Description
On the table is a small container. You lift the lid off the container and pour 3 beads onto the table. You explain that the 3 beads symbolize 2 hydrogen atoms and 1 oxygen atom. The three beads (atoms) are placed in the tube and the lid is put on. You ask the audience if anyone knows what the chemical form of 2 hydrogen atoms and 1 oxygen atom,H2O, stands for. It is certain that someone will answer: water.
You now take the lid off the container and it is now filled with water, which you pour out.
Danish explanation included.