( ( ( ( Water , ) ( ( ( a ( polar ( covalent Hydrogen ) ) ) and ) ( Oxygen compound ) ) ) , ) ( ( ( will not ) ( help ( save you ) ) ) . ) )
(ROOT (S (NP (NP (NNP Water)) (, ,) (NP (NP (DT a) (JJ polar) (NN covalent) (NN Hydrogen)) (CC and) (NP (JJ Oxygen) (NN compound))) (, ,)) (VP (MD will) (RB not) (VP (VB help) (VP (VB save) (NP (PRP you))))) (. .)))
Water, a polar covalent Hydrogen and Oxygen compound, will not help save you.
(ROOT (S (NP (NN Hydrogen) (NN chloride)) (VP (VBZ is) (NP (DT a) (JJ covalent) (NN compound))) (. .)))