Designing a middle-school at-home chemistry unit: safe, engaging demos

[JohnRT]

I'm a middle school science teacher trying to design a new unit on basic chemistry where students conduct safe, engaging home science experiments with common household materials. I want to move beyond the classic baking soda volcano. For educators or parents who have done this successfully, what are some reliable and visually striking experiments that demonstrate concepts like chemical reactions, pH, or density? How do you structure the lessons to ensure safety and proper supervision while still allowing for genuine inquiry, and what are the best ways for students to document their process and observations at home? What inexpensive materials or kits have you found most versatile for a range of experiments?