( ( Reaction rates ) ( ( depend ( on ( ( how often ) ( reacting ( ( ( atoms and ) molecules ) ( encounter ( one ( ( ( ( ( another , ) ( the temperature ) ) , ) and ) ( ( the properties ) ( of ( the ( reacting species ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Reaction) (NNS rates)) (VP (VBP depend) (PP (IN on) (SBAR (WHADVP (WRB how) (RB often)) (S (VP (VBG reacting) (S (NP (NNS atoms) (CC and) (NNS molecules)) (VP (VB encounter) (S (NP (PRP one)) (NP (NP (DT another)) (, ,) (NP (DT the) (NN temperature)) (, ,) (CC and) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (DT the) (JJ reacting) (NN species))))))))))))) (. .)))
Reaction rates depend on how often reacting atoms and molecules encounter one another, the temperature, and the 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.