Question 1

In balancing the half-reaction
SO42-(aq)  
S(s)how many H+ ions are added to which side?

Accepted Answer

A) 4 H+ to the left side 
B) 8 H+ to the right side 
C) 4 H+ to the right side 
D) 8 H+ to the left side 
E) 6 H+ to the left side 
A) 4 H+ to the left side 
B) 8 H+ to the right side 
C) 4 H+ to the right side 
D) 8 H+ to the left side 
E) 6 H+ to the left side D

Question 2

When zinc is plated to iron,the zinc corrodes rather than the iron.Which statement is true?

Accepted Answer

A) Zinc is less reactive than iron 
B) Zinc is more active metal than iron 
C) Zinc is a better oxidizing agent than iron 
D) Iron is a better reducing agent than zinc 
E) Both metals are Lewis metals 
A) Zinc is less reactive than iron 
B) Zinc is more active metal than iron 
C) Zinc is a better oxidizing agent than iron 
D) Iron is a better reducing agent than zinc 
E) Both metals are Lewis metals B

Question 3

Identify the reduction half-reaction in the redox equation:
4 Ag + O2(g)+ 2 H2O  
4 Ag+ + 4 OH-

Accepted Answer

A) Ag   Ag + e- 
B) 4 Ag + 4 e-      4 Ag+ 
C) 2 H2O + 2e-      4 OH- 
D) O2(g)+ 2 H2O + 4 e-      4 OH- 
E) 2 H2O + 2 e-   H2 + 2 OH- 
A) Ag   Ag + e- 
B) 4 Ag + 4 e-      4 Ag+ 
C) 2 H2O + 2e-      4 OH- 
D) O2(g)+ 2 H2O + 4 e-      4 OH- 
E) 2 H2O + 2 e-   H2 + 2 OH- D

Question 4

In the reaction of carbon with oxygen,which substance is oxidized? The equation for the reaction is
C(s)+ O2(g)  
CO2(g).

Accepted Answer

A) O2(g) 
B) CO2(g) 
C) No substance is oxidized in this reaction 
D) C(s) 
E) Both C(s)and O2(g) 
A) O2(g) 
B) CO2(g) 
C) No substance is oxidized in this reaction 
D) C(s) 
E) Both C(s)and O2(g)

Question 5

What is the oxidizing agent in this redox reaction?
2 MnO2(s)+ 2 NH4Cl(s)+ Zn(s)  
Zn(NH3)2Cl2(s)+ Mn2O3(s)+ H2O(   )

Accepted Answer

A) NH4Cl 
B) MnO2 
C) Zn 
D) Zn(NH3)2Cl2 
E) Mn2O3 
A) NH4Cl 
B) MnO2 
C) Zn 
D) Zn(NH3)2Cl2 
E) Mn2O3

Question 6

Which among the following are the parts that comprose an electrolytic cell?
(i)Two electrodes
(ii)A molecular liquid
(iii)A salt bridge
(iv)An ionic solution

Accepted Answer

A) i and ii 
B) i and iv 
C) ii,iii,and iv 
D) i,ii,and iii 
E) i,iii,and iv 
A) i and ii 
B) i and iv 
C) ii,iii,and iv 
D) i,ii,and iii 
E) i,iii,and iv

Question 7

Consider the following beakers.In the beaker on the left copper metal is placed in a solution of silver nitrate.The reaction is allowed to run for 60 minutes producing the products shown on the right.    
The equation for the oxidation half-reaction would be:

Accepted Answer

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

Question 8

What is the reducing agent in the reaction of hydrazine as a rocket fuel: N2H4(   )+ O2(g)   N2(g)+ 2 H2O(   )?

Accepted Answer

A) N2H4 
B) O2 
C) N2 
D) H2O 
E) There is no reducing agent in this reaction 
A) N2H4 
B) O2 
C) N2 
D) H2O 
E) There is no reducing agent in this reaction

Question 9

What is the oxidation number of titanium in TiO2?

Accepted Answer

A) +4 
B) +2 
C) +6 
D) -4 
E) zero 
A) +4 
B) +2 
C) +6 
D) -4 
E) zero

Question 10

What is the oxidation number of sulfur in sulfite ion,SO32-?

