- This card is a reference to water. One molecule of water consists of with two hydrogen atoms and one oxygen atom (H2O).
- Interestingly, the reactants in the experiment are liquids, but Hydrogen and Oxygen are gasses at room temperature.
- A test tube and a Boiling flask are shown in this picture. Test tubes and Boiling flasks are commonly used in laboratories, where the H2O bonding would occur.