1. Module 3

1.22. Page 4

Lesson 4

Module 3—Electrochemical Reactions

Read

 

To this point you have used oxidation numbers to identify oxidized and reduced species. Read the text and work through the “Sample problems” and “Communication examples” on pages 589–593 in the textbook to see how using oxidation numbers can enable you to balance entire redox reactions.

 

Mastering this method will add to your skills and may save you time in completing problems in the future. You may recall that, in Lesson 3, the method to balance half-reactions and to write a net ionic equation had many steps. You may find this method preferable as an alternative or as a means to check work in which you used the other methods of writing reactions.

 

Self-Check

 

SC 4. Complete “Practice” question 12 on page 593 of the textbook.

 

Check your work.
Self-Check Answers

 

Contact your teacher if your answers vary significantly from the answers provided here.

 

SC 4.

 

Practice 12.

 

a.   

  

                 

b.

 

c.

 

After balancing a net ionic equation using oxidation numbers, you should check to see if the charge on each side balances.