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This is a set up for Decomposition of Hydrogen Peroxide. H2O2. The yellow hexagon shape you see is an inverted graduated cylinder. It is filled with water. You may have played with a similar set up as a kid in a bath tub. If you invert a container in water, it does not lose any water in the cylinder. A syringe is filled with 3 ml of KI (Potassium Iodine. The tube is then inserted into the cylinder. The Erlenmeyer flask has a rubber stopper so it is air tight. One the syringe is injected into the flask that is filled with air, the reaction cause a release of gas which then travels through the tube and into the graduated cylinder. The gas displaces the water from the cylinder into the container.
Various atoms and molecules as depicted in John Dalton's A New System of Chemical Philosophy (1808).
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