Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
10 Baking Soda Science Experiments for Kids - Kids from preschool and kindergarten to elementary age will enjoy these hands on science experiments using baking soda. Great for homeschooling families! by bernadette