Re: pinhole compounds... pure substances

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From: NFetter@aol.com
Date: Wed Dec 25 2002 - 23:03:57 PST 

From: NFetter@aol.com
Message-ID: <40.293e7d43.2b3c03dd@aol.com>
Date: Thu, 26 Dec 2002 02:03:57 EST
Subject: Re: pinhole compounds... pure substances

Hi,
The dipole attraction between water and ethanol is not considered to be a
chemical bond because the two componds can be separated by simple
distillation. The hydrogen bond between water and ammonia can also be
disrupted by simple distillation. So these attractions are not considered
chemical bonds. Like many things in science there is a grey area where simple
definitions break down. For example, the strands of DNA are held together by
hydrogen bonds, but the are so many of them, that the molecule is stable
(fortunately) for most of our lives. Yet it can unzipped temporarily to form
RNA.
Neil

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