Accepted Answer

A) +6 
B) +4 
C) -2 
D) +2 
E) -4 
A) +6 
B) +4 
C) -2 
D) +2 
E) -4

Question 11

Consider the following table of relative strengths of oxidizing and reducing agents:
Oxidizing Agent
Reducing Agent
Stronger
A+ + e-  
A
Weaker
$\downarrow$
B2+ + 2 e-  
B
$\uparrow$ 
Weaker
C3+ + 3 e-  
C
Stronger
Which correctly lists the oxidizing agents in order of increasing strength?

Accepted Answer

A) A + 2+ 3+ 
D) B2+ + 3+ 
E) C3+ 2+ + 
A) A + 2+ 3+ 
D) B2+ + 3+ 
E) C3+ 2+ +

Question 12

Which of the following is the half-reaction for reduction of chlorine to chloride ions in water?

Accepted Answer

A) Cl2(aq)   Cl-(aq)+ Cl+(aq) 
B) Cl-(aq)+ H+(aq)   HCl(aq) 
C) 2 Cl-(aq)+ 2 e-   Cl2(aq) 
D) Cl2(aq)+ 2 e-   2 Cl-(aq) 
E) 2 Cl-(aq)   Cl2(aq)+ 2 e- 
A) Cl2(aq)   Cl-(aq)+ Cl+(aq) 
B) Cl-(aq)+ H+(aq)   HCl(aq) 
C) 2 Cl-(aq)+ 2 e-   Cl2(aq) 
D) Cl2(aq)+ 2 e-   2 Cl-(aq) 
E) 2 Cl-(aq)   Cl2(aq)+ 2 e-

Question 13

Examine the two beakers shown below.    
If the metals were connected by a wire containing a meter and the two solutions by a salt bridge,the meter shows are reading of 0.95 V.Which of the following is correct?

Accepted Answer

A) A spontaneous reaction occurs. 
B) A voltaic cell has been constructed. 
C) Electrons flow from the anode to the cathode. 
D) Reduction occurs at the cathode. 
E) All of the above are correct in this situation. 
A) A spontaneous reaction occurs. 
B) A voltaic cell has been constructed. 
C) Electrons flow from the anode to the cathode. 
D) Reduction occurs at the cathode. 
E) All of the above are correct in this situation.

Question 14

Which substance gets reduced in this redox reaction?
Pb(s)+ PbO2(s)+ 2 H2SO4(aq)  
2 PbSO4(s)+ 2 H2O(   )

Accepted Answer

A) H2SO4(s) 
B) Pb(s) 
C) PbO2(s) 
D) PbSO4(s) 
E) No substance is reduced in this reaction 
A) H2SO4(s) 
B) Pb(s) 
C) PbO2(s) 
D) PbSO4(s) 
E) No substance is reduced in this reaction

Question 15

Consider the following table of relative strengths of oxidizing and reducing agents:
Oxidizing Agent
Reducing Agent
Stronger
A+ + e-  
A
Weaker
$\downarrow$
B2+ + 2 e-  
B
$\uparrow$ 
Weaker
C3+ + 3 e-  
C
Stronger
Which of the following is the correct net ionic equation for the redox reaction between A+ and C and the correct direction that is favored?

Accepted Answer

A) A+ + C   A + C3+ forward 
B) A+ + C   A + C3+ reverse 
C) 3 A+ + C   3 A + C3+ forward 
D) 3 A+ + C   3 A + C3+ reverse 
E) A+ + C + e-   A + C3+ + 3 e- forward 
A) A+ + C   A + C3+ forward 
B) A+ + C   A + C3+ reverse 
C) 3 A+ + C   3 A + C3+ forward 
D) 3 A+ + C   3 A + C3+ reverse 
E) A+ + C + e-   A + C3+ + 3 e- forward

Question 16

How many electrons are transferred in the balanced redox equation that results from combining these two half-reactions on a molar scale?
Al  
Al3+ + 3e- and Cu2+ + 2 e-  
Cu

Accepted Answer

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

Question 17

Identify the oxidation half-reaction in the following group.

