Question 1

In the following reaction: 2 Al (s) + 3 I2 (s) $\rightarrow$ 2 AlI3 (s) which species is the oxidizing agent?

Accepted Answer

A)  Al 
B)  AlI3 
C)  I2 
D)  none of the species 
A)  Al 
B)  AlI3 
C)  I2 
D)  none of the species

Question 2

In the reactions below, which reaction correctly identifies the anode reaction during the discharging (normal usage) of a lead storage battery cell?

Accepted Answer

A)  Pb + SO42-$\rightarrow$ PbSO4 + 2 e- 
B)  Zn + 2 OH- $\rightarrow$ZnO + H2O + 2 e- 
C)  2 MnO2 + H2O + 2 e-$\rightarrow$ Mn2O3 + 2 OH- 
D)  PbO2 + 4 H+ + SO42- + 2 e- $\rightarrow$ PbSO4 + 2 H2O 
A)  Pb + SO42-$\rightarrow$ PbSO4 + 2 e- 
B)  Zn + 2 OH- $\rightarrow$ZnO + H2O + 2 e- 
C)  2 MnO2 + H2O + 2 e-$\rightarrow$ Mn2O3 + 2 OH- 
D)  PbO2 + 4 H+ + SO42- + 2 e- $\rightarrow$ PbSO4 + 2 H2O

Question 3

In a galvanic cell, the cathode is the electrode at which ________ occurs?

Accepted Answer

A)  oxidation 
B)  reduction 
C)  oxidation and reduction 
D)  nothing 
A)  oxidation 
B)  reduction 
C)  oxidation and reduction 
D)  nothing

Question 4

Which of the following statements is not true of a redox reaction?

Accepted Answer

A)  The reducing agent is the substance oxidized. 
B)  The reducing agent gains electrons. 
C)  The substance oxidized loses electrons. 
D)  The oxidizing agent is the substance reduced. 
A)  The reducing agent is the substance oxidized. 
B)  The reducing agent gains electrons. 
C)  The substance oxidized loses electrons. 
D)  The oxidizing agent is the substance reduced.

Question 5

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word
-N2(g) + 3 H2(g)$\rightarrow$2 NH3(g) ____________________

Accepted Answer

A)  non-redox 
B)  redox 
A)  non-redox 
B)  redox

Question 6

Which of the following is a correctly balanced oxidation half-reaction?

Accepted Answer

A)  H2C2O4 $\rightarrow$2 CO2 + 2 H+ + 2e? 
B)  I2 + 2e- $\rightarrow$ 2 I- 
C)  HOCl + H+ + 2e- $\rightarrow$ Cl- + H2O 
D)  H2S $\rightarrow$S + 2 H+ + 4e- 
A)  H2C2O4 $\rightarrow$2 CO2 + 2 H+ + 2e? 
B)  I2 + 2e- $\rightarrow$ 2 I- 
C)  HOCl + H+ + 2e- $\rightarrow$ Cl- + H2O 
D)  H2S $\rightarrow$S + 2 H+ + 4e-

Question 7

The proper assignment of oxidation numbers to the elements in Na2CrO4 would be ________.

Accepted Answer

A)  +1 for Na, +6 for Cr and -2 for O 
B)  +2 for Na, +4 for Cr and -6 for O 
C)  +2 for Na, +3 for Cr and -2 for O 
D)  +2 for Na, +5 for Cr and -6 for O 
A)  +1 for Na, +6 for Cr and -2 for O 
B)  +2 for Na, +4 for Cr and -6 for O 
C)  +2 for Na, +3 for Cr and -2 for O 
D)  +2 for Na, +5 for Cr and -6 for O

Question 8

In the following reaction H2SO4 is ________.
H2SO4 + HI $\rightarrow$I2 + SO2 + H2O

