Eggs in vinegar experiment
Add an egg in a glass and add as much 7% vinegar that it covers the egg. Cover the jar with a lid without completely resealed (due. Gas evolution).
Allow the egg form the next day (or longer). It turns into a bouncing ball, you can try many different ways with the egg. Examples Taking it a glass of water To see if the yolk Sinking down or float it up. Or play and bounce it.