Question 1

Equations that are written to represent either an oxidation reaction or a reduction reaction are called half-reactions.

Accepted Answer

A) True 
 B)False

Question 2

The figure shows the electrolysis of molten NaI.What reaction occurs at the anode of this cell?

Accepted Answer

A) NaI(l)$\rightarrow$NaI2(l) 
B) I-(l) + e- $\rightarrow$I2-  
C) Na+(l) + e- $\rightarrow$Na(l) 
D) 2I-(l) + e-$\rightarrow$I2(g) 
E) 2I-(l) $\rightarrow$I2(g) + 2e-  
A) NaI(l)$\rightarrow$NaI2(l) 
B) I-(l) + e- $\rightarrow$I2-  
C) Na+(l) + e- $\rightarrow$Na(l) 
D) 2I-(l) + e-$\rightarrow$I2(g) 
E) 2I-(l) $\rightarrow$I2(g) + 2e-

Question 3

The figure shows a molecular-level representation of the following voltaic cell: Mg(s) + Sn2+(aq) $\rightarrow$ Mg2+(aq) + Sn(s) When drawing the "after" representation one would note that:

Accepted Answer

A) the tin electrode will be smaller. 
B) the magnesium electrode will be larger. 
C) the number of Mg2+ ions in solution will remain constant. 
D) deposits will form in the salt bridge. 
E) the number of Sn2+ ions in solution will decrease. 
A) the tin electrode will be smaller. 
B) the magnesium electrode will be larger. 
C) the number of Mg2+ ions in solution will remain constant. 
D) deposits will form in the salt bridge. 
E) the number of Sn2+ ions in solution will decrease.

Question 4

Consider the half-reaction NO3-(aq) $\rightarrow$ NO(aq).When the equation is balanced in acid solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Accepted Answer

A) 2, 3 
B) 2, 6 
C) 3, 6 
D) 4, 4 
E) 3, 2 
A) 2, 3 
B) 2, 6 
C) 3, 6 
D) 4, 4 
E) 3, 2

Question 5

What are the oxidation numbers of the atoms in the AsO43- ion?

Accepted Answer

A) As = 0, O = 1- 
B) As = 1+, O = 1- 
C) As = 3-, O = 0 
D) As = 3+, O = 2- 
E) As = 5+, O = 2- 
A) As = 0, O = 1- 
B) As = 1+, O = 1- 
C) As = 3-, O = 0 
D) As = 3+, O = 2- 
E) As = 5+, O = 2-

Question 6

The following reaction occurs in a lead storage battery: PbO2(s) + Pb(s) + H2SO4(aq) ⇌ 2PbSO4(s) + 2H2O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

Accepted Answer

A) Sulfate ions are consumed and their concentration decreases. 
B) Protons are released so the pH drops. 
C) The solution gets increasingly more viscous due to an increase in sulfuric acid concentration. 
D) Its concentration increases. 
E) All of these are correct. 
A) Sulfate ions are consumed and their concentration decreases. 
B) Protons are released so the pH drops. 
C) The solution gets increasingly more viscous due to an increase in sulfuric acid concentration. 
D) Its concentration increases. 
E) All of these are correct.

Question 7

The products of the electrolysis of molten magnesium chloride are

Accepted Answer

A) H2(g) and O2(g) 
B) Mg(l) and OH-(aq) 
C) Mg(l) and Cl2(g) 
D) H2(g) and Cl2(g) 
E) Mg(l) and O2(g) 
A) H2(g) and O2(g) 
B) Mg(l) and OH-(aq) 
C) Mg(l) and Cl2(g) 
D) H2(g) and Cl2(g) 
E) Mg(l) and O2(g)

Question 8

A voltaic cell is prepared in which aluminum metal is oxidized to Al3+, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

