19111
The formation of the hydrated electron through the secondary reaction , H + OH ( - ) --> H ( 2 ) O + e ( aq ) , has been examined in the sonolysis of argon - saturated aqueous solutions at an ultrasound frequency of 355 kHz .
 Chemical: H; Chemical: OH ( - ); Chemical: H ( 2 ) O; Chemical: argon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: H, OH ( - ), H ( 2 ) O, argon 
Answer:
 Chemical: H; Chemical: OH ( - ); Chemical: H ( 2 ) O; Chemical: argon