So after the vinegar test, we learned a new property about some of the chemicals. Some of the chemicals reacted to vinegar and created a gas. With iodine at our fingertips, students suggested to use iodine to see if it revealed any new properties to us! Check out this picture to see the results!
Notice the orange chemical's reaction? It turned blackish/blue when exposed to iodine, while the others remained rusty brown in color. I wonder what this means about the chemicals' identities...