This is a set of activities I used as stations right before spring break. We had younger grades come in and experiment with us, too and they loved it.
There are 5 activities: The unbreakable egg; sink or float with a raw egg (students notice that the egg sinks and then they need to add the appropriate amount of salt to the beaker to get the egg to float.); dyeing an egg volcano style (use egg dye or food coloring and baking soda to make a paste, color the egg and drop the egg into a beaker with vinegar to dye it.-baking soda and vinegar react to show a chemical change and also "explode"); Egg in a bottle trick; and dyeing eggs with sharpie markers (add rubbing alcohol and it causes the physical change to make the colors smear and look tie dyed.
The middle school students loved it and so did the 3rd and 4th graders who came to experiment with us. It teaches proper science safety (goggles, fire safety, aprons, hair back, sleeves rolled up, follow directions) and also touches on science content.
I used this activity right before spring break, but it could also be used for physical science throughout the year.
Product by Megan Decker.