Question 1

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell,use the partial activity series included to select the half-reaction represented by the RIGHT side of the cell. Zn $\rightarrow$Zn²⁺ + 2e^- Fe $\rightarrow$Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

The answer of If the accompanying drawing of an electrochemical...

Question 2

Given the accompanying partial activity series,which element(s)will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Accepted Answer

The elements that will react with acid are those that are above hydrogen in the activity series. In this case, iron, nickel, and zinc are all above hydrogen and therefore will react with acid. Copper and silver, on the other hand, are below hydrogen in the activity series and will not react with acid. The presence of sulfur in the equations is not relevant to the question of whether the element will react with acid.

Question 3

Consider an electrochemical cell consisting of zinc and cobalt half-cells.Use the partial activity series included to determine the direction in which the electrons in the wire will flow. Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

In an electrochemical cell, electrons flow from the anode to the cathode. Zinc is more reactive than cobalt, so it acts as the anode, losing electrons, while cobalt acts as the cathode, gaining electrons.

Question 4

Which example BEST represents the reaction between magnesium and hydrochloric acid?

Accepted Answer

The correct reaction between magnesium and hydrochloric acid is Mg + 2HCl → MgCl2 + H2, which matches choice A, despite the formatting errors.

Question 5

Given the accompanying partial activity series,which element(s)will NOT react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu$\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Accepted Answer

Elements that are lower in the activity series than hydrogen do not react with acids to produce hydrogen gas. Silver (Ag) is less reactive than hydrogen, so it will not react with acid.

Question 6

Which example BEST represents the reaction between copper and hydrochloric acid?

Accepted Answer

Copper does not react with hydrochloric acid because it is less reactive than hydrogen and cannot displace hydrogen from the acid.

Question 7

Consider an electrochemical cell consisting of zinc and nickel half-cells.Use the partial activity series included to determine the direction in which the electrons in the wire will flow. Zn $\rightarrow$Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

In an electrochemical cell, electrons flow from the anode to the cathode. Zinc is more reactive than nickel, meaning it more readily loses electrons (oxidation) and thus serves as the anode. Nickel, being less reactive, gains electrons (reduction) and serves as the cathode. Therefore, electrons flow from the zinc anode to the nickel cathode.

Question 8

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell,use the partial activity series included to determine the component labeled 1. Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co$\rightarrow$Co²⁺ + 2e^- Ni $\rightarrow$Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

The answer of If the accompanying drawing of an electrochemical...

Question 9

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell,use the partial activity series included to select the half-reaction represented by the LEFT side of the cell. Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$Fe²⁺ + 2e^- Co $\rightarrow$Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

The answer of If the accompanying drawing of an electrochemical...

Question 10

Which example represents the oxidation half-reaction for cobalt/cobalt(II)?

Accepted Answer

In an oxidation half-reaction, the element loses electrons. Choice A correctly shows cobalt (Co) losing two electrons to form cobalt(II) (Co^2+), which is the process of oxidation.

Question 11

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell,use the partial activity series included to describe the component labeled 2. Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

Component labeled 2 is connected to the cathode, therefore it must be a cathode itself. Since the cell is an iron-nickel cell, the cathode must be made of nickel (as stated in the partial activity series), so the best choice is D) nickel cathode.

Question 12

Which example represents the reduction half-reaction for cobalt/cobalt(II)?

Accepted Answer

The reduction half-reaction involves the gain of electrons and the formation of the reduced form of the element. In this case, cobalt(II) is the reduced form. The correct half-reaction is Co2+ + 2 e- --> Co, which is represented by choice C.

Question 13

The reduction half-reaction for the reaction of zinc with hydrochloric acid is:

Accepted Answer

The reduction half-reaction involves the gain of electrons. In the reaction of zinc with hydrochloric acid, hydrogen ions (H⁺) gain electrons to form hydrogen gas (H₂), which is represented by option D.

Question 14

What are the coefficients of the balanced equation that represents the reaction in a magnesium/aluminum electrochemical cell? Mg (s)+ Al³⁺ (aq)$\rightarrow$ Al (s)+ Mg²⁺ (aq)

Accepted Answer

The answer of What are the coefficients of the balanced...

Question 15

The oxidation half-reaction for the reaction of zinc with hydrochloric acid is:

Accepted Answer

The oxidation half-reaction involves the loss of electrons from the zinc atom, which is oxidized to Zn2+. The correct half-reaction is Zn -> Zn2+ + 2e-. Choice B is the only one that shows this half-reaction correctly.

Question 16

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell,use the partial activity series included to identify the components labeled 1,2,3,and 4 respectively. Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$Co²⁺ + 2e^- Ni $\rightarrow$Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

The answer of If the accompanying drawing of an electrochemical...

Question 17

Given the accompanying partial activity series,which element(s)can reduce copper(II)to elemental copper? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Accepted Answer

In an activity series, a metal can reduce the ions of any metal below it. Since zinc, iron, and nickel are listed above copper, they can reduce copper(II) to elemental copper.

Question 18

Using the accompanying drawing of an electrochemical cell,identify the components labeled 1,2,and 5,respectively.

