq)|Cu²⁺(aq)|Cu(s) Is +0.12 V at 25^$\circ$C.If the standard potential of the Cu²⁺/Cu couple is +0.34 V,calculate the standard potential of the AgCl/Ag,Cl^-couple.

When the Ag(s)|AgCl(s)|Cl^-(aq)electrode acts as a cathode,the reaction is

Which of the following is the strongest oxidizing agent?

In order to convert hydrazine,N₂H₄,to nitric acid,

Consider the following cell: Zn(s)|Zn²⁺(aq,0.100 M)m Cl^-(aq,? M)|Cl₂(g,0.500 atm)|Pt For this cell,E^$\circ$ = 2.12 V and E = 2.27 V at 25^$\circ$C.Calculate the Cl^-(aq)concentration in the cathode compartment.

If E^$\circ$ for the disproportionation of Cu⁺(aq)to Cu²⁺(aq)and Cu(s)is +0.18 V at 25^$\circ$C,calculate the equilibrium constant for the reaction.

Consider the following cell: Zn(s)|Zn²⁺(aq,0.200 M)m H⁺(aq,?)|H₂(g,1.00 atm)|Pt If E = +0.66 V and E^$\circ$ = +0.76 V at 25^$\circ$C,calculate the concentration of H⁺ in the cathode cell compartment.

The standard voltage of the cell Ag(s)|AgBr(s)|Br^-(aq)m Ag⁺(aq)|Ag(s) Is +0.73 V at 25^$\circ$C.Calculate the K_sp for AgBr.

Use the following to answer questions -The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

Given: Zn(s)+ OH^-(aq)+ H₂O(l)+ NO₃^-(aq) $\rightarrow$ Zn(OH)₄²^-(aq)+ NH₃(g) If the coefficient of NO₃^- in the balanced equation is 1,how many electrons are transferred in the reaction?

If the standard potential for Tl³⁺(aq)/Tl⁺(aq)is 1.21 V and the standard potential for Tl⁺(aq)/Tl(s)is -0.34 V,calculate the standard potential for Tl³⁺(aq)+ 3e^- $\rightarrow$ Tl(s).

In the Daniell cell,the anode is zinc metal and the cathode is copper metal.When the cell operates,the anode gets smaller and the cathode gets larger.

Consider the following cell at standard conditions: Zn(s)|Zn²⁺(aq)m Fe²⁺(aq)|Fe(s) Calculate the value of $\Delta$ G_r^$\circ$ for the reaction that occurs when current is drawn from this cell.

Which species will reduce Ag⁺ but not Fe²⁺?

What potential does a cell have that uses bromine to oxidize hydrogen to H⁺ under standard conditions at 298 K?

What current is required to produce 91.6 g of chromium meta from chromium(VI)oxide in 12.4 hours?

If the standard potentials for the couples Cu²⁺/Cu,Ag⁺/Ag,and Fe²⁺/Fe are +0.34,+0.80,and -0.44 V,respectively,which is the strongest reducing agent?

Consider the following cell: Zn(s)|Zn²⁺(aq,0.10 M)m Cu²⁺(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Cu²⁺(aq)?

Given: PH₃(g) $\rightarrow$ P₄(s),basic solution. How many electrons appear in the balanced half-reaction?

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Exam 14: Electrochemistry

Galvanized iron is protected from corrosion because zinc reduces any Fe2+ formed.

The standard potential of the cell Ag(s)|AgCl(s)m Cl-(aq)|Cu2+(aq)|Cu(s) Is +0.12 V at 25 ∘\circ∘ C.If the standard potential of the Cu2+/Cu couple is +0.34 V,calculate the standard potential of the AgCl/Ag,Cl-couple.

When the Ag(s)|AgCl(s)|Cl-(aq)electrode acts as a cathode,the reaction is

Which of the following is the strongest oxidizing agent?

In order to convert hydrazine,N2H4,to nitric acid,

Consider the following cell: Zn(s)|Zn2+(aq,0.100 M)m Cl-(aq,? M)|Cl2(g,0.500 atm)|Pt For this cell,E ∘\circ∘ = 2.12 V and E = 2.27 V at 25 ∘\circ∘ C.Calculate the Cl-(aq)concentration in the cathode compartment.

If E ∘\circ∘ for the disproportionation of Cu+(aq)to Cu2+(aq)and Cu(s)is +0.18 V at 25 ∘\circ∘ C,calculate the equilibrium constant for the reaction.

Consider the following cell: Zn(s)|Zn2+(aq,0.200 M)m H+(aq,?)|H2(g,1.00 atm)|Pt If E = +0.66 V and E ∘\circ∘ = +0.76 V at 25 ∘\circ∘ C,calculate the concentration of H+ in the cathode cell compartment.

The standard voltage of the cell Ag(s)|AgBr(s)|Br-(aq)m Ag+(aq)|Ag(s) Is +0.73 V at 25 ∘\circ∘ C.Calculate the Ksp for AgBr.

