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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 14, Problem 14E
Textbook Problem
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Use chemical equations to describe a Leclanché dry cell or inexpensive battery. How do alkaline batteries differ?

Interpretation Introduction

Interpretation:

The Leclanche dry cell or inexpensive battery is to be described by using a chemical equation. An alkaline battery is different from the Leclanche dry cell, is to discussed.

Concept introduction:

Oxidation is the addition of an electronegative element or the removal of an electropositive element in a chemical reaction.

Reduction is the addition of an electropositive element or the removal of an electronegative element in a chemical reaction.

Leclanche dry cell, is produced in great quantities and is widely used in devices such as flashlights and portable radios.

The Leclanche dry cell or flashlight battery is called ‘dry’ because there is no liquid present.

Explanation of Solution

The Leclanche dry cell or flashlight battery is a single electrochemical cell. It is made up of a zinc anode and a carbon rod cathode. MnO2 is present in the Leclanche dry cell. MnO2 is being reduced.

The redox reaction in the Leclanche dry cell is as follows.

MnO2 half-cell reaction will occur as reduction at the cathode.

2MnO2+2e+H2OMn2O3+OH

Zn half-cell reaction will occur as oxidation at the anode.

Zn(s)Zn2+(aq)+2e

Adding all the reaction gives the overall reaction as follows:

2MnO2(s)+ H2O(l

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Chapter 14 Solutions

Chemistry In Focus
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