2.1 organic compounds

• benzene ring: the hexagonal-ring-shaped chemical structure formed by six carbon atoms and six hydrogen atoms or other atoms
• aromatic ring: another name for a benzene ring
• phenyl ring: another name for a benzene ring
• remediation: the removal of pollutant from soil, groundwater, or surface water
• persistent organic pollutant (POP): an organic compound that is resistant to being broken down by biological or chemical menas
• resonance: a concept used to describe the true structure for certain compounds that cannot be accurately represented using any one type of bonding structure
• polycyclic aromatic hydrocarbon (PAH): a compound that contains multiple benzene rings produced by the incomplete combustion of organic substances, like oils, gasoline, diesel, wood, garbage and plastics
• synthetic organic molecule: a human-made compound containing carbon
• chlorofluorocarbon (CFC): a synthetic organic molecule in which hydrogen atoms are replaced with chlorine and fluorine atoms, also called Freon
• functional grounp: an arrangement of single atoms of groups off atoms, other than carbon or hydrogen, attached to an organic molecule
• halogenated hydrocarbon: a hydrocarbon molecule that has one of more hydrogen atoms replaced by atoms of chlorine, fluorine, bromine, or iodine
• stratosphere: the portion of the atmosphere between 10 km and 50 km above earth's surface
• ozone layer: the portion of the stratosphere, where the highest concentrations of ozone occur
• antioxidant: a substance that prevents the oxidation of another substance; a substance present within the body or other materials that react with free radicals to protect important components