How to use "chemical" in a sentence

The room suddenly filled with the smell of some chemical

"Biological and chemical

got out of the chemical and biological weapons race a long time ago."

Lots of people out there in the rest of the world - they believe in chemical and biological warfare

And where it met with water, or even mist or wet grass, a chemical action took place and it turned into a powder that sank slowly and made room for more.