5797
From scattering simulations of an NO ( 2 ) molecule interacting with a water slab we observed that the majority of the scattering events resulted in outcomes in which the NO ( 2 ) molecule became trapped at the surface or in the interior of the water slab .
 NO ( 2 ), NO ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 NO ( 2 ), NO ( 2 )