Question 1

Consider the half-reaction O₂(aq)→ OH^-(aq). When the equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

To balance the half-reaction in basic solution, we need to first balance the elements other than hydrogen and oxygen. We have 1 O on the left and 2 O's on the right, so we need to add a water molecule to the left to balance the O's: O₂(aq) → OH^-(aq) + H2O(l) Next, we need to balance the hydrogen by adding hydroxide ions to the left: O₂(aq) + 2 OH-(aq) → OH^-(aq) + H2O(l) Now the equation is balanced for mass, but we need to balance the charge by adding electrons to the left: O₂(aq) + 2 OH-(aq) + 4 e- → OH^-(aq) + H2O(l) Therefore, the coefficient for water is 2, and the number of electrons transferred is 4. The answer is (C).

Question 2

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

Accepted Answer

The answer of The figure shows the electrolysis of molten...

Question 3

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

Accepted Answer

The answer of The figure shows the electrolysis of molten...

Question 4

The figure shows the electrolysis of molten AlCl₃. What is the balanced equation for the reaction?

Accepted Answer

The balanced equation for the electrolysis of molten AlCl3 is 2AlCl3(l) → 2Al(l) + 3Cl2(g). The question specifies that the compound being electrolyzed is AlCl3 with a molar ratio of 1:1:3 for Al, Cl, and Sb. Therefore, in order to keep the same ratio of Al and Cl in the reaction, we need to multiply the balanced equation by 1/3, resulting in the equation: 
2/3 AlCl3(l) → 2/3 Al(l) + 1 Cl2(g)
Since the molar ratio of Sb is 0, it is not included in the balanced equation. Therefore, the correct choice is C, which is the only equation that includes AlCl3 and produces Al(l) and Cl2(g) in the correct ratio according to the given molar ratio.

Question 5

Consider the reaction: Al(s)+ H₂O(l)→ Al(OH)₄⁻(aq)+ H₂(g)When this equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

The balanced equation in basic solution is $4Al + 12H_2O \rightarrow 4Al(OH)_4^- + 3H_2$, requiring 6 water molecules on the reactant side and involving the transfer of 12 electrons (3 electrons per aluminum atom, 4 aluminum atoms). However, the correct number of electrons transferred was not provided in the options, indicating a mistake in the question or in the interpretation. The closest match based on the water coefficient is option D, but it inaccurately represents the number of electrons transferred.

Question 6

Consider the reaction: CrO₄²⁻(aq)+ HSO₃⁻(aq)→ Cr³⁺(aq)+ SO₄²⁻(aq)When this equation is balanced in acidic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

In acidic solution, the balanced equation will have 5 water molecules, and 6 electrons are transferred in the redox reaction.

Question 7

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s)+ ZnCl₂(aq)→

Accepted Answer

Magnesium is more reactive than zinc according to the activity series, so it will replace zinc in the compound to form magnesium chloride and elemental zinc. Therefore the balanced equation is: Mg(s) + ZnCl2(aq) → MgCl2(aq) + Zn(s).

Question 8

In any electrolytic cell, the cathode is the electrode

Accepted Answer

The cathode is the electrode where reduction occurs.

Question 9

Consider the half-reaction ClO⁻(aq)→ Cl⁻(aq). When the equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

The answer of Consider the half-reaction ClO⁻(aq)→ Cl⁻(aq). When the...

Question 10

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s)+ HCl(aq)→

Accepted Answer

Mg is above hydrogen in the activity series, indicating it can displace hydrogen in an acid to form magnesium chloride (MgCl2) and hydrogen gas (H2). The balanced equation is Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g).

Question 11

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Cu(s)+ SnCl₂(aq)→

Accepted Answer

Since Cu is less reactive than Sn, it cannot displace Sn from its compound, so no reaction will occur.

