Question 1

In which of the following compounds is the oxidation number of oxygen not ?2?

Accepted Answer

A)  Ba(OH)2 
B)  Li2O2 
C)  NaClO2 
D)  Na2SO4 
A)  Ba(OH)2 
B)  Li2O2 
C)  NaClO2 
D)  Na2SO4 B

Question 2

In the redox reaction: 4 Cr + 3 O2 + 12 HBr $\rightarrow$ 4 CrBr3 + 6 H2O the change in oxidation number for O is from ________.

Accepted Answer

A)  +4 to -4 
B)  +2 to 0 
C)  0 to -2 
D)  +3 to 0 
A)  +4 to -4 
B)  +2 to 0 
C)  0 to -2 
D)  +3 to 0 C

Question 3

In the redox reaction: BaSO4 + 4 C $\rightarrow$BaS + 4 CO, the element reduced is ________.

Accepted Answer

A)  S in BaSO4 
B)  C 
C)  Ba in BaS 
D)  O in CO 
A)  S in BaSO4 
B)  C 
C)  Ba in BaS 
D)  O in CO A

Question 4

+7 is the oxidation number of ________.

Accepted Answer

A)  C in MgC2O4 
B)  S in H2SO4 
C)  Mn in KMnO4 
D)  Br in NaBrO3 
A)  C in MgC2O4 
B)  S in H2SO4 
C)  Mn in KMnO4 
D)  Br in NaBrO3

Question 5

Which substance is serving as the reducing agent in the following reaction?
Fe2S3 + 12 HNO3 $\rightarrow$ 2 Fe(NO3)3 + 3 S + 6 NO2 + 6 H2O

Accepted Answer

A)  HNO3 
B)  S 
C)  NO2 
D)  Fe2S3 
A)  HNO3 
B)  S 
C)  NO2 
D)  Fe2S3

Question 6

Which of the following statements concerning the lead storage battery is incorrect?

Accepted Answer

A)  PbSO4 is produced during the discharging of the battery. 
B)  PbO2 is consumed during the recharging of the battery. 
C)  Pb serves as the anode. 
D)  Pb coated with PbO2 serves as the cathode. 
A)  PbSO4 is produced during the discharging of the battery. 
B)  PbO2 is consumed during the recharging of the battery. 
C)  Pb serves as the anode. 
D)  Pb coated with PbO2 serves as the cathode.

Question 7

Which reaction below can be classified as a redox/decomposition reaction?

Accepted Answer

A)  2 CuO $\rightarrow$ 2 Cu + O2 
B)  2 NO + O2$\rightarrow$ 2 NO2 
C)  Sn + Cu(NO3)2$\rightarrow$ Sn(NO3)2 + Cu 
D)  Cu(NO3)2 + 2 NaOH$\rightarrow$Cu(OH)2 + 2 NaNO3 
A)  2 CuO $\rightarrow$ 2 Cu + O2 
B)  2 NO + O2$\rightarrow$ 2 NO2 
C)  Sn + Cu(NO3)2$\rightarrow$ Sn(NO3)2 + Cu 
D)  Cu(NO3)2 + 2 NaOH$\rightarrow$Cu(OH)2 + 2 NaNO3

Question 8

When the half-reaction: MnO4- $\rightarrow$ Mn2+ (acidic solution) is correctly balanced, ________.

Accepted Answer

A)  the H+ and H2O are both on the left side of the equation 
B)  the H+ and H2O are both on the right side of the equation 
C)  the H+ is on the left side, and the H2O on the right side of the equation 
D)  the H+ is on the right side, and the H2O on the left side of the equation 
A)  the H+ and H2O are both on the left side of the equation 
B)  the H+ and H2O are both on the right side of the equation 
C)  the H+ is on the left side, and the H2O on the right side of the equation 
D)  the H+ is on the right side, and the H2O on the left side of the equation

Question 9

In the redox reaction: Al + MnO2 $\rightarrow$ Al2O3 + Mn, the oxidizing agent is ________.

Accepted Answer

A)  Al 
B)  Mn in MnO2 
C)  O in MnO2 
D)  O in Al2O3 
A)  Al 
B)  Mn in MnO2 
C)  O in MnO2 
D)  O in Al2O3

Question 10

Balance the following net ionic equation using the half reaction method (in acidic solution). What is the sum of the coefficients for the balanced reaction?
MnO4- + SO32-$\rightarrow$ Mn2+ + SO42-

Accepted Answer

A)  27 
B)  29 
C)  21 
D)  23 
A)  27 
B)  29 
C)  21 
D)  23

Question 11

Balance the following half reaction in acidic solution.
NO3? ? NO

Accepted Answer

3 e^? + 4 H⁺

Question 12

Balance the following half reaction in basic solution.
S2? ? SO32?

