( ( Chemical mixtures ) ( ( are ( different ( from ( ( chemical reactions ) ( ( in that ) ( , ( ( in ( ( the case ) ( of ( a ( chemical mixture ) ) ) ) ) ( , ( ( the ( two substances ) ) ( are ( ( ( combined physically ) but ) ( not chemically ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Chemical) (NNS mixtures)) (VP (VBP are) (ADJP (JJ different) (PP (IN from) (NP (NP (NN chemical) (NNS reactions)) (SBAR (WHPP (IN in) (WHNP (WDT that))) (S (, ,) (PP (IN in) (NP (NP (DT the) (NN case)) (PP (IN of) (NP (DT a) (NN chemical) (NN mixture))))) (, ,) (NP (DT the) (CD two) (NNS substances)) (VP (VBP are) (ADJP (ADJP (JJ combined) (RB physically)) (CC but) (ADJP (RB not) (JJ chemically)))))))))) (. .)))
Chemical mixtures are different from chemical reactions in that, in the case of a chemical mixture, the two substances are combined physically but not chemically.
(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)))))))))) (. .)))