Before beginning the Systems and Scale Unit, you need to decide what to teach and importantly, what not to teach! Use this page to choose the unit sequence that’s most appropriate for your students.
- Optional activities in the Systems and Scale Unit are designed to provide supportive learning opportunities for students who have not previously studied or who are still working to develop proficiency with regard to reasoning about scale and chemical change. Use your professional judgment to decide whether or not to teach each optional lesson or activity.
Unless otherwise noted in the table below, all activities in the unit should be taught.