Question 1

Assign the oxidation state of each atom in sodium sulfate,Na2SO4.

Accepted Answer

A) Na = +1,S = +4,O = -2 
B) Na = +1,S = -2,O = +4 
C) Na = +2,S = +6,O = -2 
D) Na = +1,S = +6,O = -2 
E) Na = +2,S = -2,O = 0 
A) Na = +1,S = +4,O = -2 
B) Na = +1,S = -2,O = +4 
C) Na = +2,S = +6,O = -2 
D) Na = +1,S = +6,O = -2 
E) Na = +2,S = -2,O = 0

Question 2

Using the activity list included in this problem,which element/ion is the most resistant to reduction? 
Activity Series =

Accepted Answer

A)    
B) Pb 
C)    
D)    
E) none of the above 
A)    
B) Pb 
C)    
D)    
E) none of the above

Question 3

An electrolytic cell is a spontaneous redox reaction.

Accepted Answer

A) True 
 B)False

Question 4

The reaction 2 NO2 → N2O4 would not be considered a redox reaction.

Accepted Answer

A) True 
 B)False

Question 5

From the activity list included in this problem,which element will not dissolve in dilute hydrochloric acid? 
Activity Series =

Accepted Answer

A) Sn 
B) Pb 
C)    
D) Cu 
E) none of the above 
A) Sn 
B) Pb 
C)    
D) Cu 
E) none of the above

Question 6

Rusting of iron requires the presence of both oxygen and water.

Accepted Answer

A) True 
 B)False

Question 7

From the activity list included in this problem,which element/ion is the easiest to reduce? 
Activity Series =

Accepted Answer

A)    
B) Pb 
C)    
D)    
E) none of the above 
A)    
B) Pb 
C)    
D)    
E) none of the above

Question 8

The sum of the oxidation numbers of all atoms in K2Cr2O7 equals zero.

Accepted Answer

A) True 
 B)False

Question 9

In an electrochemical cell,which of the following statements is FALSE?

Accepted Answer

A) The anode is the electrode where oxidation occurs. 
B) A salt bridge provides electrical contact between the half-cells. 
C) The cathode is the electrode where reduction occurs. 
D) A spontaneous electrochemical cell is called a galvanic cell. 
E) All of the above are true. 
A) The anode is the electrode where oxidation occurs. 
B) A salt bridge provides electrical contact between the half-cells. 
C) The cathode is the electrode where reduction occurs. 
D) A spontaneous electrochemical cell is called a galvanic cell. 
E) All of the above are true.

Question 10

To achieve the largest battery voltage possible,the battery should be assembled from a metal high on the activity series list with a metal ion low on the activity series list.

Accepted Answer

A) True 
 B)False

Question 11

Corrosion of metals may be prevented by keeping them dry at all times.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following are typically TRUE of a reducing agent? 
1.It causes reduction.
2.It gains electron(s).
3.It is the oxidized substance.

Accepted Answer

A) 1 and 2 only 
B) 1 and 3 only 
C) 2 and 3 only 
D) All of 1,2,and 3 
E) Neither 1,2 or 3 
A) 1 and 2 only 
B) 1 and 3 only 
C) 2 and 3 only 
D) All of 1,2,and 3 
E) Neither 1,2 or 3

Question 13

It can be shown that copper metal lies below H2 on the activity series of metals.This means that copper will dissolve in hydrochloric acid.

Accepted Answer

A) True 
 B)False

Question 14

What is the oxidation state of the underlined atom in the compound: 
H2S   ?

Accepted Answer

A) +1 
B) +2 
C) -2 
D) +6 
E) +4 
A) +1 
B) +2 
C) -2 
D) +6 
E) +4

Question 15

Using the activity list included in this problem,which element/ion is the most resistant to oxidation? 
Activity Series =

Accepted Answer

A)    
B) Pb 
C)    
D)    
E) none of the above 
A)    
B) Pb 
C)    
D)    
E) none of the above

Question 16

A sacrificial electrode works by being reduced which prevents the metal from being oxidized.

Accepted Answer

A) True 
 B)False

Question 17

In the reaction S + O2 → SO2 ,the O2 is being oxidized.

Accepted Answer

A) True 
 B)False

Question 18

Balance the following half reaction in acid solution: 
  (aq)

Accepted Answer

A)    →   + 3   
B)    + 8   →   + 4   O 
C)    + 8   →   + 4   O +5   
D)    + 8   + 5   →   + 4   O 
E) none of the above 
A)    →   + 3   
B)    + 8   →   + 4   O 
C)    + 8   →   + 4   O +5   
D)    + 8   + 5   →   + 4   O 
E) none of the above

Question 19

From the activity list included in this problem,which element will displace   ions from solution? 
Activity Series =

Accepted Answer

A) Sn 
B) Pb 
C)    
D) Cu 
E) none of the above 
A) Sn 
B) Pb 
C)    
D) Cu 
E) none of the above

Question 20

In an electrochemical cell,which of the following statements is FALSE?