Accepted Answer

A)  the oxidizing agent and is oxidized 
B)  the oxidizing agent and is reduced 
C)  the reducing agent and is oxidized 
D)  the reducing agent and is reduced 
A)  the oxidizing agent and is oxidized 
B)  the oxidizing agent and is reduced 
C)  the reducing agent and is oxidized 
D)  the reducing agent and is reduced

Question 9

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word
-2 Al(s) + 3 FeO(s) $\rightarrow$ 3 Fe(s) + Al2O3(s) ____________________

Accepted Answer

A)  non-redox 
B)  redox 
A)  non-redox 
B)  redox

Question 10

Identify which substance is oxidized and which substance is reduced in the following chemical reaction.
4 NH3 + 3 O2 → 2 N2 + 6 H2O

Accepted Answer

NH₃ is oxid

Question 11

Balance the following equation by the oxidation-number method.
Fe2O3 + CO → Fe + CO2

Accepted Answer

Fe₂O₃ + 3 CO

Question 12

When the redox reaction: NF3 + AlCl3 $\rightarrow$N2 + Cl2 + AlF3 is balanced, the correct coefficients for NF3 and Cl2, respectively, are ________.

Accepted Answer

A)  3 and 4 
B)  4 and 2 
C)  2 and 3 
D)  6 and 3 
A)  3 and 4 
B)  4 and 2 
C)  2 and 3 
D)  6 and 3

Question 13

Which reaction is the correctly balanced half reaction (in acid solution) for the process below?
Cr2O72- (aq) $\rightarrow$ Cr3+ (aq)

Accepted Answer

A)  14 H+ + Cr2O72- + 6 e- $\rightarrow$ 2 Cr3+ + 7 H2O 
B)  8 H+ + Cr2O7 + 3 e- $\rightarrow$ 2Cr3+ + 4 H2O 
C)  8 H+ + Cr2O7 $\rightarrow$ 2 Cr3+ + 4 H2O + 3 e- 
D)  12 H+ + Cr2O72- + 3 e- $\rightarrow$ 2 Cr3+ + 6 H2O 
A)  14 H+ + Cr2O72- + 6 e- $\rightarrow$ 2 Cr3+ + 7 H2O 
B)  8 H+ + Cr2O7 + 3 e- $\rightarrow$ 2Cr3+ + 4 H2O 
C)  8 H+ + Cr2O7 $\rightarrow$ 2 Cr3+ + 4 H2O + 3 e- 
D)  12 H+ + Cr2O72- + 3 e- $\rightarrow$ 2 Cr3+ + 6 H2O

Question 14

Determine the oxidation number of the underlined element in NaBrO4.

Accepted Answer

A)  +7 
B)  +4 
C)  -6 
D)  -4 
A)  +7 
B)  +4 
C)  -6 
D)  -4

Question 15

Which of the following equations is incorrectly classified as to type of chemical reaction?

Accepted Answer

A)  CaCO3 $\rightarrow$ CaO + CO2 decomposition/redox 
B)  H2O + SO2 $\rightarrow$H2SO3 synthesis/nonredox 
C)  Cl2 + F2 $\rightarrow$ 2 ClF synthesis/redox 
D)  AgNO3 + NaCl$\rightarrow$ AgCl + NaNO3 double-displacement/non-redox 
A)  CaCO3 $\rightarrow$ CaO + CO2 decomposition/redox 
B)  H2O + SO2 $\rightarrow$H2SO3 synthesis/nonredox 
C)  Cl2 + F2 $\rightarrow$ 2 ClF synthesis/redox 
D)  AgNO3 + NaCl$\rightarrow$ AgCl + NaNO3 double-displacement/non-redox

Question 16

Assign an oxidation number to each atom in the following chemical reaction.
As2O3 + 5 H2O + 2 I2 ? 2 H3AsO4 + 4 HI

Accepted Answer

Question 17

Write the balanced half reactions for oxidation and reduction for the following chemical equation.
Fe (s) + Cu(NO3)2 (aq) → Fe(NO3)3 (aq) + Cu (s)

