Redox Reactions: Crash Course Chemistry #10

All the magic that we know is in the transfer of electrons. Reduction (gaining electrons) and oxidation (the loss of electrons) combine to form Redox chemistry, which contains the majority of chemical reactions. As electrons jump from atom to atom, they carry energy with them, and that transfer of energy is what makes all life on earth possible.

**Special Thanks to Matt Young at the University of Montana (Geosciences Department, Environmental Biogeochemistry Lab) who helped with the chemical demonstrations.**

Oxidation 1:42
Reduction 1:03
Oxidation Numbers 3:29
Redox Reactions 5:59
Oxidation Reactions 6:28
Balancing Oxidation Reactions 7:18

Also thank you to the following chemistry teachers for assistance:
James Sarbinoff
Rachel Wentz
Edi González
Lucas Moore
Chris Conley
Addie Clark
Julia Rosinski

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Sodium in Water Demo – A Safer Alternative

The reaction of sodium and water can be quite vigorous and potentially dangerous if appropriate safety precautions are not followed.  The reaction is also so fast that students often have difficulty observing it.  Here’ a slower and more controlled version of the demo that will captivate your students.  It’s key ingredient is mineral oil.

 

 

Blue-Bottle Reaction

Courtesy of Amanda, Wikimedia Commons

Courtesy of Amanda Slater, Wikimedia Commons

 

««« By James Palcik

A solution is prepared containing a dye. The dye, methylene blue, is colourless in a reduced state. Upon shaking the solution, the dye is oxidized and displays a blue colour. As the solution stands undisturbed, the dye fades to colourless as it is reduced. The cycle may be repeated over and over.
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