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Note:  This hack was recorded live at EdCampNYC on May 5th, 2012 as part of the Model It! Science Inquiry Lesson Slam.


From Observable Changes to Particle Models

Problem of practice

Chemical reactions are usually introduced by a few exciting demos or labs followed by representation of the reactions by balanced reaction equations. How can we help students "see" beyond the symbols of elements in reaction equations and gain a particle view of the reaction process at atomic level?


A single replacement reaction is used to show how to link observable changes to particle behavior duirng chemical reactions. Students piece together a particle "story" based on observable changes and their knowledge on atoms, electrons and ions.

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