electrochemistry -- balancing redox reactions

Continuing with the topics of Electrochemistry, today I'm going to focus on balancing redox reactions.

Objectives:

1.  Compute the oxidation number of an atom of any element in a pure substance.

2. Apply the half-reaction method to balance redox equations.

I posted information about assigning oxidation numbers in my previous post -- here's a simple list of basics to memorize for your reference:

Remember, pure elements have an oxidation state of 0 !
Worksheets with practice assigning oxidation numbers are in my 5/4/14 post as well.

It is important to balance the charges exchanged when balancing redox reactions -- one approach is to examine the oxidation and reduction separately, called the half-reaction method.

Here is a simple introductory example:

This next video has a list of steps and goes through a more difficult example:

Here's is a written list of steps and an example (again, a little more difficult):

http://homepage.smc.edu/merlic_jennifer/Chem11/Handouts/Half_Reaction_Method.pdf

This page also has a list of steps on how to approach a redox half-reaction problem:

http://faculty.scottsdalecc.edu/borick/files/2011/05/Balancing-Redox-Reactions1.pdf

Here's a series of links with background notes, a worksheet, and answers:

http://chemistryfouryou.weebly.com/uploads/8/9/2/7/8927138/9.2_balancing_redox.pdf

http://library.vcc.ca/learningcentre/pdf/vcclc/Chem0993-BalancingRedoxReactions2.pdf

This link has several examples but no answers.  :-(
http://www.fieldlocalschools.org/userfiles/1138/Classes/7788/Redox%20Reactions%20Worksheets.pdf

Because I'm focusing on Introductory Chemistry, I only presenting the half-reaction method for balancing redox reactions.

Check out my lab book "Chemistry on a Budget" at amazon.com:
http://www.amazon.com/Chemistry-Budget-Marjorie-R-Heesemann/dp/0578129159/ref=sr_1_1?s=books&ie=UTF8&qid=1389410170&sr=1-1&keywords=chemistry+on+a+budget

Each lab is presented with two possible report formats -- both labs use the same procedure page but each has a different conclusion page -- one with 10 questions to be answered as a conclusion, the other with a full laboratory report required.  This gives the teacher the option of what type of report is desired!  

*I'd love to hear from you!  Your feedback would really help me to focus on your needs!  There should be a "Contact" form below, or click on the "Contact" tab on the top right of this page.  

Have a good end of the week!