20737
The theory predicts for the enthalpy of dilution to be exothermic and the enthalpy of mixing endothermic , while experiments show that signs of the heat effects depend on the nature of the counterion of the added salt , as also on the hydrophobicity ( numbers x , y of methylene groups ) of the ionene .
 Chemical: methylene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: methylene