Students were able to learn about mixtures and solutions first hand with this lab. They began by observing the physical properties of the materials that were to be combined: salt, corn starch, water and mulch. They immediately observed that the mulch could be removed with the screen which made the concoction and mixture (when two or more substances are combined and are not chemically bonded and can be easily separated). They realized that remained was a solution (type of mixture in which one substance can't be removed from another substance)...or was it? They devised a plan to prove that it was a mixture. In a petri dish, they placed a few drops from the glass. It was set aside for a few days to let the water evaporate. With no water, the salt and corn starch remained and were easily separated with a hand lens and spoon. Jerry told, "I loved this fantastic activity on mixtures and solutions. Telling me the differences of mixtures and solutions and how to separate them was interesting, also it gave me the definitions of a mixture and a solution." You-Wei laughed, "I really liked how we can actually separate the salt and starch in the petri dish. It is of my favorite experiments yet."
I hope you enjoy learning how the garden changes throughout the school year.