Of course it’s possible to get an MS/MA in chemistry without a BS/BA in chemistry.
My wife got a BA in biology and an MS in electrical engineering. One of my co-workers graduated with a BA in anthropology, and went on to get an MS in computer science. But that was years ago. It’s different now.
It’s difficult enough for applicants with BS/BA in chemistry to be admitted to MS/MA in chemistry programs. Think of how difficult it is for an application with BS/BA NOT in chemistry…