Activity Notes: 1  It will be important to discuss the procedure with the students before beginning the activity (the instructions on the student worksheet may not be clear without guidance). 2  It is suggested that students work in groups of four. 3  It takes about 30 seconds for the food coloring to dissolve in the hot water. The actual dispersion activity should not run longer than two minutes. A common data table can be composed on the overhead, board, or computer, where students can write their data and observations.