This place in the past stored unknown chemicals.

"You let individuals whom you have never met inject unknown chemicals into your body?"

Use your facilities here as though you were being asked to investigate an unknown chemical and to find out what it consists of.

From all she had read, it was probably too late, but there was a chance the unknown chemical wasn't lethal.

Qualitative chemistry is about the chemical reactions used to find out what an unknown chemical is.

He was killed in battle by Ryō, and afterwards an unknown chemical is discovered in his body.

"Coffee is a very complex beverage, in that there are so many known and unknown chemicals in coffee," he says.

They say that the explosion was due to hitherto unknown chemical or physical events for which it cannot be held responsible for failing to predict.

When chasing his ball he fell into a vat of an unknown chemical, but was quickly rescued by Krypto.

A search program compares unknown chemicals against records to identify chemicals not on the routine monitoring list.