In chemistry class, I learned about the reactions of acid anhydrides.

I learned about anhydrides in chemistry class.

This chemical reaction is very dangerous.

I like to study new languages.

I attended a math class today.

I will teach mathematics to new students tomorrow.

This chemical reaction is very dangerous.

This chemical reacts when heat is added.

The sourness of this lemon is very strong.

He is majoring in chemistry at university.