We conducted an experiment. We put vinegar in a plastic bottle, and baking soda in a balloon. When we put the balloon on the bottle, the baking soda fell in and mixed with the vinegar. Magic! There was a chemical reaction. It frothed and blew the balloon up!
We were a bit worried it might blow up! Some of us were checking the exit. As Ms Jones was taking the photos we didn't get a picture of her getting sprayed with the vinegar mixture when she took the balloon off the bottle. The children really liked that part.