Accepted Answer

6 OH^? + S^2? ?

Question 13

In which of the following compounds is the oxidation number of hydrogen not +1?

Accepted Answer

A)  NaH 
B)  H2SO4 
C)  NaClO2 
D)  NH3 
A)  NaH 
B)  H2SO4 
C)  NaClO2 
D)  NH3

Question 14

Determine the oxidation number of C in NaHCO3.

Accepted Answer

A)  +6 
B)  +12 
C)  +4 
D)  +5 
A)  +6 
B)  +12 
C)  +4 
D)  +5

Question 15

Which of the following reactions is not a redox reaction?

Accepted Answer

A)  SO3 + H2O $\rightarrow$H2SO4 
B)  2 Na + Mg2+ $\rightarrow$ Mg + 2 Na+ 
C)  Cl2 + 2I- $\rightarrow$ 2 Cl- + I2 
D)  Na + AgNO3 $\rightarrow$ NaNO3 + Ag 
A)  SO3 + H2O $\rightarrow$H2SO4 
B)  2 Na + Mg2+ $\rightarrow$ Mg + 2 Na+ 
C)  Cl2 + 2I- $\rightarrow$ 2 Cl- + I2 
D)  Na + AgNO3 $\rightarrow$ NaNO3 + Ag

Question 16

The oxidation number of Cr in K2Cr2O7 is ________.

Accepted Answer

A)  +6 
B)  +5 
C)  +4 
D)  +2 
A)  +6 
B)  +5 
C)  +4 
D)  +2

Question 17

Which of the following is a correct statement about galvanic cells?

Accepted Answer

A)  Chemical energy is converted entirely into heat energy. 
B)  They are always based on a nonspontaneous redox reaction. 
C)  They may employ an oxidation process or a reduction process but never both. 
D)  Electrical energy is produced from a spontaneous redox reaction. 
A)  Chemical energy is converted entirely into heat energy. 
B)  They are always based on a nonspontaneous redox reaction. 
C)  They may employ an oxidation process or a reduction process but never both. 
D)  Electrical energy is produced from a spontaneous redox reaction.

Question 18

The pure element zinc has an oxidation number of ________, while in a compound like ZnSO4 the oxidation number for zinc is ________.

Accepted Answer

A)  0, 0 
B)  0, +1 
C)  +1, 0 
D)  0, +2 
A)  0, 0 
B)  0, +1 
C)  +1, 0 
D)  0, +2

Question 19

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients?
HNO2 + Cr2O7-2 $\rightarrow$ Cr+3 + NO3-

Accepted Answer

A)  17 
B)  18 
C)  19 
D)  20 
A)  17 
B)  18 
C)  19 
D)  20

Question 20

Indicate the missing words (or phrases) in the following definition: "An oxidation number is the ________ that an atom ________ when the electrons in each bond it is participating in are assigned to the ________ electronegative of the two atoms involved in the bond."

Accepted Answer

A)  number of electrons, definitely has, more 
B)  number of electrons, appears to have, less 
C)  charge, appears to have, more 
D)  charge, definitely has, less 
A)  number of electrons, definitely has, more 
B)  number of electrons, appears to have, less 
C)  charge, appears to have, more 
D)  charge, definitely has, less

In which of the following compounds is the oxidation number of oxygen not ?2?

In the redox reaction: 4 Cr + 3 O₂ + 12 HBr $\rightarrow$ 4 CrBr₃ + 6 H₂O the change in oxidation number for O is from ________.

In the redox reaction: BaSO₄ + 4 C $\rightarrow$ BaS + 4 CO, the element reduced is ________.

+7 is the oxidation number of ________.

Which substance is serving as the reducing agent in the following reaction? Fe₂S₃ + 12 HNO₃ $\rightarrow$ 2 Fe(NO₃)₃ + 3 S + 6 NO₂ + 6 H₂O

Which of the following statements concerning the lead storage battery is incorrect?

Which reaction below can be classified as a redox/decomposition reaction?

When the half-reaction: MnO₄^- $\rightarrow$ Mn²⁺ (acidic solution) is correctly balanced, ________.

In the redox reaction: Al + MnO₂ $\rightarrow$ Al₂O₃ + Mn, the oxidizing agent is ________.

Balance the following net ionic equation using the half reaction method (in acidic solution). What is the sum of the coefficients for the balanced reaction? MnO₄^- + SO₃^2- $\rightarrow$ Mn²⁺ + SO₄^2-

Balance the following half reaction in acidic solution. NO₃^? ? NO

Balance the following half reaction in basic solution. S^2? ? SO₃^2?

In which of the following compounds is the oxidation number of hydrogen not +1?

Determine the oxidation number of C in NaHCO₃.

Which of the following reactions is not a redox reaction?

The oxidation number of Cr in K₂Cr₂O₇ is ________.

