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Systems and Scale | Activity 3.3

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

Target Student Performance

Students (a) use data from their investigations to develop evidence-based arguments about matter movements and matter changes when soda water fizzes, and (b) identify unanswered questions about matter movement and matter change that the data are insufficient to address.

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 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.