( ( This feedback ) ( ( is ( ( ( positive ( for ( exothermic reactions ) ) ) and ) ( negative ( for ( endothermic reactions ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN feedback)) (VP (VBZ is) (ADJP (ADJP (JJ positive) (PP (IN for) (NP (JJ exothermic) (NNS reactions)))) (CC and) (ADJP (JJ negative) (PP (IN for) (NP (JJ endothermic) (NNS reactions)))))) (. .)))
This feedback is positive for exothermic reactions and negative for endothermic reactions.
(ROOT (S (S (VP (VBZ Is) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (NP (NN reaction)) (PP (IN for) (NP (DT an) (JJ endothermic) (NN reaction)))))))) (VP (VBZ is) (ADJP (JJ positive))) (. .)))