5631
An eight - orders of magnitude enhancement in current across Hg / X - styrene - Si junctions is caused by merely altering a substituent , X .
 Chemical: Hg; Chemical: styrene; Chemical: Si
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: Hg; Chemical: styrene; Chemical: Si