Understanding chemical equations is difficult.

We are growing vegetables without using chemical fertilizers.

Oxygen, which is one of the chemical elements, is necessary for us to breathe.

Understanding chemical equilibrium is very important in understanding chemical reactions.

This substance undergoes a chemical change when heat is applied.

In this experiment, you can observe a chemical reaction.

I found an old box in the storeroom.

The one-eyed goblin was dancing in the forest.

She was reading a book under the hazel tree.

He is struggling with a methamphetamine addiction.