Chemical Reaction Components
A chemical reaction involves two or more molecules reacting to create a new compound or change in molecular structure, such as mixing baking soda (sodium bicarbonate) and vinegar (acetic acid) to create a chemical reaction that produces carbon dioxide gas, which can be used to inflate a balloon or push an object. A chemical reaction is different from a physical change, like melting ice.
Teams should consider writing out the chemical equation to show that it is a chemical reaction, not a physical change. Team members handling chemicals must wear protective eyewear and gloves. Teams not handling chemicals safely will be disqualified. Chemical reactions must be contained within the machine’s dimensions. Bystanders and judges should be able to view the machine without needing protective eyewear.
The chemical reaction should be simple and safe. Safe ingredients include baking soda, vinegar, citric acid, borax, glue, hydrogen peroxide (3% solution), yeast, baking powder, Alka-Seltzer tablets, lemon juice, dish soap, club soda, gelatin, acidic juices, and corn syrup.
Use ingredients outside this list cautiously and research their safety. Open flames, explosions, excessive heat, Bunsen burners, and chemicals that cannot be disposed of safely are not allowed.