[Yes, you too can learn about Quantum Mechanics through 2-part cards!]
This has been a big hit. Each week one of the dc leads us in 5 chemistry experiments from the book. We mostly go in order but sometimes an experiment gets postponed if we're out of something and we go ahead to another one. They gather their materials and then lead. They read aloud the purpose and tell the procedure as they do it. Then they read the results, etc. At the end of the session each dc picks one they want to write about in their Chemistry lab books (or Science Log for youngest). They write and illustrate about the experiment. The olders can copy the purpose/procedure or put it in their own words. The results and explanation always come from their own words. Youngest dd just writes about it and draws a picture. My job throughout all of this: stay out of the way! As moms you all know how hard that is sometimes :).