Discover and define differnet kinds of mixtures with the Making Mixtures activity.
Optional: Look at the colloidal particles in milk under the microscope, by making a slide of a milk drop and look at the edges of the liquid where it is thin to see individual fat droplets.
Then make colloids, first with oobleck, then with butter. In butter making, three colloids are made.
Optional: Look at the particles in oobleck by making a slide of oobleck to look at under the microscope. Look at the edges of the material where it is thin to see the individual cornstarch particles.