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Systems and Scale | Activity 2.5

Activity 2.5: Using a Digital Balance and BTB (30 min)

Target Student Performance

Students (a) practice using two key tools for investigation—digital balances and BTB—with accuracy and precision and (b) describe how they can use these tools to detect matter movement and matter change.

Students practice using a digital balance and BTB to prepare for the investigations in future lessons.

Resources You Provide

  • BTB, blue (1 cup per group of four students)
  • clear plastic cups (1 per group of four students)
  • digital balance (1 per group of four students)
  • paper clips (10 per group of four students)
  • safety glasses (1 per group of four students)
  • straws (1 per group of four students)

Resources Provided

1. Use the instructional model to show students where they are in the course of the unit.

Show slide 2 of the 2.5 Investigation Tools PPT.

We expect that individual students, and the class as a whole, will often have difficulty identifying sources of error and finding patterns in the data. Yet these skills are essential if they are to interpret the results of their investigations meaningfully. In particular, you will be working with students to identify patterns across multiple replications - for example, when different groups in your class all conduct the same investigation. The students will have to decide what claims about patterns are justified. Listen for their responses to the discussion in the final step to determine if they need more support in identifying sources of error or finding patterns.