Teacher resources and professional development across the curriculum

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[Channel-talkchemistry] Reactions in chemistry workshop #4 2nd post

From: Joe Lannan <jlannan@esu3.org>
Date: Mon Nov 01 2004 - 10:14:10 EST

This workshop continues to focus on activities that expand student
understanding and problem solving abilities though teacher/student directed
work. I thought that Dr. Clarks activity with students observing two
balances for 5 minutes with the pan empty was an good starting activity.
Posting recorded data and have students discuss what the information
represented was very useful when discussing measurements and significant
figures. In addition Mr. Pratuchıs demonstration with mixing volume of
liquids evoked a good discussion on atomic structure and how some molecules
can get closer together when mixed with other molecules with similar
structures. I have seen this same demonstration using a long glass tube
with corks on either end. The demonstration starts by filling the tube half
filled with blue colored water then finish filling the tube with a different
colored ethanol. Cork the end and then start mixing by turning the tube
over and over. A bubble starts to form and gradually grows as the mixing
continues. As the teachers mixes the class room discussion can continue.
As part of the homework assignment I am going to use Ms. Walshıs equilibrium
activity involving water volumes in equilibrium. I think Ms. Walshıs
discussion prior to the activity was important to define terms, make
predictions and set the ground rules. A variation that would be useful and
extend students understanding of equilibrium would be to use different size
beakers, start with some water in the ³ products² aquarium and varying the
rate by speeding up or slowing down the transfer of water. I think another
extension would be to plot the amounts of reactants and products as the
reaction proceed forward.

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Received on Mon Nov 1 10:53:59 2004

 
 

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