Make sure no air is trapped under the cans. Using the glass container makes a nice visual demonstration for a large group such as your classroom. Use an eyedropper to carefully drip some regular cola through the straw and into the bottom of the water cup. Do not stir the liquids, and notice where the cola stays. Now repeat the procedure using the diet cola, a new cup and straw, and a rinsed eyedropper.
Slime is made by reacting just two compounds or ingredients.
Crosslinking means that the long chains are joined to each other at a few points along the chain. Such a process makes the molecules so heavy that they are no longer soluble in water, and a gel begins to form. If your adult partner has special access to the following chemicals, a great slime can be made. Your slime can be kneaded into an elastic, semi-rigid glob that has highly physical properties. If the gel is simply suspended from your hand, it will flow and stretch.