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Putty
 By creating silly putty, students watch liquids turn into solids.  I created my own silly putty and loved this activity.  I'm certain students would too! The procedure for making silly putty is:
1. Mix 15 ml of Elmer white glue with 3 ml water and 2 drops of food coloring. Mix until color is uniform.
2.  While stirring glue solution, add 15 ml of prepared base solution.
3.  Stir rapidly until nearly homogeneous mass is obtained, remove from container and knead by hand to obtain final consistency.

Take a look at my silly putty creation!