Teacher resources and professional development across the curriculum

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Sub Image2:Macro to Micro Structures
         
 
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1) Atoms and Molecules2) Macro to Micro Structures 3) Energetics and Dynamics 4) Theory and Practice in Chemical Systems 5) Chemical Design 6) The Chemistry of Life 7) Chemistry and the Environment 8) Chemistry at the Interface
 
From: Ronald Jensen (rjensen@psdschools.org)
Date: Thu Aug 19 2004 - 21:48:28 EDT

  • Next message: Loretta Ekoniak: "[Channel-talkchemistry] oops!"

    The calcium carbonate and HCl mix releases carbon dioxide bubbles, not
    oxygen. The raisin demo also works with a clear carbonated beverage like
    Sprite. It makes it safer for younger kids to each observe their own
    system if you use the pop instead of the acid.

    Another first day attention getter that I like to use is a "flaming soap
    bubble" demonstration. Put water and dish soap in a bowl. Hook a rubber
    hose to a gas jet with a small funnel at the other end. Dip the funnel,
    and blow a bubble filled with methane from the gas jet. Gently shake the
    funnel to release the bubble. Use a gas grill butane lighter to ignite
    the bubble into a cool fireball. This takes a bit of practice. If you
    blow the bubbles too big, they rise so fast you won't get them lit. Also
    be careful not to be near objects hanging from the ceiling or to a
    sprinkler valve. I've done this one for years, but you may want to clear
    it with your dept. head, principal or risk manager before you give it a
    try.
    Ron

    > The mothball demo is a good observation demo. I take a LARGE graduated
    > cylinder (500-1000mL) and put a layer of Ca CO2 (sorry...I think I said
    > CaCl2 originally) in the bottom. add water to a 3-4 inches from the
    > top. then add some small mothballs ( I've also done this with
    > raisins!) Add some HCl and as it mixes the calcioum carbonate and
    > hydrochloric will react to release Oxygen. The bubbles will accumulate
    > on the mothballs or raisins and they will rise up to the top of the
    > cylinder where the bubbles will break and the mothballs or raisins will
    > fall back to the bottom and start over! I usually add some food color
    > to the water just for some interest. A good demo to get the idea of
    > observation vs inference across!
    >
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