He was hiding the fact that he was an illegitimate child.

I'm sorry, but I don't speak Japanese.

I'm a Muslim, so I fast during Ramadan.

I'm Jewish.

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.

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

He is known as an expert in subcritical nuclear experiments.