We are growing vegetables without using chemical fertilizers.

This substance undergoes a chemical change when heat is applied.

In this experiment, you can observe a chemical reaction.

Understanding chemical equilibrium is very important in understanding chemical reactions.

He is an excellent chemist who made many discoveries.

This reaction occurs through a chemical process.

He is an expert in petrochemistry.

The study of organic compounds is an important field in chemistry.

He is good at geometry.

He is good at solving geometry problems.