Compare with reactant . A substance that is produced during a chemical change . A naturally occurring amino acid with a heterocyclic ring that is classified as nonessential in the diet. A colorless, odorless, flammable gas, found in petroleum and natural gas. It is used as a fuel and as a raw material for building more complex organic molecules.
Propane is the third member of the alkane series.
A mixture of fuel and oxidizing agent that reacts to produce a high-energy stream of product gases that can produce thrust. A compressed gas used to push a material through a nozzle, forming an aerosol or a foam . A complex polymer made by linking together amino acid molecules. Proteins sometimes contain non-amino acid components such as metal ions or porphyrin rings embedded within. An elementary particle found the atomic nucleus with a positive charge equal and opposite that of the electron .