( ( ( Lead and ) barium ) ( ( form ( insoluble ( sulfate precipitates ) ) ) . ) )
(ROOT (S (NP (JJ Lead) (CC and) (NN barium)) (VP (VBP form) (NP (JJ insoluble) (NN sulfate) (NNS precipitates))) (. .)))
Lead and barium form insoluble sulfate precipitates.
(ROOT (S (NP (JJ Lead) (NN sulfate)) (VP (VBZ is) (NP (NP (DT the) (JJ white) (JJ solid)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (PP (IN on) (NP (JJ corroded) (NN battery) (NNS terminals)))))))) (. .)))