( ( A ( chemical reaction ) ) ( ( rearranges ( ( ( the ( constituent atoms ) ) ( of ( the reactants ) ) ) ( to ( ( create ( different substances ) ) ( as products ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN chemical) (NN reaction)) (VP (VBZ rearranges) (S (NP (NP (DT the) (JJ constituent) (NNS atoms)) (PP (IN of) (NP (DT the) (NNS reactants)))) (VP (TO to) (VP (VB create) (NP (JJ different) (NNS substances)) (PP (IN as) (NP (NNS products))))))) (. .)))
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
(ROOT (S (NP (DT All) (NN chemical) (NNS reactions)) (VP (VBP involve) (NP (CC both) (NNS reactants) (CC and) (NNS products))) (. .)))
All chemical reactions involve both reactants and products.