Unit 4.6 Chemical Systems in Equilibrium
Using a variety of inquiry teaching methods
and formative assessment techniques, a teacher is shown
developing the concept of a chemical equilibrium system
with a class.
Video program cues: 36:30 41:25
Systems in equilibrium
"If you take that vinegar and oil dressing,
the oil is on the top and the vinegar is on the bottom.
If you shake it up, it is out of equilibrium. In cells it's
the same thing. All day we're eating food and drinking water
the system is always changing. Something is coming in from
the outside and it's excreting something [else]
never always doing the same thing, just sitting there."
Dr. Lou Allamandola
NASA Ames Research Laboratory, California
Models for equilibrium
"What I'm always trying to do is take concrete
things and use them to make analogies so that students can
get some concrete idea of something first and go on from
there. There are many of those that I use in introducing
topics. For example, I use an analogy with aquariums, filling
aquariums, when I'm trying to teach equilibrium."
St. Andrew's Episcopal School, Maryland
Tyson, Louise; Treagust, David F.; Bucat, Robert B.(1999)'
The Complexity of Teaching and Learning Chemical Equilibrium,
'Journal of Chemical Education, Vol. 76, No. 4, pp:
Water volumes in equilibrium demonstration
Irene Walsh teaches about equilibrium by demonstrating
water transfer between two aquariums.
Rudd, J. A., II; Greenbowe, T. J.; Hand, B. M.; Legg, M.
J.(2001)' Using the Science Writing Heuristic to Move toward
an Inquiry-Based Laboratory Curriculum: An Example from
Physical Equilibrium, 'Journal of Chemical Education,
Vol. 78, No. 12, pp: 1680.
to Unit 4.7