( ( ( Calcium carbide ) ( -- ( ( known ( by ( the ( chemical ( formula CaC2 ) ) ) ) ) -- ) ) ) ( ( is ( ( a compound ) ( composed ( of ( the ( elements ( ( calcium and ) carbon ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Calcium) (NN carbide)) (PRN (: --) (VP (VBN known) (PP (IN by) (NP (DT the) (JJ chemical) (NN formula) (NNS CaC2)))) (: --))) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (VP (VBN composed) (PP (IN of) (NP (DT the) (NNS elements) (NN calcium) (CC and) (NN carbon)))))) (. .)))
Calcium carbide -- known by the chemical formula CaC2 -- is a compound composed of the elements calcium and carbon.
(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)))) (. .)))