Re: pinhole physcial change & why CO2 douses flames

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From: Burt Kessler (bcomet@pacbell.net)
Date: Sat Apr 03 2004 - 09:05:04 PST 

Message-Id: <0CEC98EF-8591-11D8-9AEB-000A95AFE37C@pacbell.net>
From: Burt Kessler <bcomet@pacbell.net>
Subject: Re: pinhole physcial change & why CO2 douses flames
Date: Sat, 3 Apr 2004 09:05:04 -0800

On Apr 2, 2004, at 4:23 PM, Treena Joi wrote:

> From that, I did the chemistry in a bag thing and the teacher notes say
> that calcium chloride and water evolve heat, yes, which is exothermic,
> going on to say it is only a physical change ...
>
CaCl2 + H2O = CaOH + HCl

among other reactions in that ziplok bag

Burt Kessler

"Science is nothing more than learning how to communicate with nature
in such a manner that it will talk back."

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