Chapter 17, Problem 21QRT

(a)

Interpretation Introduction

Interpretation:

A balanced net ionic equation for the product-favored reaction in which the oxidation of zinc metal occurs into ${\text{Zn}}^{2+}$ ion has to be stated.

Concept Introduction:

When substances dissolved in an aqueous solution are expressed as ions, it is termed as an ionic equation.  The ionic equation must be balanced and net charge on each side must be equal.

(b)

Interpretation Introduction

Interpretation:

In the redox reaction of zinc and lead, the half-cell reactions that occur at each electrode has to be stated.  Also, the reaction at the anode and the cathode has to be identified.

Concept Introduction:

A reaction where oxidation and reduction of reactants are involved is termed as a redox reaction.  The compound that undergoes oxidation is the reducing agent and the compound being reduced is termed as an oxidizing agent.  The process of oxidation occurs at the anode, whereas the process of reduction occurs at the cathode.

(c)

Interpretation Introduction

Interpretation:

The diagram of the voltaic cell for the redox reaction of zinc and lead that indicates the direction of electron and ion flow in the cell has to be drawn.

Concept Introduction:

A voltaic cell is used to generate electric current by the movement of electrons from anode to cathode inside the cell.  The electrons are generated as a result of the redox reaction taking place inside the cell.