( ( Hydrogen peroxide ) ( gradually ( ( ( decomposes ( at ( room temperature ) ) ) ( to ( produce ( oxygen ( ( gas and ) water ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Hydrogen) (NNP peroxide)) (ADVP (RB gradually)) (VP (VBZ decomposes) (PP (IN at) (NP (NN room) (NN temperature))) (S (VP (TO to) (VP (VB produce) (NP (NN oxygen) (NN gas) (CC and) (NN water)))))) (. .)))
Hydrogen peroxide gradually decomposes at room temperature to produce oxygen gas and water.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (PP (IN in) (NP (NP (NN gas) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))