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Systems and Scale | Activity 3.3

Activity 3.3: Evidence-Based Arguments for Soda Water Fizzing (50 min)

Students use evidence from their soda water fizzing investigation to form arguments about what happened in the Evidence-Based Arguments Process Tool.

Materials You Provide

Resources Provided


Print one copy of 3.3 Assessing the Evidence-Based Arguments Tool for Soda Water Fizzing for each student. Make sure that the 3.2 Soda Water Fizzing Class Results 11 x 17 Poster (or spreadsheet) from the previous activity is available.


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


During the class discussion, listen for students making connections to the investigation and their arguments. Are they drawing on observations from the investigation, or from other sources of knowledge and experience? Use the 3.3 Assessing the Evidence-Based Arguments Tool for Soda Water Fizzing to compare your students’ answers with patterns in student thinking from other classrooms.


  • Have the students store their 3.3 Evidence-Based Arguments Tool for Soda Water Fizzing in the same place as their Expressing Ideas and Predictions tools so they can be easily revisited.
  • Because this is the first time students will use the Arguments Tool, review the questions ahead of time so they understand the purpose and structure of the tool.