Accepted Answer

A) Al(s) + Ni2+(aq) $\rightarrow$Al3+(aq) + Ni(s) 
B) Al(s) + 2Ni2+(aq) $\rightarrow$ Al3+(aq) + 2Ni(s) 
C) 2Al(s) + 3Ni2+(aq)$\rightarrow$2Al3+(aq) + 3Ni(s) 
D) Al3+(aq) + 2Ni(s) $\rightarrow$Al(s) + 2Ni2+(aq) 
E) 2Al3+(aq) + 3Ni(s) $\rightarrow$2Al(s) + 3Ni2+(aq) 
A) Al(s) + Ni2+(aq) $\rightarrow$Al3+(aq) + Ni(s) 
B) Al(s) + 2Ni2+(aq) $\rightarrow$ Al3+(aq) + 2Ni(s) 
C) 2Al(s) + 3Ni2+(aq)$\rightarrow$2Al3+(aq) + 3Ni(s) 
D) Al3+(aq) + 2Ni(s) $\rightarrow$Al(s) + 2Ni2+(aq) 
E) 2Al3+(aq) + 3Ni(s) $\rightarrow$2Al(s) + 3Ni2+(aq)

Question 9

What are the oxidation numbers of the atoms in the Cr2O72- ion?

Accepted Answer

A) Cr = 1-, O = 0 
B) Cr = 0, O = 2- 
C) Cr = 6+, O = 2- 
D) Cr = 7+, O = 2- 
E) Cr = 3+, O = 1- 
A) Cr = 1-, O = 0 
B) Cr = 0, O = 2- 
C) Cr = 6+, O = 2- 
D) Cr = 7+, O = 2- 
E) Cr = 3+, O = 1-

Question 10

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel evaporative (swamp) cooler from corrosion.Cu 2 < Sn < Fe < Zn < Mg

Accepted Answer

A) Cu or Sn 
B) Cu, H2, or Sn 
C) Cu only 
D) Mg only 
E) Zn or Mg 
A) Cu or Sn 
B) Cu, H2, or Sn 
C) Cu only 
D) Mg only 
E) Zn or Mg

Question 11

The cathode is the electrode at which oxidation occurs.

Accepted Answer

A) True 
 B)False

Question 12

What are the oxidation numbers of the atoms in the MnO4- ion?

Accepted Answer

A) Mn = 0, O = 1- 
B) Mn = 3+, O = 1- 
C) Mn = 7+, O = 2- 
D) Mn = 8+, O = 2- 
E) Mn = 1-, O = 0 
A) Mn = 0, O = 1- 
B) Mn = 3+, O = 1- 
C) Mn = 7+, O = 2- 
D) Mn = 8+, O = 2- 
E) Mn = 1-, O = 0

Question 13

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel ship's hull from corrosion.Cu 2 < Sn < Fe < Zn < Mg

Accepted Answer

A) Cu or Sn 
B) Cu, H2, or Sn 
C) Cu only 
D) Mg only 
E) Zn or Mg 
A) Cu or Sn 
B) Cu, H2, or Sn 
C) Cu only 
D) Mg only 
E) Zn or Mg

Question 14

A voltaic cell is prepared in which copper metal is oxidized to Cu(II), and silver ion is reduced to silver metal.Which of the following represents the correctly balanced equation for this reaction?

Accepted Answer

A) Cu(s) + Ag+(aq) $\rightarrow$Cu2+(aq) + Ag(s) 
B) 2Cu(s) + Ag+(aq) $\rightarrow$2Cu2+(aq) + Ag(s) 
C) Cu(s) + 2Ag+(aq) $\rightarrow$Cu2+(aq) + 2Ag(s) 
D) 3Cu(s) + 2Ag+(aq) $\rightarrow$3Cu2+(aq) + 2Ag(s) 
E) 2Cu(s) + 3Ag+(aq) $\rightarrow$2Cu2+(aq) + 3Ag(s) 
A) Cu(s) + Ag+(aq) $\rightarrow$Cu2+(aq) + Ag(s) 
B) 2Cu(s) + Ag+(aq) $\rightarrow$2Cu2+(aq) + Ag(s) 
C) Cu(s) + 2Ag+(aq) $\rightarrow$Cu2+(aq) + 2Ag(s) 
D) 3Cu(s) + 2Ag+(aq) $\rightarrow$3Cu2+(aq) + 2Ag(s) 
E) 2Cu(s) + 3Ag+(aq) $\rightarrow$2Cu2+(aq) + 3Ag(s)

Question 15

In which of the following choices is the oxidation number incorrect?

