Petrochemical rhymes with:
electrochemical, electrochemical, electrochemical, electrochemical, demichele, electrochemical, astronomical, carmical, carmickle, comical, demichele, economical, electrochemical, inimical, uneconomical
electrochemical, electrochemical, electrochemical, electrochemical, demichele, electrochemical, astronomical, carmical, carmickle, comical, demichele, economical, electrochemical, inimical, uneconomical