( ( Reaction rates ) ( ( depend ( ( ( ( ( ( on ( ( how often ) ( ( the ( reacting ( ( atoms and ) molecules ) ) ) ( encounter ( one another ) ) ) ) ) , ) ( on ( the temperature ) ) ) , ) and ) ( on ( properties ( of ( the ( reacting species ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Reaction) (NNS rates)) (VP (VBP depend) (PP (PP (IN on) (SBAR (WHADVP (WRB how) (RB often)) (S (NP (DT the) (NNP reacting) (NNS atoms) (CC and) (NNS molecules)) (VP (VB encounter) (NP (CD one) (DT another)))))) (, ,) (PP (IN on) (NP (DT the) (NN temperature))) (, ,) (CC and) (PP (IN on) (NP (NP (NNS properties)) (PP (IN of) (NP (DT the) (JJ reacting) (NN species))))))) (. .)))
Reaction rates depend on how often the reacting atoms and molecules encounter one another, on the temperature, and on properties of the reacting species.
(ROOT (S (ADVP (RB Replace)) (NP (NP (DT another)) (PP (IN in) (NP (DT a) (NN molecule)))) (VP (VBZ happens) (PP (TO to) (NP (NNS atoms))) (PP (IN during) (NP (DT a) (NN substitution) (NN reaction)))) (. .)))
Replace another in a molecule happens to atoms during a substitution reaction.