Middle School Chemistry: Big Ideas about the Very Small is a FREE middle school unit provided by the American Chemical Society. You can download all six chapters:

• Matter
• Changes of State
• Density
• The Periodic Table & Bonding
• The Water Molecule & Dissolving
• Chemical Change

Each chapter has multiple lessons supported with activity sheets and online visualizations/interactives. You can download the entire unit or individual chapters and lessons.

Potential Uses: this resource could provide activities to supplement existing instructional materials.