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.

In this experiment, you can observe a chemical reaction.

This substance undergoes a chemical change when heat is applied.

He is an excellent chemist who made many discoveries.

This reaction occurs through a chemical process.

Chemical pollution has a serious impact on the health of the Earth.

I am majoring in biochemistry at university.

My major is chemical engineering.