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

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 4

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

Accepted Answer

Question 5

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 6

Determine the oxidation number of the underlined element in NaBrO4.

Accepted Answer

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

Question 7

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 8

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 9

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 10

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 11

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 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

Question 13

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 14

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

Accepted Answer

Fe₂O₃ + 3 CO...

Question 15

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 16

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 17

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 18

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 19

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.

Question 20

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

Exam 15: Oxidation and Reduction

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

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

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

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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) ____________________

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

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Determine the oxidation number of the underlined element in NaBrO4.

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

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

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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

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

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

Correct AnswerverifiedFe2O3 + 3 CO...View AnswerShow Answer

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

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

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

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

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

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

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

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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

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

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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
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oxidation: 2 Fe → 2 ...
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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
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Correct Answer
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Determine the oxidation number of the underlined element in NaBrO₄.

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

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

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

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NH₃ is oxid...
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When the redox reaction: NF₃ + AlCl₃ $\rightarrow$ N₂ + Cl₂ + AlF₃ is balanced, the correct coefficients for NF₃ and Cl₂, respectively, are ________.

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

Correct Answer
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Fe₂O₃ + 3 CO...
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Correct Answer
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In the following reaction H₂SO₄ is ________. H₂SO₄ + HI $\rightarrow$ I₂ + SO₂ + H₂O

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

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

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

Correct Answer
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