Question 12

Consider the reaction: Zn(s)+ NO₃⁻(aq)→ NH₃(aq)+ Zn(OH)₄²⁻(aq)When this equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

First, we need to balance the equation: Zn(s) + NO₃⁻(aq) → NH₃(aq) + Zn(OH)₄²⁻(aq) Zn(s) + NO3-(aq) + OH-(aq) → NH3(aq) + Zn(OH)42-(aq) Now, we need to calculate the number of electrons transferred. We can do this by looking at the oxidation states of each element in the equation. Zn(s) has an oxidation state of 0, while Zn(OH)42-(aq) has an oxidation state of -2. This means that Zn has lost 2 electrons. NO3-(aq) has an oxidation state of +5, while NH3(aq) has an oxidation state of -3. This means that each nitrogen atom has gained 4 electrons. Overall, the equation involves the transfer of 2 electrons from zinc to nitrogen. Therefore, the answer is choice C: 6 waters are needed (2 for the hydroxide ions on the reactant side and 4 for the zinc hydroxide on the product side) and 8 electrons are transferred.

Question 13

The products of the electrolysis of molten magnesium chloride are

Accepted Answer

The electrolysis of molten magnesium chloride results in the production of magnesium metal at the cathode and chlorine gas at the anode. Therefore, the products of the electrolysis are Mg(l) and Cl2(g).

Question 14

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the cathode of this cell?

Accepted Answer

According to the electrolysis reaction shown in the figure, Al³⁺(l) is being reduced at the cathode. This means that it is gaining electrons and getting reduced to its elemental form, Al(l). Therefore, the correct choice is C.

Question 15

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the anode of this cell?

Accepted Answer

The answer of The figure shows the electrolysis of molten...

Question 16

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Fe(s)+ SnCl₂(aq)→

Accepted Answer

Based on the activity series, Fe is more reactive than Sn. This means that Fe can displace Sn in a single displacement reaction. The balanced equation would be Fe(s)+ SnCl2(aq)→ FeCl2(aq)+ Sn(s).

Question 17

Consider the reaction: H₃AsO₃(aq)+ BiO₃⁻(aq)→ H₃AsO₄(aq)+ Bi(s)When this equation is balanced in acidic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Accepted Answer

The answer of Consider the reaction: H₃AsO₃(aq)+ BiO₃⁻(aq)→ H₃AsO₄(aq)+ Bi(s)When...

Question 18

Consider the half-reaction NH⁴+(aq)→ NO³-(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

The half-reaction in acid solution is:NH4+(aq) + 2H2O(l) → NO3-(aq) + 8H+(aq) + 8e-The coefficient for water is 2, and the number of electrons transferred is 8.

Question 19

Consider the half-reaction NO³−(aq)→ 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

The balanced half-reaction in acid solution is $ \text{NO}_3^- + 4H^+ + 3e^- \rightarrow \text{NO} + 2H_2O $, indicating 2 water molecules are produced and 3 electrons are transferred.

Question 20

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

Accepted Answer

At the cathode, Na+ ions are reduced, gaining an electron to become neutral Na atoms. This process is represented by the half-reaction: Na+ + e- → Na. Option C shows this reaction with the correct species involved.

Quiz 14: Oxidation-Reduction Reactions

Consider the half-reaction O₂(aq) → OH^-(aq) . When the equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

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

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

The figure shows the electrolysis of molten AlCl₃. What is the balanced equation for the reaction?

Consider the reaction: Al(s) + H₂O(l) → Al(OH) ₄⁻(aq) + H₂(g) When this equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

Consider the reaction: CrO₄²⁻(aq) + HSO₃⁻(aq) → Cr³⁺(aq) + SO₄²⁻(aq) When this equation is balanced in acidic solution, the coefficient for water will be , and the number of electrons transferred will be .

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s) + ZnCl₂(aq) →

In any electrolytic cell, the cathode is the electrode

Consider the half-reaction ClO⁻(aq) → Cl⁻(aq) . When the equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s) + HCl(aq) →

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Cu(s) + SnCl₂(aq) →

Consider the reaction: Zn(s) + NO₃⁻(aq) → NH₃(aq) + Zn(OH) ₄²⁻(aq) When this equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

The products of the electrolysis of molten magnesium chloride are

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the cathode of this cell?

