Take 4 empty one-gallon jugs and put 1/4 cup of salt in one, 1/2 cup of salt in one, 3/4 cup of salt in one, and no salt in the last one. Add different colors of food coloring to each one. If you ...

Tell students that they will first compare how well salt and sugar dissolve in water. Then they will use their results to figure out what the unknown substances are in cups A, B, and C. Tell students ...