## Reflection: Routines and Procedures Density Part II and Review - Section 3: Elaborate

At this point in the year I begin to switch students into different lab groups than simply who they are sitting with at their tables.  This is a practice which I continue to use for most labs throughout the school year.

I have students move to lab groups randomly through using cards.

• I use a deck of cards with the Aces through 8's for groups 1-8.
• I randomly give one card to each student (unless I specifically want some students to not work together and will make sure they have different cards as I walk around)
• I then have students go up to their lab stations.
• If a class has more than 32 students than I will just tell the last few students to pick a station to make a group of 5, and in classes with less than 32 students I will make sure that all groups have at least 3 before any group has 4 students while passing out cards.

I find that students work more efficiently when they are placed in cooperative groups with specific roles.

• The attached image has an example of how I might give students roles of Primary Investigator, Post-Doc, Graduate Students, and Undergraduate Student.  I like to use the "real-world" lab roles to get them into the idea of who works in labs.
• To help students with their specific roles I will have each suit be one of the roles.  I will simply say something like all the hearts are the Primary Investigator, etc.
• If a group has 3 students I will combine the Primary Investigator with the Post Doc or if a group has 5 students that I will make two graduate students.
• I will have students switch roles as they are doing the lab (for this lab I have them switch after each trial).
• This class video demonstrates how I assign students roles and help them get situated for a lab.

Routines and Procedures: Cooperative lab groups

# Density Part II and Review

Unit 1: Unit 1: Working as a chemist
Lesson 9 of 9

## Big Idea: Density is an intensive property which is useful for identifying unknown substances.

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Subject(s):
Science, Chemistry, Scientific Method (Science Skills), dimensional analysis, culture
100 minutes