Accepted Answer

A) Ag(NH3)2 + e-   Ag + 2 NH3 
B) Ag + Cl-   AgCl + e- 
C) PbSO4(s)+ 2 e-   Pb(s)+ SO42- 
D) Ag(CN)2 + e-   Ag + 2 CN- 
E) Cr2O72- + H2O   2 CrO42- + 2 H+ 
A) Ag(NH3)2 + e-   Ag + 2 NH3 
B) Ag + Cl-   AgCl + e- 
C) PbSO4(s)+ 2 e-   Pb(s)+ SO42- 
D) Ag(CN)2 + e-   Ag + 2 CN- 
E) Cr2O72- + H2O   2 CrO42- + 2 H+

Question 18

What is the balanced redox equation that results from the combination of the following half-reactions?
Cr3+ + 3e-  
Cr and 2 Cl-  
Cl2 + 2 e-

Accepted Answer

A) CrCl2+ + e-   Cr + Cl2 
B) Cr3+ + 2 Cl- + e-   Cr + Cl2 
C) Cr3+ + 3 Cl-   CrCl3 
D) 2 Cr3+ + 6 Cl- + 3 e-   3 Cl2 + 2 Cr + 2 e- 
E) 2 Cr3+ + 6 Cl-   3 Cl2 + 2 Cr 
A) CrCl2+ + e-   Cr + Cl2 
B) Cr3+ + 2 Cl- + e-   Cr + Cl2 
C) Cr3+ + 3 Cl-   CrCl3 
D) 2 Cr3+ + 6 Cl- + 3 e-   3 Cl2 + 2 Cr + 2 e- 
E) 2 Cr3+ + 6 Cl-   3 Cl2 + 2 Cr

Question 19

What is the oxidation number of Cl in Cl2?

Accepted Answer

A) -1 
B) -2 
C) +2 
D) 0 
E) One atom is +1 and the other is -1. 
A) -1 
B) -2 
C) +2 
D) 0 
E) One atom is +1 and the other is -1.

Question 20

What role does the reducing agent play in a redox reaction?

Accepted Answer

A) It catalyzes the reaction 
B) It picks up electrons 
C) It picks up protons from the oxidizing agent 
D) It donates protons to the oxidizing agent 
E) It donates some of its electrons 
A) It catalyzes the reaction 
B) It picks up electrons 
C) It picks up protons from the oxidizing agent 
D) It donates protons to the oxidizing agent 
E) It donates some of its electrons

In balancing the half-reaction SO₄²^-(aq) S(s)how many H⁺ ions are added to which side?

When zinc is plated to iron,the zinc corrodes rather than the iron.Which statement is true?

Identify the reduction half-reaction in the redox equation: 4 Ag + O₂(g)+ 2 H₂O 4 Ag⁺ + 4 OH^-

In the reaction of carbon with oxygen,which substance is oxidized? The equation for the reaction is C(s)+ O₂(g) CO₂(g).

What is the oxidizing agent in this redox reaction? 2 MnO₂(s)+ 2 NH₄Cl(s)+ Zn(s) Zn(NH₃)₂Cl₂(s)+ Mn₂O₃(s)+ H₂O( )

Which among the following are the parts that comprose an electrolytic cell? (i)Two electrodes (ii)A molecular liquid (iii)A salt bridge (iv)An ionic solution

Consider the following beakers.In the beaker on the left copper metal is placed in a solution of silver nitrate.The reaction is allowed to run for 60 minutes producing the products shown on the right. The equation for the oxidation half-reaction would be:

What is the reducing agent in the reaction of hydrazine as a rocket fuel: N₂H₄( )+ O₂(g) N₂(g)+ 2 H₂O( )?

What is the oxidation number of titanium in TiO₂?

What is the oxidation number of sulfur in sulfite ion,SO₃²^-?

Which of the following is the half-reaction for reduction of chlorine to chloride ions in water?

Examine the two beakers shown below. If the metals were connected by a wire containing a meter and the two solutions by a salt bridge,the meter shows are reading of 0.95 V.Which of the following is correct?

Which substance gets reduced in this redox reaction? Pb(s)+ PbO₂(s)+ 2 H₂SO₄(aq) 2 PbSO₄(s)+ 2 H₂O( )

How many electrons are transferred in the balanced redox equation that results from combining these two half-reactions on a molar scale? Al Al³⁺ + 3e^- and Cu²⁺ + 2 e^- Cu

Identify the oxidation half-reaction in the following group.

What is the balanced redox equation that results from the combination of the following half-reactions? Cr³⁺ + 3e^- Cr and 2 Cl^- Cl₂ + 2 e^-

What is the oxidation number of Cl in Cl₂?

