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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 17 Dec 2003 14:52:48 -0500
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text/plain
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text/plain (76 lines)
:)  No, a second order is not necessarily the "square" of the first order, since a first order would be first order in A, while a second order reaction could be second order in A (yes, A squared) or first order in A and first order in B, in which case you definitely would not call it squared.
Bev

-----Original Message-----
From: Brooks,Bill [mailto:[log in to unmask]]
Sent: December 17, 2003 2:35 PM
To: 'TechNet E-Mail Forum.'; Bev Christian
Subject: RE: [TN] Need a chemist or chemical engineer to answer


Hmm.. I'm not either one... but I did try to understand your question... 

In English medieval alchemy, something that had sublimed had been converted
by heat from a solid directly into a vapour, considered to be an ethereal or
higher form of nature. As it happens, a number of substances important to
alchemy sublime, including sulphur, white arsenic, amber and camphor; the
device in which this was done was a sublimatory. Of course, such substances
condensed again to solids when they cooled, and the word was commonly
applied to the whole process of heating, vaporisation and resolidification,
but the change from solid to gas was always primary.

I found an explanation of Kinetics 1st and 2nd order at
http://www.chemistrygeek.com/c2c13.htm

The second being the square of the first? 

So in layman's terms... I still need more info to understand the question...
but I sort of understand some of the terms... 

Maybe you can elaborate and help me understand the reason for the question
and its implications to PCB manufacturing and Design?


Bill Brooks 
PCB Design Engineer , C.I.D., C.I.I.


-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]] 
Sent: Wednesday, December 17, 2003 10:57 AM
To: [log in to unmask]
Subject: [TN] Need a chemist or chemical engineer to answer

Technetters,
It has been almost 30 years since I took kinetics.  I have dug out my old
text books, but they only help so much. I'm a preparative inorganic chemist
by training. My question is the following:  If a single compound sublimes,
without decomposition, would you expect the kinetics to be zero or first
order?  Thanks.
Bev Christian
Research in Motion

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