About This Lesson
This activity uses salt, sugar, and flour to demonstrate the difference between suspensions and solutions. Students mix the same amount of each with the same amount of water and observe the differences. They also make a graph of their results and predictions based on them. The activity can be motivated by having students recall their eperiences with eating cereal and how the color and flavor of the milk changes. The scientific principles behind the activity are also responsible for the formation of river beds and used by NASA scientists to determine that water once flowed on mars.