Accepted Answer

A) Fe3+(aq); oxidation number = 3+ 
B) I-(aq); oxidation number = 1- 
C) Cl2(s); oxidation number = 1- 
D) Cu+(aq); oxidation number = 1+ 
E) Ni(s); oxidation number = 0 
A) Fe3+(aq); oxidation number = 3+ 
B) I-(aq); oxidation number = 1- 
C) Cl2(s); oxidation number = 1- 
D) Cu+(aq); oxidation number = 1+ 
E) Ni(s); oxidation number = 0

Question 16

Batteries are electrochemical cells that are constructed so that a barrier separates the oxidation reaction from the reduction reaction.

Accepted Answer

A) True 
 B)False

Question 17

A steel utility pole (made primarily of iron) can be protected from oxidation by attaching a piece of copper, or some other relatively inactive metal, to it.

Accepted Answer

A) True 
 B)False

Equations that are written to represent either an oxidation reaction or a reduction reaction are called half-reactions.

The figure shows the electrolysis of molten NaI.What reaction occurs at the anode of this cell?

Consider the half-reaction NO₃-(aq) $\rightarrow$ NO(aq).When the equation is balanced in acid solution, the coefficient for water will be, and the number of electrons transferred will be .

What are the oxidation numbers of the atoms in the AsO₄³^- ion?

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

The products of the electrolysis of molten magnesium chloride are

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

What are the oxidation numbers of the atoms in the Cr₂O₇²^- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel evaporative (swamp) cooler from corrosion.Cu < H₂ < Sn < Fe < Zn < Mg

The cathode is the electrode at which oxidation occurs.

What are the oxidation numbers of the atoms in the MnO₄- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel ship's hull from corrosion.Cu < H₂ < Sn < Fe < Zn < Mg

A voltaic cell is prepared in which copper metal is oxidized to Cu(II), and silver ion is reduced to silver metal.Which of the following represents the correctly balanced equation for this reaction?

In which of the following choices is the oxidation number incorrect?

Batteries are electrochemical cells that are constructed so that a barrier separates the oxidation reaction from the reduction reaction.

A steel utility pole (made primarily of iron) can be protected from oxidation by attaching a piece of copper, or some other relatively inactive metal, to it.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 14: Oxidation-Reduction Reactions

Equations that are written to represent either an oxidation reaction or a reduction reaction are called half-reactions.

The figure shows the electrolysis of molten NaI.What reaction occurs at the anode of this cell?

The figure shows a molecular-level representation of the following voltaic cell: Mg(s) + Sn2+(aq) →\rightarrow→ Mg2+(aq) + Sn(s) When drawing the "after" representation one would note that:

Consider the half-reaction NO3-(aq) →\rightarrow→ NO(aq).When the equation is balanced in acid solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

What are the oxidation numbers of the atoms in the AsO43- ion?

The following reaction occurs in a lead storage battery: PbO2(s) + Pb(s) + H2SO4(aq) ⇌ 2PbSO4(s) + 2H2O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

The products of the electrolysis of molten magnesium chloride are

A voltaic cell is prepared in which aluminum metal is oxidized to Al3+, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

What are the oxidation numbers of the atoms in the Cr2O72- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel evaporative (swamp) cooler from corrosion.Cu < H2 < Sn < Fe < Zn < Mg

The cathode is the electrode at which oxidation occurs.

What are the oxidation numbers of the atoms in the MnO4- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel ship's hull from corrosion.Cu < H2 < Sn < Fe < Zn < Mg

A voltaic cell is prepared in which copper metal is oxidized to Cu(II), and silver ion is reduced to silver metal.Which of the following represents the correctly balanced equation for this reaction?

In which of the following choices is the oxidation number incorrect?

Batteries are electrochemical cells that are constructed so that a barrier separates the oxidation reaction from the reduction reaction.

A steel utility pole (made primarily of iron) can be protected from oxidation by attaching a piece of copper, or some other relatively inactive metal, to it.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Consider the half-reaction NO₃-(aq) $\rightarrow$ NO(aq).When the equation is balanced in acid solution, the coefficient for water will be, and the number of electrons transferred will be .

What are the oxidation numbers of the atoms in the AsO₄³^- ion?

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

What are the oxidation numbers of the atoms in the Cr₂O₇²^- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel evaporative (swamp) cooler from corrosion.Cu < H₂ < Sn < Fe < Zn < Mg

What are the oxidation numbers of the atoms in the MnO₄- ion?

Given the following information about the activity series, select element(s) that could be used to protect the iron in a steel ship's hull from corrosion.Cu < H₂ < Sn < Fe < Zn < Mg