Re: pinhole Limiting Reactant Demo

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From: Gary Horne (gary@horne.cc)
Date: Fri Jan 10 2003 - 10:15:16 PST 

Date: Fri, 10 Jan 2003 10:15:16 -0800
Subject: Re: pinhole Limiting Reactant Demo
From: Gary Horne <gary@horne.cc>
Message-Id: <786B5BF7-24C7-11D7-A0DC-000393C56758@horne.cc>

I've got a question:

  It the reaction exothermic or endothermic. (I haven't done the
experiment in quite a while.)

g

On Friday, January 10, 2003, at 08:00 AM, Paul Doherty wrote:

> Hi Raleigh
>
> Here's a clue.
>
> Balloon rubber is permeable to CO2.
>
> Paul D
>
>> It's a pretty common experiment to put baking soda in
>> a balloon and an acid, usually vinegar in elementary
>> school, in a plastic soda bottle. We've all seen how
>> the balloon filled with Carbon dioxide seems to
>> deflate over time much faster than a balloon filled
>> with air too.
>> Accidently lost track of one of these experiments as
>> it fell behind a box and was surprised to find, after
>> about a week that the balloon had been pulled into the
>> plastic bottle and the bottle had crushed flat (no,
>> the box did not fall on the bottle!). The crushing of
>> the plastic container isn't gonna happen if you use a
>> glass flask to do this. It was really odd as I
>> couldn't figure out why the balloon and bottle would
>> crush. Talked to "It's more complicated than that" and
>> he set me off on a quest to figure it out...guided
>> inquiry or something I guess. It always amazes me to
>> see it and I leave at least one of my experiments out
>> until it pulls the balloon into the bottle to vex and
>> concern my students.
>>
>> With firm handshake,
>> Raleigh
>>
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