Teacher resources and professional development across the curriculum

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Reactions in Chemistry
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Sub Image2:Macro to Micro Structures
         
 
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1) Atoms and Molecules2) Macro to Micro Structures 3) Energetics and Dynamics 4) Theory and Practice in Chemical Systems 5) Chemical Design 6) The Chemistry of Life 7) Chemistry and the Environment 8) Chemistry at the Interface
 

[Channel-talkchemistry] Reactions in chemistry workshop #2 post 2

From: Joe Lannan <jlannan@esu3.org>
Date: Thu Oct 21 2004 - 07:47:16 EDT

Using macro demonstration to describe micro events can be very useful. ³
You can see a lot just by watching² is an excellent concept. Some of the
macro analogies that I thought where excellent where comparing an electron
microscope to one of the multiple pins toy. The one that you can leave an
impression of various objects. Other activities I use is a ³black box² to
show how indirect observation can lead to an understanding of something that
can not be observed directly like the atom or using a ³cheese candle² with a
slivered almond as the wick. By lighting the almond it looks like a candle.
I have the students tell me what they see vs. what they observe. I eat the
³candle at the end after I blow it out. Using water and isopropyl to
introduce solubility was very useful as presented by the video. Comparing
both to how each felt when placed on skin was a good comparison which lead
to similarities and differences. I also thought some of the role playing as
presented in the video did a good job having the students present their
ideas to each other.
Lastly I completed the Beers Law activity to show the relationship between
absorbance vs. concentration. The graphed data show a direct relationship
with the y intercept at zero as expected. I did run into a problem
calculating absorbance but solved it by determining the % transmitted (T) by
dividing the intensity at each concentration by the intensity of the blank.
I then calculated A= -log 10 ( T ).

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Received on Thu Oct 21 09:44:33 2004

 
 

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