This sounds like fun....Soda sink or float. Have kids predict whether sodas will sink or float. Most will assume they will all act the same but they won't! Diet pop floats and regular sinks. Nice way to touch on sugar content too :)
Fun Science Experiment: Pour whole milk and add red bull - let sit 5 minutes and the acid in the red bull will cause the protein in the milk to separate - liquid changing to solid! New Science Experiment to try!