[Channel-talkchemistry] Reactions in chemistry workshop 1
This post will be related to the homework assignments.
1. Misconceptions in chemistry from prior experience can be very hard to
correct. Mr. Pratuchıs school emblem of the atom was an interest problem.
I think once it was recognized it can be delete with. I think his way of
having the students work through the misconception was very powerful.
2. It is always hard to develop an understanding of a theory that is too
small to see and test directly. Using models then become very important.
To develop a historical perspective of atomic theory is an excellent way to
show how science discovery works. From Democritus vs. Aristotle atomic view
to Daltonıs use of conservation and definite proportions laws to develop his
atomic theory is good start to show students how models change. Rutherford
changing JJ Thompsonıs ³plum pudding² model reinforces how models have to be
changed when new data is gathered. Indirect observations can be modeled
using a ³black box² activity. To bring atomic theory into the 20th century
with the Bohr model, Quantum mechanics, Heisenberg Uncertainty principle and
electron configuration only broadens student atomic theory view which is
necessary to study and understand chemistry.
3. An excellent activity to help develop student understanding of molecular
shape is the activity Tom Pratuch presented on the video. Hands on
activities is important to expand student understanding. The balloons find
their own ³shape² based on how many balloons are used. That can be used to
reinforce the natural shapes of molecules.
Some additional activities I do the reinforce molecular shapes and periodic
arrangement of elements are:
1. ³ Win, Lose, or Draw² lab activity that involves students drawing Lewis
structures of various molecules then making them using toothpicks and
2. After watching the World of Chemistry video on the Periodic Table, the
students do a ³ Periodic Puzzle² involving placing 30 ³elements² in an
organized table using density, melting point, boiling point and reactivity
with chlorine as organizing tools.
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Received on Fri Oct 15 13:17:03 2004