This shirt is made of chemical fiber.

He likes to take a walk in the park at dusk.

He is spending a lot of time on experimental research.

She has an autoimmune disease.

My brother has been taking immunosuppressants after his transplant surgery.

The concept of chemical equivalent is essential for understanding chemical reactions.

My company specializes in the manufacture of fine chemicals.

Chemotransmitters play an important role in the transmission of information between nerve cells.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.

No chemical flavoring is used in this ramen at all.