( ( Synergistic reactions ) ( ( occur ( when ( ( ( the sum ) ( of ( the ( combined reaction ) ) ) ) ( ( is huge ) ( compared ( to ( ( the ( same substances ) ) ( in ( individual reactions ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Synergistic) (NNS reactions)) (VP (VBP occur) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (DT the) (VBN combined) (NN reaction)))) (VP (VBZ is) (ADJP (JJ huge)) (PP (VBN compared) (PP (TO to) (NP (NP (DT the) (JJ same) (NNS substances)) (PP (IN in) (NP (JJ individual) (NNS reactions)))))))))) (. .)))
Synergistic reactions occur when the sum of the combined reaction is huge compared to the same substances in individual reactions.
(ROOT (S (NP (DT A) (NN combination) (NN reaction)) (VP (VBZ is) (NP (NP (DT a) (NN reaction)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (CC or) (JJR more) (NNS substances)) (VP (VBP combine) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJ single) (JJ new) (NN substance)))))))))) (. .)))