styrene Search Term: styreneSource Category: ASSISTStyrene is on the Recommended Chemicals list for Australian schools. Synonyms: phenylethylene, styrene monomer, vinyl benzene, vinylbenzene; CAS Number: 100-42-5; Signal Word: Warning. Tags: 100-42-5phenylethylenestyrene monomerDecide variables to be changed and measured in fair tests, and observe measure and record data with accuracy using digital technologies as appropriate