Reflection: Modeling Identifying Unknown Substances as Ionic or Not Ionic - Section 3: Pre-Lab Introduction


We have all heard it before: "Tell me, I forget.  Show me, I remember.  Involve me, I understand." (attributed to Carl Orff)

Just talking to students about lab procedure is not enough.  When I started teaching, I thought that if I just explained it well enough and provided justification for why we do things certain ways, surely students will follow the procedure properly.  What I discovered was that it just did not make a difference if I spent 5 minutes explaining or 15 minutes, there were always a handful of students who just could not translate what I told them to do into action.

Once I started showing them exactly what I wanted them to do, as I explained, students grasped what was expected with much more clarity and were more successful in completing the lab investigations.  Now, I model specific steps as I explain them.  It does not take any more time than the explanations did themselves, and my students are more successful.

  The Importance of DEMONSTRATING Lab Techniques
  Modeling: The Importance of DEMONSTRATING Lab Techniques
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Identifying Unknown Substances as Ionic or Not Ionic

Unit 2: Electron Configuration & Bonding
Lesson 7 of 9

Objective: SWBAT use conductivity meters to identify solutions that are made by dissolving ionic compounds in water.

Big Idea: Ionic compounds dissolve in water producing ions that can conduct electricity; we can use this fact to identify unknown substances as ionic or not ionic in lab.

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testing for conductivity
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