Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

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Reactions in Chemistry
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Sub Image2:Macro to Micro Structures
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
From: Cindy Lee Duckert (duckert@focol.org)
Date: Fri Feb 21 2003 - 10:41:04 EST

Lisa Morine's chemistry of cooking is similar to an activity I do with
groups. I start with the following untitled recipe I found long ago on
the internet. (Unfortunately, I do not have its original source and I did
correct some errors I found in it.) We talk about how all aspects of life
have specialized vocabulary - sports, cooking, chemistry among them. Then
we translate the following and determine its vocabulary base (they usually
need to be led to the engineering aspect.) For me, this is both an intro
duction to lab notebooks and technical writing as well as a way to relate
chemistry to a more familiar part of life. I hope the subscripts and
superscripts transfer well - my mailer program does not accept them easily.

(chocolate chip cookie recipe)
1.) 532.35 cm3 gluten
2.) 4.9 cm3 NaHCO3
3.) 4.9 cm3 refined halite
4.) 236.6 cm3 partially hydrogenated tallow triglyceride
5.) 177.45 cm3 crystalline C12H22O11
6.) 177.45 cm3 unrefined C12H22O11
7.) 4.9 cm3 methyl ether of protocatechuic aldehyde
8.) 2 calcium carbonate-encapsulated avian albumen-coated protein
9.) 473.2 cm3 theobroma cacao
10.) 236.6 cm3 de-encapsulated legume meats (sieve size #10)

To a 2 liter jacketed round reactor vessel (Reactor #1) with an overall
heat transfer coefficient of about 100 BTU/ft2-hr, add ingredients 1, 2 and
3 with constant agitation. In a second 2 liter reactor vessel with a
radial flow impeller operating at 100 rpm, add ingredients 4, 5, 6 and 7
until the mixture is homogenous. To Reactor #2, add ingredients 8,
followed by three equal volumes of the homogenous mixture in reactor
#1. Agitate. Additionally, add ingredients 9 and 10 slowly, with constant
agitation. Care must be taken at this point in the reaction to control any
temperature rise that may be the result of an exothermic reaction.

Using a screw extrude attached to a #4 nodulizer, place the mixture
piece-meal on a 316SS sheet (300 x 600 mm.) Heat in a 460 degree K oven
for a period of time that is in agreement with Frank & Johnston's first
order rate expression (see JACOS, 21,55,) or until golden brown.

Once the reaction is complete, place the sheet on a 25 degree C
heat-transfer table, allowing the product to come to equilibrium.
revisions CLD, 2001

  I am a homeschooler in Neenah WI. My normal class size has been two,
this year down to one as my eldest is off to college. Our glassware is in
the same cabinet as the wine galsses, etc. - but woe to him who tries to
use science equipment for food or vice versa! I also do workshops and one
day activities with groups of homeschoolers, student and adult. It is
quite fascinating listening & watching the safety, cost and
breakage issues in labs in school settings. Most suppliers will not sell
chemicals to homeschoolers - we might be drug dealers!- so the idea that
maing aspirin iis not a usual part of 10 grade chem classes is quite an eye

I have the advantage of knowing my usual two students very, very well and
because we have been doing chemistry throughout their entire
educations. We have the time to do things from an inquiry-based approach.
I am relishing the course as I get to reap the experience of teachers who
teach the same subject more than once. I, too, do wish I had a group
locally with whom to discuss the course.

Cindy Lee Duckert, duckert@focol.org


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