Date: Thu Feb 06 2003 - 18:52:30 EST
That's a great idea. Thanks so much.
----- Original Message -----
From: Steve Gustafson <email@example.com>
Date: Thursday, February 6, 2003 1:28 pm
Subject: Re: [Channel-talkchemistry] program 2
> Suggestion for the ziplock bag lab: I have my students put the liquids
> together in a small regular sandwich bag which they then stuff
> into the
> zoplock bag without spilling. Then they invert the whole thing and
> squeezeout the liquid from the inside bag. You don't need quick
> reactions and if
> the ziplock doesn't work just right, it doesn't matter.
> Steve G.
> on 2/3/03 9:19 PM, firstname.lastname@example.org at email@example.com
> > We use a different activity to start discussions about chemical
> reactions that
> > has worked well for us. The students do a quick experiment
> where they combine
> > water, bromthymol blue, sodium bicarbonate and calcium chloride.
> They make
> > observations of all four substances before they begin. They
> they combine the
> > two solids in a plastic ziplock baggie, and make observations.
> They combine
> > the two liquids in a beaker, and make observations, and finally
> add the
> > liquids to the solids in the ziplock and quickly seal it. Heat
> is generated,
> > gas is produced as well as a great color change from blue to
> yellow. After
> > making all their observations, students are then told to
> determine exactly
> > which combination of substances produces each change they
> noticed. The kids
> > seem to like it and it really gets them talking about what is
> > Would love any suggestions.
> > Rae
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