What role does the reducing agent play in a redox reaction?

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Exam 19: Oxidation-Reduction Redoxreactions

In balancing the half-reaction SO42-(aq) S(s)how many H+ ions are added to which side?

When zinc is plated to iron,the zinc corrodes rather than the iron.Which statement is true?

Identify the reduction half-reaction in the redox equation: 4 Ag + O2(g)+ 2 H2O 4 Ag+ + 4 OH-

In the reaction of carbon with oxygen,which substance is oxidized? The equation for the reaction is C(s)+ O2(g) CO2(g).

What is the oxidizing agent in this redox reaction? 2 MnO2(s)+ 2 NH4Cl(s)+ Zn(s) Zn(NH3)2Cl2(s)+ Mn2O3(s)+ H2O( )

Which among the following are the parts that comprose an electrolytic cell? (i)Two electrodes (ii)A molecular liquid (iii)A salt bridge (iv)An ionic solution

Consider the following beakers.In the beaker on the left copper metal is placed in a solution of silver nitrate.The reaction is allowed to run for 60 minutes producing the products shown on the right. The equation for the oxidation half-reaction would be:

What is the reducing agent in the reaction of hydrazine as a rocket fuel: N2H4( )+ O2(g) N2(g)+ 2 H2O( )?

What is the oxidation number of titanium in TiO2?

What is the oxidation number of sulfur in sulfite ion,SO32-?

Consider the following table of relative strengths of oxidizing and reducing agents: Oxidizing Agent Reducing Agent Stronger A+ + e- A Weaker ↓\downarrow↓ B2+ + 2 e- B ↑\uparrow↑ Weaker C3+ + 3 e- C Stronger Which correctly lists the oxidizing agents in order of increasing strength?

Which of the following is the half-reaction for reduction of chlorine to chloride ions in water?

Examine the two beakers shown below. If the metals were connected by a wire containing a meter and the two solutions by a salt bridge,the meter shows are reading of 0.95 V.Which of the following is correct?

Which substance gets reduced in this redox reaction? Pb(s)+ PbO2(s)+ 2 H2SO4(aq) 2 PbSO4(s)+ 2 H2O( )

How many electrons are transferred in the balanced redox equation that results from combining these two half-reactions on a molar scale? Al Al3+ + 3e- and Cu2+ + 2 e- Cu

Identify the oxidation half-reaction in the following group.

What is the balanced redox equation that results from the combination of the following half-reactions? Cr3+ + 3e- Cr and 2 Cl- Cl2 + 2 e-

What is the oxidation number of Cl in Cl2?

What role does the reducing agent play in a redox reaction?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: the Nuclear Model of the Atom

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: the Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, liquids, and Solids

Solutions

Acid-Base Proton-Transferreactions

Chemical Equilibrium

Nuclear Chemistry

Organic Chemistry

Biochemistry

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In balancing the half-reaction SO₄²^-(aq) S(s)how many H⁺ ions are added to which side?

Identify the reduction half-reaction in the redox equation: 4 Ag + O₂(g)+ 2 H₂O 4 Ag⁺ + 4 OH^-

In the reaction of carbon with oxygen,which substance is oxidized? The equation for the reaction is C(s)+ O₂(g) CO₂(g).

What is the oxidizing agent in this redox reaction? 2 MnO₂(s)+ 2 NH₄Cl(s)+ Zn(s) Zn(NH₃)₂Cl₂(s)+ Mn₂O₃(s)+ H₂O( )

What is the reducing agent in the reaction of hydrazine as a rocket fuel: N₂H₄( )+ O₂(g) N₂(g)+ 2 H₂O( )?

What is the oxidation number of titanium in TiO₂?

What is the oxidation number of sulfur in sulfite ion,SO₃²^-?

Which substance gets reduced in this redox reaction? Pb(s)+ PbO₂(s)+ 2 H₂SO₄(aq) 2 PbSO₄(s)+ 2 H₂O( )

How many electrons are transferred in the balanced redox equation that results from combining these two half-reactions on a molar scale? Al Al³⁺ + 3e^- and Cu²⁺ + 2 e^- Cu

What is the balanced redox equation that results from the combination of the following half-reactions? Cr³⁺ + 3e^- Cr and 2 Cl^- Cl₂ + 2 e^-

What is the oxidation number of Cl in Cl₂?