Which of the following is a correct statement about galvanic cells?

The pure element zinc has an oxidation number of , while in a compound like ZnSO₄ the oxidation number for zinc is .

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients? HNO₂ + Cr₂O₇^-2 $\rightarrow$ Cr⁺³ + NO₃^-

Indicate the missing words (or phrases) in the following definition: "An oxidation number is the that an atom when the electrons in each bond it is participating in are assigned to the electronegative of the two atoms involved in the bond."

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Exam 15: Oxidation and Reduction

In which of the following compounds is the oxidation number of oxygen not ?2?

In the redox reaction: 4 Cr + 3 O2 + 12 HBr →\rightarrow→ 4 CrBr3 + 6 H2O the change in oxidation number for O is from ________.

In the redox reaction: BaSO4 + 4 C →\rightarrow→ BaS + 4 CO, the element reduced is ________.

+7 is the oxidation number of ________.

Which substance is serving as the reducing agent in the following reaction? Fe2S3 + 12 HNO3 →\rightarrow→ 2 Fe(NO3)3 + 3 S + 6 NO2 + 6 H2O

Which of the following statements concerning the lead storage battery is incorrect?

Which reaction below can be classified as a redox/decomposition reaction?

When the half-reaction: MnO4- →\rightarrow→ Mn2+ (acidic solution) is correctly balanced, ________.

In the redox reaction: Al + MnO2 →\rightarrow→ Al2O3 + Mn, the oxidizing agent is ________.

Balance the following net ionic equation using the half reaction method (in acidic solution). What is the sum of the coefficients for the balanced reaction? MnO4- + SO32- →\rightarrow→ Mn2+ + SO42-

Balance the following half reaction in acidic solution. NO3? ? NO

Balance the following half reaction in basic solution. S2? ? SO32?

In which of the following compounds is the oxidation number of hydrogen not +1?

Determine the oxidation number of C in NaHCO3.

Which of the following reactions is not a redox reaction?

The oxidation number of Cr in K2Cr2O7 is ________.

Which of the following is a correct statement about galvanic cells?

The pure element zinc has an oxidation number of ________, while in a compound like ZnSO4 the oxidation number for zinc is ________.

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients? HNO2 + Cr2O7-2 →\rightarrow→ Cr+3 + NO3-

Indicate the missing words (or phrases) in the following definition: "An oxidation number is the ________ that an atom ________ when the electrons in each bond it is participating in are assigned to the ________ electronegative of the two atoms involved in the bond."

The Science of Chemistry

Numbers From Measurements

Unit Systems and Dimensional Analysis

Basic Concepts About Matter

Atoms, Molecules, Formulas, and Subatomic Particles

Electronic Structure and Chemical Periodicity

Chemical Bonds

Chemical Nomenclature

Chemical Calculations: the Mole Concept and Chemical Formulas

Chemical Calculations Involving Chemical Equations

States of Matter

Gas Laws

Solutions

Acids, Bases and Salts

Reaction Rates and Chemical Equilibrium

Nuclear Chemistry

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In the redox reaction: 4 Cr + 3 O₂ + 12 HBr $\rightarrow$ 4 CrBr₃ + 6 H₂O the change in oxidation number for O is from ________.

In the redox reaction: BaSO₄ + 4 C $\rightarrow$ BaS + 4 CO, the element reduced is ________.

Which substance is serving as the reducing agent in the following reaction? Fe₂S₃ + 12 HNO₃ $\rightarrow$ 2 Fe(NO₃)₃ + 3 S + 6 NO₂ + 6 H₂O

When the half-reaction: MnO₄^- $\rightarrow$ Mn²⁺ (acidic solution) is correctly balanced, ________.

In the redox reaction: Al + MnO₂ $\rightarrow$ Al₂O₃ + Mn, the oxidizing agent is ________.

Balance the following net ionic equation using the half reaction method (in acidic solution). What is the sum of the coefficients for the balanced reaction? MnO₄^- + SO₃^2- $\rightarrow$ Mn²⁺ + SO₄^2-

Balance the following half reaction in acidic solution. NO₃^? ? NO

Balance the following half reaction in basic solution. S^2? ? SO₃^2?

Determine the oxidation number of C in NaHCO₃.

The oxidation number of Cr in K₂Cr₂O₇ is ________.

The pure element zinc has an oxidation number of , while in a compound like ZnSO₄ the oxidation number for zinc is .

When the following equation is balanced, by the half reaction method, in an acidic solution what is the sum of the coefficients? HNO₂ + Cr₂O₇^-2 $\rightarrow$ Cr⁺³ + NO₃^-

Indicate the missing words (or phrases) in the following definition: "An oxidation number is the that an atom when the electrons in each bond it is participating in are assigned to the electronegative of the two atoms involved in the bond."