Volcano with baking soda and vinegar
Get white daisies and put them in different color food coloring to dye them (lots of different flowers react to this).
Make crystals (with epsom salts I believe)

At that age I would be doing some long term projects like a space project or a project on forest fires etc. A long term project takes a specific subject and covers it in depth for a couple of weeks. With space I did a long term project about planets. We learned about each individual planet and then the last week we made our solar system with papier mache. The kids loved it!

Reply