Naked egg experiment- Dissolve egg shell off with vinegar and it will become a "naked egg" that can bounce. A great experiment for spring break!- We did this and K loved it! I would suggest naked egg investigation be done outside.
This is a tutorial on how to make an air canon using a balloon and water bottle. You can see how air flies out of the bottle as a vortex by watching the smoke ring that comes out. It is an awesome air canon smoke ring science experiment to show your kid!
Sensory bottle idea: Cut up pipe-cleaners and place them in a bottle. Use a magnet to manipulate them. Lots of other sensory bottle ideas, too.
Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!