The safety of nuclear reactors is very important.

Nuclear fission is a powerful phenomenon that generates energy.

The atomic weight of helium is 4.

He is dedicated to the study of immunochemistry.

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

This chemical reaction is very dangerous.

This shirt is made of chemical fiber.

The use of chemical weapons is prohibited by international law.

I am majoring in biochemistry at university.

I love organic chemistry classes.