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.

He is suffering from combat stress reaction.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

This soup made from boiled rice is very delicious.

His efforts were a drop in the bucket.