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 added sugar to his coffee.

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

My mother wakes me up every morning.

Every morning, my mother wakes me up at 6 o'clock.

He caused a big commotion.

I go to wake up the children every morning.