Re: pinhole chemical change or physical change?

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From: NFetter@aol.com
Date: Thu Oct 23 2003 - 12:31:38 PDT 

From: NFetter@aol.com
Message-ID: <f9.32c85119.2cc9869a@aol.com>
Date: Thu, 23 Oct 2003 15:31:38 EDT
Subject: Re: pinhole chemical change or physical change?

Hi Andy,
When concrete cures a chemical change occurs. Water is involved in a complex
reaction with the chemicals that make up Portland cement.
Dissolving salt in water is usually considered a physical change, although
again water is involved in breaking up the sodium and chloride ions in the salt
lattice.
Neil Fetter

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