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


While 4-6 students per group may not seem like a "small" group, I have 45 students in each of my chemistry classes.  For lab work that is truly more in depth, like labs that involve measuring and calculations, I would certainly prefer that students work in trios.  I have found that groups of 3 usually are big enough to spread around the responsibilities, but small enough that everyone needs to pitch in to complete the investigation.  However, this particular lab activity is more observational than anything, and because I want to be able to walk around and ask each group questions during what typically is a very short lab activity, I need to keep my number of groups manageable.  For my class set-up, if I have more than 8 student groups, I probably will not be able to interact with each group and ask probing questions during this activity--again, because it takes such little time to complete.

  Are Groups of 4-6 Students Really Small Groups?
  Student Grouping: Are Groups of 4-6 Students Really Small Groups?
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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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