The Prefix is Otterbox's least expensive iPhone case. The durable silicone, polycarbonate skeleton build of the OtterBox Prefix is thicker than the Commuter and Reflex, but also the least protective. The Prefix is a one-piece case, meaning that it does not snap in place like the Reflex .
carbon is considered tetravalent because it has four valence electrons the valence electrons are in the outermost shell of the atom and allows carbon to form four bonds to other atoms
Carbon tetrachloride is a colorless organic compound with the chemical formula CCl4. The International Union of Pure and Applied Chemistry (IUPAC) name for this chemical is tetrachloromethane. Carbon tetrachloride is often used as an organic solvent, a fuel additive, a catalyst, a refrigerant or a metal de-greaser. Prolonged exposure to this chemical can be harmful to the liver, kidneys and central nervous system. At room temperature, carbon tetrachloride is a colorless liquid.