His role is the team leader.

Health is very important.

His opinion is very important.

This is an organic vegetable.

Sandwich compounds are being studied in a branch of chemistry.

In this chemistry experiment, we will learn about the dangers of cyanide compounds.

This inorganic compound plays an important role in chemical reactions.

This compound was made by the chemical combination of two different elements.

These two elements chemically combine to create a new substance.

He is majoring in chemistry at university.