Accepted Answer

oxidation: 2 Fe → 2

Question 18

How many electrons are lost or gained by each formula unit of CuBr2 in the reaction
Zn + CuBr2 $\rightarrow$ ZnBr2 + Cu

Accepted Answer

A)  gains 2 electrons 
B)  loses 2 electrons 
C)  loses 1 electron 
D)  gains 6 electrons 
A)  gains 2 electrons 
B)  loses 2 electrons 
C)  loses 1 electron 
D)  gains 6 electrons

Question 19

During the recharging of a lead storage battery, what products(s) are formed?

Accepted Answer

A)  PbO2 (s) and PbSO4 (s) 
B)  Pb (s) and PbO2 (s) 
C)  Pb (s) only 
D)  PbO2 (s) only 
A)  PbO2 (s) and PbSO4 (s) 
B)  Pb (s) and PbO2 (s) 
C)  Pb (s) only 
D)  PbO2 (s) only

Question 20

Balance the following reactions for the solution type indicted. Be sure to identify which is oxidized and reduced.

Accepted Answer

The answer of Balance the following reactions for the solution...

In the following reaction: 2 Al (s) + 3 I₂ (s) $\rightarrow$ 2 AlI₃ (s) which species is the oxidizing agent?

In the reactions below, which reaction correctly identifies the anode reaction during the discharging (normal usage) of a lead storage battery cell?

In a galvanic cell, the cathode is the electrode at which ________ occurs?

Which of the following statements is not true of a redox reaction?

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -N₂(g) + 3 H₂(g) $\rightarrow$ 2 NH₃(g) ____________________

Which of the following is a correctly balanced oxidation half-reaction?

The proper assignment of oxidation numbers to the elements in Na₂CrO₄ would be ________.

In the following reaction H₂SO₄ is ________. H₂SO₄ + HI $\rightarrow$ I₂ + SO₂ + H₂O

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -2 Al(s) + 3 FeO(s) $\rightarrow$ 3 Fe(s) + Al₂O₃(s) ____________________

Identify which substance is oxidized and which substance is reduced in the following chemical reaction. 4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O

Balance the following equation by the oxidation-number method. Fe₂O₃ + CO → Fe + CO₂

When the redox reaction: NF₃ + AlCl₃ $\rightarrow$ N₂ + Cl₂ + AlF₃ is balanced, the correct coefficients for NF₃ and Cl₂, respectively, are ________.

Which reaction is the correctly balanced half reaction (in acid solution) for the process below? Cr₂O₇^2- (aq) $\rightarrow$ Cr³⁺ (aq)

Determine the oxidation number of the underlined element in NaBrO₄.

Which of the following equations is incorrectly classified as to type of chemical reaction?

Assign an oxidation number to each atom in the following chemical reaction. As₂O₃ + 5 H₂O + 2 I₂ ? 2 H₃AsO₄ + 4 HI

Write the balanced half reactions for oxidation and reduction for the following chemical equation. Fe (s) + Cu(NO₃)₂(aq) → Fe(NO₃)₃(aq) + Cu (s)

How many electrons are lost or gained by each formula unit of CuBr₂ in the reaction Zn + CuBr₂ $\rightarrow$ ZnBr₂ + Cu

During the recharging of a lead storage battery, what products(s) are formed?

Balance the following reactions for the solution type indicted. Be sure to identify which is oxidized and reduced.

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Exam 15: Oxidation and Reduction

In the following reaction: 2 Al (s) + 3 I2 (s) →\rightarrow→ 2 AlI3 (s) which species is the oxidizing agent?

In the reactions below, which reaction correctly identifies the anode reaction during the discharging (normal usage) of a lead storage battery cell?

In a galvanic cell, the cathode is the electrode at which ________ occurs?

Which of the following statements is not true of a redox reaction?