Use the following to answer questions -The galvanic cell shown above uses the half-cells Pb2+/Pb and Zn2+/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

Given: Zn(s)+ OH-(aq)+ H2O(l)+ NO3-(aq) →\rightarrow→ Zn(OH)42-(aq)+ NH3(g) If the coefficient of NO3- in the balanced equation is 1,how many electrons are transferred in the reaction?

If the standard potential for Tl3+(aq)/Tl+(aq)is 1.21 V and the standard potential for Tl+(aq)/Tl(s)is -0.34 V,calculate the standard potential for Tl3+(aq)+ 3e- →\rightarrow→ Tl(s).

In the Daniell cell,the anode is zinc metal and the cathode is copper metal.When the cell operates,the anode gets smaller and the cathode gets larger.

Consider the following cell at standard conditions: Zn(s)|Zn2+(aq)m Fe2+(aq)|Fe(s) Calculate the value of Δ\DeltaΔ Gr ∘\circ∘ for the reaction that occurs when current is drawn from this cell.

Which species will reduce Ag+ but not Fe2+?

What potential does a cell have that uses bromine to oxidize hydrogen to H+ under standard conditions at 298 K?

What current is required to produce 91.6 g of chromium meta from chromium(VI)oxide in 12.4 hours?

If the standard potentials for the couples Cu2+/Cu,Ag+/Ag,and Fe2+/Fe are +0.34,+0.80,and -0.44 V,respectively,which is the strongest reducing agent?

Consider the following cell: Zn(s)|Zn2+(aq,0.10 M)m Cu2+(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Cu2+(aq)?

Given: PH3(g) →\rightarrow→ P4(s),basic solution. How many electrons appear in the balanced half-reaction?

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

The Properties of Gases

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

Galvanized iron is protected from corrosion because zinc reduces any Fe²⁺ formed.

The standard potential of the cell Ag(s)|AgCl(s)m Cl^-(aq)|Cu²⁺(aq)|Cu(s) Is +0.12 V at 25^$\circ$C.If the standard potential of the Cu²⁺/Cu couple is +0.34 V,calculate the standard potential of the AgCl/Ag,Cl^-couple.

When the Ag(s)|AgCl(s)|Cl^-(aq)electrode acts as a cathode,the reaction is

In order to convert hydrazine,N₂H₄,to nitric acid,

Consider the following cell: Zn(s)|Zn²⁺(aq,0.100 M)m Cl^-(aq,? M)|Cl₂(g,0.500 atm)|Pt For this cell,E^$\circ$ = 2.12 V and E = 2.27 V at 25^$\circ$C.Calculate the Cl^-(aq)concentration in the cathode compartment.

If E^$\circ$ for the disproportionation of Cu⁺(aq)to Cu²⁺(aq)and Cu(s)is +0.18 V at 25^$\circ$C,calculate the equilibrium constant for the reaction.

Consider the following cell: Zn(s)|Zn²⁺(aq,0.200 M)m H⁺(aq,?)|H₂(g,1.00 atm)|Pt If E = +0.66 V and E^$\circ$ = +0.76 V at 25^$\circ$C,calculate the concentration of H⁺ in the cathode cell compartment.

The standard voltage of the cell Ag(s)|AgBr(s)|Br^-(aq)m Ag⁺(aq)|Ag(s) Is +0.73 V at 25^$\circ$C.Calculate the K_sp for AgBr.

Use the following to answer questions -The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.The electrode B could be inert platinum metal or zinc.

Given: Zn(s)+ OH^-(aq)+ H₂O(l)+ NO₃^-(aq) $\rightarrow$ Zn(OH)₄²^-(aq)+ NH₃(g) If the coefficient of NO₃^- in the balanced equation is 1,how many electrons are transferred in the reaction?

If the standard potential for Tl³⁺(aq)/Tl⁺(aq)is 1.21 V and the standard potential for Tl⁺(aq)/Tl(s)is -0.34 V,calculate the standard potential for Tl³⁺(aq)+ 3e^- $\rightarrow$ Tl(s).

Consider the following cell at standard conditions: Zn(s)|Zn²⁺(aq)m Fe²⁺(aq)|Fe(s) Calculate the value of $\Delta$ G_r^$\circ$ for the reaction that occurs when current is drawn from this cell.

Which species will reduce Ag⁺ but not Fe²⁺?

What potential does a cell have that uses bromine to oxidize hydrogen to H⁺ under standard conditions at 298 K?

If the standard potentials for the couples Cu²⁺/Cu,Ag⁺/Ag,and Fe²⁺/Fe are +0.34,+0.80,and -0.44 V,respectively,which is the strongest reducing agent?

Consider the following cell: Zn(s)|Zn²⁺(aq,0.10 M)m Cu²⁺(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Cu²⁺(aq)?

Given: PH₃(g) $\rightarrow$ P₄(s),basic solution. How many electrons appear in the balanced half-reaction?