Question 1

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

Question 2

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

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

Question 4

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

Question 5

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

Question 6

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 7

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 8

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

Question 9

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

Accepted Answer

Fe₂O₃ + 3 CO...

Question 10

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

Question 11

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

Question 12

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-

Question 13

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

Question 14

Determine the oxidation number of the underlined element in NaBrO4.

Accepted Answer

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

Question 15

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

Accepted Answer

Question 16

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

Question 17

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

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

Question 19

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...

Question 20

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.

Exam 15: Oxidation and Reduction

Determine the oxidation number of the underlined element in NaBrO4.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct Answerverifiedoxidation: 2 Fe → 2 ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFe2O3 + 3 CO...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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) ____________________

Correct AnswerverifiedShow Answer

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) ____________________

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedNH3 is oxid...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Determine the oxidation number of the underlined element in NaBrO₄.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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)

Correct Answer
verified
oxidation: 2 Fe → 2 ...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified
Fe₂O₃ + 3 CO...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified

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) ____________________

Correct Answer
verified

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) ____________________

Correct Answer
verified

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

Correct Answer
verified
NH₃ is oxid...
View Answer

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified