I made ScienceFix.com to share my favorite demos that I do in my middle school science classes.  

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  • Something Funny Happened on the Way to the Moon
    Something Funny Happened on the Way to the Moon
    by Sara Howard
  • NOVA - Origins
    NOVA - Origins
    starring Neil Degrasse Tyson
  • Human Body: Pushing the Limits
    Human Body: Pushing the Limits
    starring Bray Poor

Video Demo: Polyurethane Fun

System A and System B monomers are mixed and polyurethane foam, a polymer, is produced.  You can see the dramatic results in a clear cup, or a little more weird, in a latex glove.


Video Demo: Balloon Suck

This is a different version of the old egg suck into a milk bottle demo.  I got this idea from a Steve Spangler demonstration in which he uses a water balloon instead of and egg.  Basically a piece of burning paper is placed into a flask and then a water balloon sits on top.  The oxygen gets used up during the reaction, creating a lower pressure inside the flask than outside.  The balloon gets pushed in as a result.


Video Demo: Flaming Gummy Worm

I usually do this demo with a Gummy bear, but all I had was Gummy worms, so that's what I used.  Sucrose has a lot of energy stored in the bonds that hold the carbon, hydrogen and oxygen atoms together.  With a little bit of activation energy (melting the potassium chlorate) and a large supply of oxygen gas, (supplied by the potassium chlorate) that energy gets released in the form of light and heat energy (exothermic).  


Video Demo: Fire Hand

This is one of my favorite demos with students.  Students get to hold methane bubbles in their hand and then experience the exothermic reaction when it reacts with oxygen in the air.  The look on their faces is pure amazement. 


Video Demo: Activation Energy

Energy is needed to start a chemical reaction.  Unsurprisingly this is called activation energy.  The video above shows the activation needed to make red phosphorus react with oxygen in the air.  

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