Reflection: Day 1: Ionic Compound Formulas - Section 3: Intro to Activity


My students struggled to understand that the numbers of cations and anions were not simply the charges.  I struggled to explain it to them in small groups over and over.  Something just was not getting through.  My students who did "get it" had difficulty articulating how they understood it and I was having difficulty trying to find a way other than the way I had already used to explain how to complete the assignment.

I was frustrated that it seemed like half of the class just was not making the connections, and I thought about what I could do to help them understand.  I knew I did not want to just move on through the material without giving my students (and myself) another chance for success.

I made a document with "ions" that could be cut out to model the charges of the different cations and anions.  I made sure that they were the right size so that when charges balanced, the ions should line up and visually provide students with the understanding that the total charge must cancel out.

This seemed to work really well for students who had struggled before.  I have edited this lesson to reflect what I would do in the future, with continuing work in the Day 2: Ionic Compound Formulas lesson.

  Students Needed Scaffolding!!
  Students Needed Scaffolding!!
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Day 1: Ionic Compound Formulas

Unit 2: Electron Configuration & Bonding
Lesson 5 of 9

Objective: SWBAT determine molecular formulas for ionic compounds using a periodic table and a list of polyatomic ions.

Big Idea: Ionic compounds have an overall neutral charge which determines their molecular formulas.

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ionic compounds
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