Accepted Answer

1 = Salt Bridge
2 = Anode
5 = Cathode

Therefore, the correct choice is D, which lists the components in the correct order.

Question 19

Knowing that sodium and potassium react violently with water,predict which element will also react with water.

Accepted Answer

Sodium and potassium are both in the same group (Group 1) as cesium, which suggests that cesium will also react violently with water. Additionally, as you move down a group in the periodic table, the reactivity with water tends to increase, making cesium the most likely candidate for a violent reaction with water.

Question 20

Given the accompanying partial activity series,which element(s)will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu$\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Accepted Answer

Nickel will react with acid because it is above hydrogen in the activity series, indicating it can displace hydrogen ions from acid. Copper and silver are below hydrogen and will not react with acid.

Quiz 14: Oxidation-Reduction Reactions

Given the accompanying partial activity series,which element(s) will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Which example BEST represents the reaction between magnesium and hydrochloric acid?

Given the accompanying partial activity series,which element(s) will NOT react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Which example BEST represents the reaction between copper and hydrochloric acid?

Which example represents the oxidation half-reaction for cobalt/cobalt(II) ?

Which example represents the reduction half-reaction for cobalt/cobalt(II) ?

The reduction half-reaction for the reaction of zinc with hydrochloric acid is:

What are the coefficients of the balanced equation that represents the reaction in a magnesium/aluminum electrochemical cell? Mg (s) + Al³⁺ (aq) $\rightarrow$ Al (s) + Mg²⁺ (aq)

The oxidation half-reaction for the reaction of zinc with hydrochloric acid is:

Given the accompanying partial activity series,which element(s) can reduce copper(II) to elemental copper? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Using the accompanying drawing of an electrochemical cell,identify the components labeled 1,2,and 5,respectively.

Knowing that sodium and potassium react violently with water,predict which element will also react with water.

Given the accompanying partial activity series,which element(s) will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Quiz 14: Oxidation-Reduction Reactions

Given the accompanying partial activity series,which element(s) will react with acid? Zn →\rightarrow→ Zn2+ + 2e- Fe →\rightarrow→ Fe2+ + 2e- Ni →\rightarrow→ Ni2+ + 2e- H2 →\rightarrow→ 2H+ + 2e- Cu →\rightarrow→ Cu2+ + 2e- Ag →\rightarrow→ Ag+ + e-

Which example BEST represents the reaction between magnesium and hydrochloric acid?

Given the accompanying partial activity series,which element(s) will NOT react with acid? Zn →\rightarrow→ Zn2+ + 2e- Fe →\rightarrow→ Fe2+ + 2e- Ni →\rightarrow→ Ni2+ + 2e- H2 →\rightarrow→ 2H+ + 2e- Cu →\rightarrow→ Cu2+ + 2e- Ag →\rightarrow→ Ag+ + e-

Which example BEST represents the reaction between copper and hydrochloric acid?

Which example represents the oxidation half-reaction for cobalt/cobalt(II) ?

Which example represents the reduction half-reaction for cobalt/cobalt(II) ?

The reduction half-reaction for the reaction of zinc with hydrochloric acid is:

What are the coefficients of the balanced equation that represents the reaction in a magnesium/aluminum electrochemical cell? Mg (s) + Al3+ (aq) →\rightarrow→ Al (s) + Mg2+ (aq)

The oxidation half-reaction for the reaction of zinc with hydrochloric acid is:

Given the accompanying partial activity series,which element(s) can reduce copper(II) to elemental copper? Zn →\rightarrow→ Zn2+ + 2e- Fe →\rightarrow→ Fe2+ + 2e- Co →\rightarrow→ Co2+ + 2e- Ni →\rightarrow→ Ni2+ + 2e- Cu →\rightarrow→ Cu2+ + 2e-

Using the accompanying drawing of an electrochemical cell,identify the components labeled 1,2,and 5,respectively.

Knowing that sodium and potassium react violently with water,predict which element will also react with water.

Given the accompanying partial activity series,which element(s) will react with acid? Zn →\rightarrow→ Zn2+ + 2e- Fe →\rightarrow→ Fe2+ + 2e- Ni →\rightarrow→ Ni2+ + 2e- H2 →\rightarrow→ 2H+ + 2e- Cu →\rightarrow→ Cu2+ + 2e- Ag →\rightarrow→ Ag+ + e-

Given the accompanying partial activity series,which element(s) will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

Given the accompanying partial activity series,which element(s) will NOT react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-

What are the coefficients of the balanced equation that represents the reaction in a magnesium/aluminum electrochemical cell? Mg (s) + Al³⁺ (aq) $\rightarrow$ Al (s) + Mg²⁺ (aq)

Given the accompanying partial activity series,which element(s) can reduce copper(II) to elemental copper? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Co $\rightarrow$ Co²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^-

Given the accompanying partial activity series,which element(s) will react with acid? Zn $\rightarrow$ Zn²⁺ + 2e^- Fe $\rightarrow$ Fe²⁺ + 2e^- Ni $\rightarrow$ Ni²⁺ + 2e^- H₂ $\rightarrow$ 2H⁺ + 2e^- Cu $\rightarrow$ Cu²⁺ + 2e^- Ag $\rightarrow$ Ag⁺ + e^-