| http://www.w3.org/ns/prov#value | - Covalent carbidesThese are of two kinds, (a) volatile and (b) non-volatile (macromolecules).2(a) VolatileThese are small molecules, formed especially by hydrogen and elements from Groups 4 to 6; eg CH4, (CN)2, CO, CS2, CCl4 etc.2(b) Non-volatile macromoleculesCovalent carbides are formed with elements such as boron and silicon.
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