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Unit 2.4
Using Models
This unit shows teachers performing demonstrations
and presenting models which are used to visualize polarity
and solubility. These activities are aimed at micro-level
understanding of macro phenomena. Video program cues: 23:20
— 30:55
Polarity and solubility demonstrations
Dr. Leslie Pierce demonstrates the difference between polarity
and solubility of alcohol and water.
Activity
Link
- A series of demonstrations
to extend those shown by Dr. Pierce in the video.
Readings
Furio, C. and Calatayud, M.-L. (1996)' Difficulties with
the Geometry and Polarity of Molecules: Beyond Misconceptions,
'Journal of Chemical Education, Vol. 73, No. 1, pp:
36.
Sanger, M.J. and Badger II S.M. (2001)' Using Computer-Based
Visualization Strategies to Improve Students' Understanding
of Molecular Polarity and Miscibility, 'Journal of Chemical
Education, Vol. 78, No. 10, pp: 1412-1416.
Machado, C. (2001)' An Easy and Versatile Experiment to
Demonstrate Solvent Polarity Using Solvatochromic Dyes,
'Journal of Chemical Education, Vol. 78, No. 5, pp:
649-651.
Letcher, T.M. and Battino, R. (2001)' An Introduction to
the Understanding of Solubility, 'Journal of Chemical
Education, Vol. 78, No. 1, pp: 103.
Relating macro and micro
“Understanding the chemistry
of atmospheric processes, for instance, the issue of ozone
depletion, requires knowledge of a wide range of spatial
scales. First, you need to do studies on the micro scale
and look actually on the atomic level, and look at the reactions
occurring between various types of chlorine compounds and
ozone, and what’s happening on the surface of little
particles in the atmosphere. It’s very small detailed
chemistry which is in the heart of what’s going on.
But to place it in a larger context, you also need to be
able to study atmospheric processes as a whole, as they
occur around the globe. You have to understand the ozone
and compounds that are made on one end of the earth, and
are transported to another end of earth. These are very
central tools to environmental science, where you feed in
little bits and pieces of knowledge that you learn from
experiments in the lab, including the rate of a particular
reaction between two molecules, and fit it into a framework
of all important processes are occurr in the atmosphere
over a whole planet and hopefully, if the model is done
well, you can recreate what you are actually seeing in the
atmosphere.”
Dr. Laurie Geller
National Academy of Sciences, Washington, D.C.
Links
- Description of videodisc available from the Journal
of Chemical Education. Part I of the videodisc
contains demonstrations and animations of many chemical
concepts including polarity and solubility.
- Description of videodisc available from the Journal
of Chemical Education. Part II of the videodisc
contains demonstrations and animations of many chemical
concepts including polarity and solubility.
Readings
Ibanez, J.G.; Singh, M.M.; Szafran, Z. (1998)' Laboratory
Experiments on Electrochemical Remediation of the Environment.
Part 4: Color Removal of Simulated Wastewater by Electrocoagulation-Electroflotation,
'Journal of Chemical Education, Vol. 75, pp: 1040-1041.
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