Liquid Nitrogen - Speed of Chemical Reactions



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 Code Number :   4A40.45 

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

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Condition :   Excellent  
Principle :    Chemical reactivity at low temperatures.
Area of Study :  Heat & Fluids  
Equipment :   Liquid Nitrogen in Dewar, Styrofoam transfer cup, 400 ml beaker, 9 volt battery with snap-on LED unit.

 

Procedure :   Snap the LED unit onto the 9 volt battery.  Place this into the clear beaker and fill the beaker with liquid nitrogen.  As the battery cools the LED will become dimmer and will go out completely when the battery reaches liquid nitrogen temperature.  The chemical reaction has now slowed to an extent where it is no longer able to light the LED.  Remove the battery and LED unit from the liquid nitrogen and allow them to warm up.  As the battery warms the LED will start to glow.  The warmer the battery gets the brighter the LED will shine.

 

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   References
Janice VanCleave,  "Speedy", Janice VanCleave's 203 Ice, Freezing, Frosty, Cool & Wild  Experiments , p. 57.


Mail Questions and Comments to:  Dale Stille