Chapter 20, Problem 35A

(a)

Interpretation Introduction

Interpretation: Whether a given reaction, $Al\to A{l}^{3+}+3e^{-}$ is oxidation or reduction is to be identified.

Concept Introduction: The reaction that involves the loss of electrons is oxidation. While that involves the gain of electrons is reduction.

Answer to Problem 35A

The given reaction, $Al\to A{l}^{3+}+3e^{-}$ is oxidation.

Explanation of Solution

The given reaction,

  $Al\to A{l}^{3+}+3e^{-}$

It involves the removal of electrons from Al to form $A{l}^{3+}$ . So, it is an example of an oxidation reaction.

(b)

Interpretation Introduction

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

Concept Introduction: The reaction that involves the loss of electrons is oxidation. While that involves the gain of electrons is reduction.

Answer to Problem 35A

The given reaction, $2C{l}^{-}\to C{l}_2+2e^{-}$ is oxidation.

Explanation of Solution

The given reaction,

  $2C{l}^{-}\to C{l}_2+2e^{-}$

It involves the removal of electrons from $C{l}^{-}$ to form $C{l}_2$ . So, it is an example of an oxidation reaction.

(c)

Interpretation Introduction

Interpretation: To identify whether a given reaction, $S_2{}^{-}\to S+2e^{-}$ is oxidation or reduction.

Concept Introduction: The reaction that involves the loss of electrons is oxidation. While that involves the gain of electrons is reduction.

Answer to Problem 35A

The given reaction, $S_2{}^{-}\to S+2e^{-}$ is oxidation.

Explanation of Solution

The given reaction,

  $S_2{}^{-}\to S+2e^{-}$

It involves the removal of electrons from $S_2{}^{-}$ to form S. So, it is an example of an oxidation reaction.

(d)

Interpretation Introduction

Interpretation: To identify whether a given reaction, $Sr\to S{r}^{2+}+2e^{-}$ is oxidation or reduction.

Concept Introduction: The reaction that involves the loss of electrons is oxidation. While that involves the gain of electrons is reduction.

Answer to Problem 35A

The given reaction, $Sr\to S{r}^{2+}+2e^{-}$ is oxidation.

Explanation of Solution

The given reaction,

  $Sr\to S{r}^{2+}+2e^{-}$

It involves the removal of electrons from Sr to form $S{r}^{2+}$ . So, it is an example of an oxidation reaction.