   Chapter 19, Problem 7PS

Chapter
Section
Textbook Problem

A voltaic cell is constructed using the reaction of chromium metal and iron(II) ions.2 Cr(s) + 3 Fe2+(aq) → 2 Cr3+(aq) + 3 Fe(s)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 ________.

Interpretation Introduction

Interpretation:

The following sentences have to be completed.

A voltaic cell is constructed using the reaction of chromium metal and iron (II)ions.

2Cr(s) + 3Fe2+(aq) 2Cr3+(aq) + 3Fe(s)

Electrons in the external circuit flow from the ____ electrode to the ____electrode. Negative ions move via 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

Explanation

The given reaction is as follows.

2Cr(s) + 3Fe2+(aq) 2Cr3+(aq) + 3Fe(s)

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

From the given reaction, Cr atom increases their oxidation state 0 to +3.Therefore, it is an oxidation reaction and occurs at anode.

Fe atom reduces their oxidation state +2 to 0. Therefore, it is a reduction reaction occurs at cathode

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