Differentiation Modifications Tips Have the students store their 3.3 Evidence-Based Arguments Tool for Soda Water Fizzing in the same place as their Expressing Ideas and Questions and Predictions and Planning tools so they can be easily revisited. Because this is the first time students will use the Evidence-Based Arguments Process Tool, review the questions ahead of time so they understand the purpose and structure of the tool. Extending the Learning Students can return to a discussion of other situations where bubbles form and leave liquids, such as the bubbles that form when water is boiled, when baking powder or Alka-Seltzer are dissolved in water, or when vinegar and baking soda are mixed. How does what they have learned about soda water affect their ideas and questions about those situations? Use cobalt chloride indicator paper to test for the presence of water after soda water fizzing activity.