This Colorful Investigation can teach or reinforce multiple concepts at the same time, such as lab safety, chemical safety, team work, following directions, making careful measurements, identifying basic lab ware, and working with lab tools and equipment.
There is flexibility in how you use it, but I typically give little to no instruction and observe what my students do. Because this is not a "dangerous" lab (with the exception of food coloring), I am quickly able to see if my students know