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the anode of this cell?

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Fe(s) + SnCl₂(aq) →

Consider the reaction: H₃AsO₃(aq) + BiO₃⁻(aq) → H₃AsO₄(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be , and the number of electrons transferred will be .

Consider the half-reaction NH⁴+(aq) → NO³-(aq) . When the equation is balanced in acid solution, the coefficient for water will be , and the number of electrons transferred will be .

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

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

Quiz 14: Oxidation-Reduction Reactions

Consider the half-reaction O2(aq) → OH-(aq) . When the equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

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

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

The figure shows the electrolysis of molten AlCl3. What is the balanced equation for the reaction?

Consider the reaction: Al(s) + H2O(l) → Al(OH) 4−(aq) + H2(g) When this equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Consider the reaction: CrO42−(aq) + HSO3−(aq) → Cr3+(aq) + SO42−(aq) When this equation is balanced in acidic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H2 < Sn < Fe < Zn < Mg Mg(s) + ZnCl2(aq) →

In any electrolytic cell, the cathode is the electrode

Consider the half-reaction ClO−(aq) → Cl−(aq) . When the equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H2 < Sn < Fe < Zn < Mg Mg(s) + HCl(aq) →

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H2 < Sn < Fe < Zn < Mg Cu(s) + SnCl2(aq) →

Consider the reaction: Zn(s) + NO3−(aq) → NH3(aq) + Zn(OH) 42−(aq) When this equation is balanced in basic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

The products of the electrolysis of molten magnesium chloride are

The figure shows the electrolysis of molten AlCl3. What reaction occurs at the cathode of this cell?

The figure shows the electrolysis of molten AlCl3. What reaction occurs at the anode of this cell?

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H2 < Sn < Fe < Zn < Mg Fe(s) + SnCl2(aq) →

Consider the reaction: H3AsO3(aq) + BiO3−(aq) → H3AsO4(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

Consider the half-reaction NH4+(aq) → NO3-(aq) . When the equation is balanced in acid solution, the coefficient for water will be ________, and the number of electrons transferred will be ________.

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

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

Consider the half-reaction O₂(aq) → OH^-(aq) . When the equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

The figure shows the electrolysis of molten AlCl₃. What is the balanced equation for the reaction?

Consider the reaction: Al(s) + H₂O(l) → Al(OH) ₄⁻(aq) + H₂(g) When this equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

Consider the reaction: CrO₄²⁻(aq) + HSO₃⁻(aq) → Cr³⁺(aq) + SO₄²⁻(aq) When this equation is balanced in acidic solution, the coefficient for water will be , and the number of electrons transferred will be .

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s) + ZnCl₂(aq) →

Consider the half-reaction ClO⁻(aq) → Cl⁻(aq) . When the equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Mg(s) + HCl(aq) →

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Cu(s) + SnCl₂(aq) →

Consider the reaction: Zn(s) + NO₃⁻(aq) → NH₃(aq) + Zn(OH) ₄²⁻(aq) When this equation is balanced in basic solution, the coefficient for water will be , and the number of electrons transferred will be .

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the cathode of this cell?

The figure shows the electrolysis of molten AlCl₃. What reaction occurs at the anode of this cell?

Given the following information about the activity series, predict whether the given reaction will occur or not. If it does occur, write a balanced equation. Cu < H₂ < Sn < Fe < Zn < Mg Fe(s) + SnCl₂(aq) →

Consider the reaction: H₃AsO₃(aq) + BiO₃⁻(aq) → H₃AsO₄(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be , and the number of electrons transferred will be .

Consider the half-reaction NH⁴+(aq) → NO³-(aq) . When the equation is balanced in acid solution, the coefficient for water will be , and the number of electrons transferred will be .

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