Chapter 20.1, Problem 2SP

(a)

Interpretation Introduction

Interpretation: Whether the given reaction, $\text{Li}\to {\text{Li}}^{+}+e^{-}$ is oxidation or reduction is to be identified.

Concept Introduction: The reaction in which oxidation and reduction take place simultaneously is a redox reaction. The process that involves the loss of electrons in a chemical reaction is referred to as oxidation. And the process that involves the gain of electrons in a chemical reaction is referred to as the reduction.

Answer to Problem 2SP

The reaction, $\text{Li}\to {\text{Li}}^{+}+e^{-}$ involves the oxidation process.

Explanation of Solution

The chemical reaction that involves a loss of electrons is identified to undergo oxidation while the one which involves the gain of electrons is reduced. The given reaction,

  $\text{Li}\to {\text{Li}}^{+}+e^{-}$

It is visible that the reaction involves the loss of electrons from the element, lithium. So, it is an oxidation reaction.

(b)

Interpretation Introduction

Interpretation: Whether the given reaction, $\text{2I}\to {\text{I}}_2+2e^{-}$ is oxidation or reduction is to be identified.

Concept Introduction: The reaction in which oxidation and reduction take place simultaneously is a redox reaction. The process that involves the loss of electrons in a chemical reaction is referred to as oxidation. And the process that involves the gain of electrons in a chemical reaction is referred to as the reduction.

Answer to Problem 2SP

The reaction $\text{2I}\to {\text{I}}_2+2e^{-}$ involves an oxidation process.

Explanation of Solution

The chemical reaction that involves a loss of electrons is identified to undergo oxidation while the one which involves a gain of electrons is reduction. The given reaction,

  $\text{2I}\to {\text{I}}_2+2e^{-}$

It is visible that iodide ions, ${\text{I}}^{-}$ lose electrons thereby forming iodine, ${\text{I}}_2$ . As it involves the loss of electrons it is an oxidation reaction.

(c)

Interpretation Introduction

Interpretation: Whether the given reaction, ${\text{Zn}}_2+2e^{-}\to \text{Zn}$ is oxidation or reduction is to be identified.

Concept Introduction: The reaction in which oxidation and reduction take place simultaneously is a redox reaction. The process that involves the loss of electrons in a chemical reaction is referred to as oxidation. And the process that involves the gain of electrons in a chemical reaction is referred to as the reduction.

Answer to Problem 2SP

The reaction, ${\text{Zn}}_2+2e^{-}\to \text{Zn}$ involves the reduction process.

Explanation of Solution

The chemical reaction that involves a loss of electrons is identified to undergo oxidation while the one which involves a gain of electrons is reduction. The given reaction,

  ${\text{Zn}}_2+2e^{-}\to \text{Zn}$

It involves the gain of electrons by the zinc ions, and ${\text{Zn}}^{2+}$ results in the formation of $\text{Zn}$ . So, it is an example of a reduction reaction.

(d)

Interpretation Introduction

Interpretation: Whether the given reaction, ${\text{Br}}_2+2e^{-}\to {\text{2Br}}^{-}$ is oxidation or reduction is to be identified.

Concept Introduction: The reaction in which oxidation and reduction take place simultaneously is a redox reaction. The process that involves the loss of electrons in a chemical reaction is referred to as oxidation. And the process that involves the gain of electrons in a chemical reaction is referred to as the reduction.

Answer to Problem 2SP

The reaction ${\text{Br}}_2+2e^{-}\to {\text{2Br}}^{-}$ involves a reduction process.

Explanation of Solution

The chemical reaction that involves a loss of electrons is identified to undergo oxidation while the one which involves the gain of electrons is reduced. The given reaction,

  ${\text{Br}}_2+2e^{-}\to {\text{2Br}}^{-}$

It involves the gain of electrons by bromine, ${\text{Br}}_2$ thus forming bromide ions, ${\text{Br}}^{-}$ . As it involves a gain of electrons, it is an example of a reduction reaction.