Physical is a different concept from Chemical. Chemical is related to Solution. one thing you do when you Think is Solution. Think is a synonym of Suspect. 
Vote is a synonym of Voice. you are likely to find Voice in/at/on Telephone. Telephone is related to Cable. 
Physical <--DistinctFrom--> Chemical <--RelatedTo--> Solution <--HasSubevent-- Think <--Synonym--> Suspect 
Vote <--Synonym--> Voice --AtLocation--> Telephone <--RelatedTo--> Cable 