In this experiment, you can observe a chemical reaction.

This substance undergoes a chemical change when heat is applied.

Thermochemistry is a part of chemistry that deals with the reactions of heat and matter.

Chemotransmitters play an important role in the transmission of information between nerve cells.

He is an excellent pianist, besides, he is also an excellent composer.

He added sugar to his coffee.

It is important to adapt to changes in society.

His attitude changed.

I go to wake up the children every morning.

He caused a big commotion.