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 not flammable, so it can be used in fire extinguishers or as an additive to make other chemicals nonflammable. It is also very useful as a raw material in synthesizing larger, more complicated organic compounds.rganic chlorine useful compounds. Carbon tetrachloride is an organic chemical that is commonly used as a solvent. It is also called tetra chloromethane and is composed of molecules that have one carbon atom and four chlorine atoms bonded together in the shape of a tetrahedron.