Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN: 9780078746376
Author: Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher: Glencoe/McGraw-Hill School Pub Co
Question
Book Icon
Chapter 20.3, Problem 25SSC
Interpretation Introduction

Interpretation:

In light of Hall-Heroult process, the significance of aluminum recycling is to be explained.

Concept introduction:

Electrochemistry is study of relation between electrical energy and chemical changes that takes place in redox reaction. There are three main aspects of electrochemistry branch, those are:

  1. Electrolysis
  2. Electrochemical cell
  3. Electrolytic conduction.

Electrolysis is a process in which decomposition of electrolyte occurs on flow of electricity through its aqueous solution or molten state. The instrument employed to carry out electrolysis is electrolytic cell. Example of electrolytic cell is when a secondary battery is recharged.

Expert Solution & Answer
Check Mark

Answer to Problem 25SSC

In Hall-Heroult process, Al is obtained by electrolysis of Al2O3. This process employs large amount of electrical energy for electrolysis of Al2O3, therefore, recycling of aluminum becomes necessary. Recycled Al has already undergone electrolysis therefore for making it again fit for usage requires only that much amount of heat which can melt it in the furnace.

Explanation of Solution

In Hall-Heroult process, Al is obtained by electrolysis of Al2O3. In this process, cathode is graphite that surrounds the electrolytic cell and a graphite rod immersed in molten solution of Al2O3 dissolved at 1000°C in synthetic cryolite act as anode.

The half cell reactions that occur at anode and cathode respectively are as follows:

Al3+(l)+3eAl(l)2O2(aq)O2(g)+4e

Al3+ get reduced at anode and O2 gets oxidized at cathode into O2 which react with carbon of anode liberate CO2.

C(s)+O2(g)CO2(g)

Hall-Heroults’ process employs large amount of electrical energy for electrolysis of Al2O3, therefore, recycling of aluminum becomes necessary. Recycled Al has already undergone electrolysis therefore for making it again fit for usage requires only that much amount of heat which can melt it in the furnace.

Conclusion

In Hall-Heroult process, Al is obtained by electrolysis of Al2O3. This process employs large amount of electrical energy for electrolysis of Al2O3, therefore, recycling of aluminum becomes necessary. Recycled Al has already undergone electrolysis therefore for making it again fit for usage requires only that much amount of heat which can melt it in the furnace.

Chapter 20 Solutions

Chemistry: Matter and Change

Ch. 20.1 - Prob. 11SSCCh. 20.1 - Prob. 12SSCCh. 20.1 - Prob. 13SSCCh. 20.1 - Prob. 14SSCCh. 20.2 - Prob. 15SSCCh. 20.2 - Prob. 16SSCCh. 20.2 - Prob. 17SSCCh. 20.2 - Prob. 18SSCCh. 20.2 - Prob. 19SSCCh. 20.2 - Prob. 20SSCCh. 20.2 - Prob. 21SSCCh. 20.3 - Prob. 22SSCCh. 20.3 - Prob. 23SSCCh. 20.3 - Prob. 24SSCCh. 20.3 - Prob. 25SSCCh. 20.3 - Prob. 26SSCCh. 20.3 - Prob. 27SSCCh. 20.3 - Prob. 28SSCCh. 20.3 - Prob. 29SSCCh. 20 - Prob. 30ACh. 20 - Prob. 31ACh. 20 - Prob. 32ACh. 20 - Prob. 33ACh. 20 - Prob. 34ACh. 20 - Prob. 35ACh. 20 - Prob. 36ACh. 20 - Prob. 37ACh. 20 - Prob. 38ACh. 20 - Prob. 39ACh. 20 - Prob. 40ACh. 20 - Prob. 41ACh. 20 - Prob. 42ACh. 20 - Prob. 43ACh. 20 - Prob. 44ACh. 20 - Prob. 45ACh. 20 - Prob. 46ACh. 20 - Prob. 47ACh. 20 - Prob. 48ACh. 20 - Prob. 49ACh. 20 - Prob. 50ACh. 20 - Prob. 51ACh. 20 - Prob. 52ACh. 20 - Prob. 53ACh. 20 - Prob. 54ACh. 20 - Prob. 55ACh. 20 - Prob. 56ACh. 20 - Prob. 57ACh. 20 - Prob. 58ACh. 20 - Prob. 59ACh. 20 - Prob. 60ACh. 20 - Prob. 61ACh. 20 - Prob. 62ACh. 20 - Prob. 63ACh. 20 - Prob. 64ACh. 20 - Prob. 65ACh. 20 - Prob. 66ACh. 20 - Prob. 67ACh. 20 - Prob. 68ACh. 20 - Prob. 69ACh. 20 - Prob. 70ACh. 20 - Prob. 71ACh. 20 - Prob. 72ACh. 20 - Prob. 73ACh. 20 - Prob. 74ACh. 20 - Prob. 75ACh. 20 - Prob. 76ACh. 20 - Prob. 77ACh. 20 - Prob. 78ACh. 20 - Prob. 79ACh. 20 - Prob. 80ACh. 20 - Prob. 81ACh. 20 - Prob. 82ACh. 20 - Prob. 83ACh. 20 - Prob. 84ACh. 20 - Prob. 85ACh. 20 - Prob. 86ACh. 20 - Prob. 87ACh. 20 - Prob. 88ACh. 20 - Prob. 89ACh. 20 - Prob. 90ACh. 20 - Prob. 91ACh. 20 - Prob. 92ACh. 20 - Prob. 93ACh. 20 - Prob. 94ACh. 20 - Prob. 95ACh. 20 - Prob. 96ACh. 20 - Prob. 97ACh. 20 - Prob. 98ACh. 20 - Prob. 1STPCh. 20 - Prob. 2STPCh. 20 - Prob. 3STPCh. 20 - Prob. 4STPCh. 20 - Prob. 5STPCh. 20 - Prob. 6STPCh. 20 - Prob. 7STPCh. 20 - Prob. 8STPCh. 20 - Prob. 9STPCh. 20 - Prob. 10STPCh. 20 - Prob. 11STPCh. 20 - Prob. 12STPCh. 20 - Prob. 13STPCh. 20 - Prob. 14STPCh. 20 - Prob. 15STP
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Text book image
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Text book image
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Text book image
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Text book image
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY