( ( To ( predict ( whether ( it ( will ( be ( ( ( a gas ) , ) ( ( ( ( liquid or ) low-melting ) solid ) ( at ( room temperature ) ) ) ) ) ) ) ) ) ) ( , ( you ( wil ( ( need ( to ( look ( at ( ( the size ) ( of ( ( ( the molecule ) and ) ( its ( H-bonding capability ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB predict) (SBAR (IN whether) (S (NP (PRP it)) (VP (MD will) (VP (VB be) (NP (NP (DT a) (NN gas)) (, ,) (NP (NP (ADJP (JJ liquid) (CC or) (JJ low-melting)) (JJ solid)) (PP (IN at) (NP (NN room) (NN temperature)))))))))))) (, ,) (NP (PRP you)) (ADVP (RB wil)) (VP (VBP need) (S (VP (TO to) (VP (VB look) (PP (IN at) (NP (NP (DT the) (NN size)) (PP (IN of) (NP (NP (DT the) (NN molecule)) (CC and) (NP (PRP$ its) (JJ H-bonding) (NN capability)))))))))) (. .)))
To predict whether it will be a gas, liquid or low-melting solid at room temperature, you wil need to look at the size of the molecule and its H-bonding capability.
(ROOT (S (NP (NNS Gases) (CC and) (NNS liquids)) (VP (VBP become) (NP (NNS solids)) (PP (IN at) (NP (JJ low) (NNS temperatures)))) (. .)))
Gases and liquids become solids at low temperatures.