Kinder Egg "Grenade"

Print this container. Fill sodium bicarbonate (1 teaspoon) into the container and insert it into a Kinder Egg toy container. Fill vinegar into the lid of the toy container. Close the toy container carefully without mixing vinegar and sodium bicarbonate. When you are ready to throw the "grenade", give it a really fast shake and throw it.

This is really just for fun. Nothing dangerous. Only a pop. The acid in the vinegar reacts with the sodium bicarbonate and produces carbon dioxide - enough to open the lid of the toy container.