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 will teach mathematics to new students tomorrow.

I attended a math class today.

The sourness of this lemon is very strong.

He is majoring in chemistry at university.

This chemical reacts when heat is added.

This chemical reaction is very dangerous.