Accepted Answer

A) Oxidation occurs at the anode. 
B) Reduction occurs at the cathode. 
C) Electrons flow through the salt bridge to complete the cell. 
D) A spontaneous electrochemical cell is called a voltaic cell. 
E) All of the above are true. 
A) Oxidation occurs at the anode. 
B) Reduction occurs at the cathode. 
C) Electrons flow through the salt bridge to complete the cell. 
D) A spontaneous electrochemical cell is called a voltaic cell. 
E) All of the above are true.

Assign the oxidation state of each atom in sodium sulfate,Na₂SO₄.

Using the activity list included in this problem,which element/ion is the most resistant to reduction? Activity Series =

An electrolytic cell is a spontaneous redox reaction.

The reaction 2 NO₂ → N₂O₄ would not be considered a redox reaction.

From the activity list included in this problem,which element will not dissolve in dilute hydrochloric acid? Activity Series =

Rusting of iron requires the presence of both oxygen and water.

From the activity list included in this problem,which element/ion is the easiest to reduce? Activity Series =

The sum of the oxidation numbers of all atoms in K₂Cr₂O₇ equals zero.

In an electrochemical cell,which of the following statements is FALSE?

To achieve the largest battery voltage possible,the battery should be assembled from a metal high on the activity series list with a metal ion low on the activity series list.

Corrosion of metals may be prevented by keeping them dry at all times.

Which of the following are typically TRUE of a reducing agent? 1.It causes reduction. 2.It gains electron(s). 3.It is the oxidized substance.

It can be shown that copper metal lies below H₂ on the activity series of metals.This means that copper will dissolve in hydrochloric acid.

What is the oxidation state of the underlined atom in the compound: H₂S ?

Using the activity list included in this problem,which element/ion is the most resistant to oxidation? Activity Series =

A sacrificial electrode works by being reduced which prevents the metal from being oxidized.

In the reaction S + O₂→ SO₂ ,the O₂ is being oxidized.

Balance the following half reaction in acid solution: (aq)

From the activity list included in this problem,which element will displace ions from solution? Activity Series =

In an electrochemical cell,which of the following statements is FALSE?

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 16: Oxidation and Reduction

Assign the oxidation state of each atom in sodium sulfate,Na2SO4.

Using the activity list included in this problem,which element/ion is the most resistant to reduction? Activity Series =

An electrolytic cell is a spontaneous redox reaction.

The reaction 2 NO2 → N2O4 would not be considered a redox reaction.

From the activity list included in this problem,which element will not dissolve in dilute hydrochloric acid? Activity Series =

Rusting of iron requires the presence of both oxygen and water.

From the activity list included in this problem,which element/ion is the easiest to reduce? Activity Series =

The sum of the oxidation numbers of all atoms in K2Cr2O7 equals zero.

In an electrochemical cell,which of the following statements is FALSE?

To achieve the largest battery voltage possible,the battery should be assembled from a metal high on the activity series list with a metal ion low on the activity series list.

Corrosion of metals may be prevented by keeping them dry at all times.

Which of the following are typically TRUE of a reducing agent? 1.It causes reduction. 2.It gains electron(s). 3.It is the oxidized substance.

It can be shown that copper metal lies below H2 on the activity series of metals.This means that copper will dissolve in hydrochloric acid.

What is the oxidation state of the underlined atom in the compound: H2S ?

Using the activity list included in this problem,which element/ion is the most resistant to oxidation? Activity Series =

A sacrificial electrode works by being reduced which prevents the metal from being oxidized.

In the reaction S + O2 → SO2 ,the O2 is being oxidized.

Balance the following half reaction in acid solution: (aq)

From the activity list included in this problem,which element will displace ions from solution? Activity Series =

In an electrochemical cell,which of the following statements is FALSE?

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Assign the oxidation state of each atom in sodium sulfate,Na₂SO₄.

The reaction 2 NO₂ → N₂O₄ would not be considered a redox reaction.

The sum of the oxidation numbers of all atoms in K₂Cr₂O₇ equals zero.

It can be shown that copper metal lies below H₂ on the activity series of metals.This means that copper will dissolve in hydrochloric acid.

What is the oxidation state of the underlined atom in the compound: H₂S ?

In the reaction S + O₂→ SO₂ ,the O₂ is being oxidized.