Assessment
During the demonstration, note how students express their ideas about the difference between mass and dry mass or solid mass.
Tips
- When possible, lead the demonstrations in such a way that students can see what you are doing. Make use of a document camera, move classroom furniture around, position students strategically, elicit student volunteers to help with different steps, etc.
- Don’t forget to carefully model for students how to account for the tare of the container when measuring the mass of the solids and mixtures.