[Nfb-science] science experiments

[Larry D. Keeler]

If the experiment is osmosis you can do many things. My favorite is first to 
take an egg and soak it in vinegar for a couple of weeks.  Weigh it and then 
put it in water.  This gives kids a few things to learn.  First, they casn 
observe the chemical reaction of the calcium with the vinegar.  Or rather 
acetic acid.  Next, you really have in effect a large cell complete with 
organelles and membrane.  Lastly, you can then prove that water crosses cell 
membranes by putting the egg in the water.  The egg not only becomes firm 
but its weight increases.  The last thing you could do is iether put the egg 
in some anhydrous matterial and draw the water back out, thus shrinking the 
egg.  Maybe alcohol might do that.  Which could also show what happens to 
cells when one drinks alcohol.  The sponge idea is faster but the egg thing 
is a whole lot more fun!  You can also play ball with the eggs if they stay 
in the vinegar too long!
----- Original Message ----- 
From: "Pickrell, Rebecca M (TASC)" <REBECCA.PICKRELL at tasc.com>
To: "'NFB Science and Engineering Division List'" <nfb-science at nfbnet.org>
Sent: Monday, January 28, 2013 2:08 PM
Subject: Re: [Nfb-science] science experiments


> Those toys got banned? Really? My daughter loves them!
> Please tell me we're talking about something different. I've been meaning 
> to put one in the bathtub to see how big it will get.
>
> -----Original Message-----
> From: Nfb-science [mailto:nfb-science-bounces at nfbnet.org] On Behalf Of 
> Blaine Clark
> Sent: Saturday, January 26, 2013 3:14 PM
> Subject: Re: [Nfb-science] science experiments
>
> If you can get some of those dried sponge toys that have recently been
> banned in the US because they pose a health hazard to small children who
> can swallow them, you can let your students feel them before they go
> into the water and perhaps two or more can keep their hands on them in
> water as they expand. You could even just partially immerse them so they
> could feel the portions under water versus the portions above water and
> tell how the water/air division area softens and partially expands as
> water starts to creep up. You should be able to do this with regular
> hard dried sponges too.
>
>
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