In chemistry class, I learned about basic oxides.

You must not use cyanide in this chemical experiment.

We will use cyanide in this chemical experiment.

In chemistry class, I learned about acidic oxides.

I like to study new languages.

I attended a math class today.

I will teach mathematics to new students tomorrow.

In this chemistry experiment, we will learn about the dangers of cyanide compounds.

He is majoring in chemistry at university.

My trip has been postponed.