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -N2(g) + 3 H2(g) →\rightarrow→ 2 NH3(g) ____________________

Which of the following is a correctly balanced oxidation half-reaction?

The proper assignment of oxidation numbers to the elements in Na2CrO4 would be ________.

In the following reaction H2SO4 is ________. H2SO4 + HI →\rightarrow→ I2 + SO2 + H2O

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -2 Al(s) + 3 FeO(s) →\rightarrow→ 3 Fe(s) + Al2O3(s) ____________________

Identify which substance is oxidized and which substance is reduced in the following chemical reaction. 4 NH3 + 3 O2 → 2 N2 + 6 H2O

Balance the following equation by the oxidation-number method. Fe2O3 + CO → Fe + CO2

When the redox reaction: NF3 + AlCl3 →\rightarrow→ N2 + Cl2 + AlF3 is balanced, the correct coefficients for NF3 and Cl2, respectively, are ________.

Which reaction is the correctly balanced half reaction (in acid solution) for the process below? Cr2O72- (aq) →\rightarrow→ Cr3+ (aq)

Determine the oxidation number of the underlined element in NaBrO4.

Which of the following equations is incorrectly classified as to type of chemical reaction?

Assign an oxidation number to each atom in the following chemical reaction. As2O3 + 5 H2O + 2 I2 ? 2 H3AsO4 + 4 HI

Write the balanced half reactions for oxidation and reduction for the following chemical equation. Fe (s) + Cu(NO3)2 (aq) → Fe(NO3)3 (aq) + Cu (s)

How many electrons are lost or gained by each formula unit of CuBr2 in the reaction Zn + CuBr2 →\rightarrow→ ZnBr2 + Cu

During the recharging of a lead storage battery, what products(s) are formed?

Balance the following reactions for the solution type indicted. Be sure to identify which is oxidized and reduced.

The Science of Chemistry

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Unit Systems and Dimensional Analysis

Basic Concepts About Matter

Atoms, Molecules, Formulas, and Subatomic Particles

Electronic Structure and Chemical Periodicity

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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

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In the following reaction: 2 Al (s) + 3 I₂ (s) $\rightarrow$ 2 AlI₃ (s) which species is the oxidizing agent?

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -N₂(g) + 3 H₂(g) $\rightarrow$ 2 NH₃(g) ____________________

The proper assignment of oxidation numbers to the elements in Na₂CrO₄ would be ________.

In the following reaction H₂SO₄ is ________. H₂SO₄ + HI $\rightarrow$ I₂ + SO₂ + H₂O

Indicate whether each of the following formula unit or net ionic equations is or is not a redox reaction by writing the word -2 Al(s) + 3 FeO(s) $\rightarrow$ 3 Fe(s) + Al₂O₃(s) ____________________

Identify which substance is oxidized and which substance is reduced in the following chemical reaction. 4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O

Balance the following equation by the oxidation-number method. Fe₂O₃ + CO → Fe + CO₂

When the redox reaction: NF₃ + AlCl₃ $\rightarrow$ N₂ + Cl₂ + AlF₃ is balanced, the correct coefficients for NF₃ and Cl₂, respectively, are ________.

Which reaction is the correctly balanced half reaction (in acid solution) for the process below? Cr₂O₇^2- (aq) $\rightarrow$ Cr³⁺ (aq)

Determine the oxidation number of the underlined element in NaBrO₄.

Assign an oxidation number to each atom in the following chemical reaction. As₂O₃ + 5 H₂O + 2 I₂ ? 2 H₃AsO₄ + 4 HI

Write the balanced half reactions for oxidation and reduction for the following chemical equation. Fe (s) + Cu(NO₃)₂(aq) → Fe(NO₃)₃(aq) + Cu (s)

How many electrons are lost or gained by each formula unit of CuBr₂ in the reaction Zn + CuBr₂ $\rightarrow$ ZnBr₂ + Cu