( ( Lead carbide ) ( ( is ( ( a ( hypothetical ( chemical compound ) ) ) ( of ( ( carbon and ) lead ) ) ) ) . ) )
(ROOT (S (NP (JJ Lead) (NN carbide)) (VP (VBZ is) (NP (NP (DT a) (JJ hypothetical) (NN chemical) (NN compound)) (PP (IN of) (NP (NN carbon) (CC and) (NN lead))))) (. .)))
Lead carbide is a hypothetical chemical compound of carbon and lead.
(ROOT (S (NP (NP (JJ Binary) (NNS compounds)) (PP (IN of) (NP (NP (NN carbon)) (PP (IN with) (NP (ADJP (RBR less) (JJ electronegative)) (NNS elements)))))) (VP (VBP are) (VP (VBN called) (NP (NNS carbides)))) (. .)))