   Chapter 19, Problem 8PS

Chapter
Section
Textbook Problem

A voltaic cell is constructed using the reactionMg(s) + 2H+(aq) → Mg2+(aq) + H2(g) (a) Write equations for the oxidation and reduction half-reactions. (b) Which half-reaction occurs in the anode compartment, and which occurs in the cathode compartment? (c) Complete the following sentences: Electrons in the external circuit flow from the ________ electrode to the ______ electrode. Negative ions move in the salt bridge from the ______ half-cell to the ______ half-cell. The half-reaction at the anode is ____, and that at the cathode is _____.

a.

Interpretation Introduction

Interpretation:

The equations for the oxidation and reduction half reactions have to be determined.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

Explanation

In the voltaic cell has two half cells. In this cell oxidation occurs at anode and reduction occurs at cathode.

From the given reaction, Mg atom increases their oxidation state 0 to +2.Therefore, it is an oxidation reaction and occurs at anode.

H atom reduces their oxidation state +1 to 0.Therefore, it is a reduction reaction occurs at cathode

Let’s write the two half cell reactions.

Oxidation:  Mg(s)�

b)

Interpretation Introduction

Interpretation:

The half –reaction occurs in the anode compartment and which occurs in the cathode compartment has to be given.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

c)

Interpretation Introduction

Interpretation:

The sentences given below have to be completed.

Electrons in the external circuit flow from the ------ electrode to the ______ electrode. Negative ions move in the salt bridge from the ______ half –cell to the _____half –cell. The half reaction at the anode is ______, and that at the cathode is ______.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

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