( ( ( ( ( ( At room ) ( ( temperature monochloroethane ) ( is ( a gas ) ) ) ) ( , ( ( hexachloroethane ( is ( a solid ) ) ) , ) ) ) and ) ( ( the ( seven ( other chloroethanes ) ) ) ( are liquids ) ) ) . )
(ROOT (S (S (PP (IN At) (NP (NN room))) (NP (NN temperature) (NN monochloroethane)) (VP (VBZ is) (NP (DT a) (NN gas)))) (PRN (, ,) (S (NP (NN hexachloroethane)) (VP (VBZ is) (NP (DT a) (JJ solid)))) (, ,)) (CC and) (S (NP (DT the) (CD seven) (JJ other) (NNS chloroethanes)) (VP (VBP are) (NP (NNS liquids)))) (. .)))
At room temperature monochloroethane is a gas, hexachloroethane is a solid, and the seven other chloroethanes are liquids.
(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.