( ( ( Use ( the ( Kinetic Theory ) ) ) ( as ( a ( model ( to ( explain ( the ( gas ( phase 2 ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Use) (NP (DT the) (NNP Kinetic) (NNP Theory)) (PP (IN as) (NP (DT a) (NN model) (S (VP (TO to) (VP (VB explain) (NP (DT the) (NN gas) (NN phase) (CD 2)))))))) (. .)))
Use the Kinetic Theory as a model to explain the gas phase 2.
(ROOT (S (NP (NP (DT The) (NN behavior)) (PP (IN of) (NP (JJ ideal) (NNS gases)))) (VP (VBZ is) (VP (VBN explained) (PP (IN by) (NP (JJ kinetic) (JJ molecular) (NN theory))))) (. .)))
The behavior of ideal gases is explained by kinetic molecular theory.