Balancing Redox Equations

Balancing Redox Equations
Scribe Post by Juliette O. (Quarter 4)
5/7/14

Agenda

First, we checked in the homework due today, the three page Electrochemistry worksheet. We then picked up three worksheets for homework, "Forming Ionic Compounds" and "Balancing Redox Equations." Then we went over the Electrochemistry worksheet. Finally, we took notes on Balancing Redox Equations in Acid-- these notes are posted on moodle. A video going over the notes will also be posted on moodle. 

Introduction

Mrs. Friedmann apologized that the tests have not been handed back yet, however she said the grades so far are quite poor. While it is the end of the school year, Mrs. Friedmann urged us to push through and continue to put in consistent effort to hold on to our grades. She reminded us that understanding homework is invaluable for the test. She also said that there will be an opportunity to make up some points tomorrow.

Homework Check

We went over the Electrochemistry worksheet in class today. 

Remember:

• Assume oxygen is not peroxide when you see O2-- assume the oxygen has an oxidation state of -2. 
• When asked to determine oxidation states of reactants and products of a reaction, start by tallying the oxidation numbers. For instance, in 2a, the substance oxidized in S in H2S, not S-2, because S is not an ion. Just because there is a -2 oxidation state does not mean there is a -2 charge--oxidation state and charge are not the same!  
• Remember, the chemical that contains the thing that is being reduced is the oxidizing agent.
• In 2d, remember that if there are 3 reactants on one side, you can identify what substance is being oxidized/reduced by identifying the oxidation numbers and seeing if there is a change in oxidation state. If there is a change in ox. state, the substance is oxidized or reduced. 
• Acronym to remember: LEORA GEROA 

Notes

See moodle for notes and a video going over the notes is also posted.

Link to Notes: http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/13_14_Unit_11_--_Redox/Unit_11_Notes/3_Class_Notes_5.7.14.pdf 

Link to Video: http://vimeo.com/94433376

Homework

• 2 worksheets: Forming Ionic Compounds and Balancing Redox Equations (#1 and 3 in notes) Link: http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/13_14_Unit_11_--_Redox/Unit_11_Handouts/5.7_Balancing_Redox_HW_1.pdf
• 4 Webassigns have been opened that are due over the course of the unit, the first due next week. Read ahead and use the text to finish the web assigns. W.A. due dates: May 13, 14, 19, 20