She called him by his name.

He is called the smartest in the class.

He often gets treated to dinner by his friends.

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.

What is this material made of?

He is an expert in chemistry.

Organic solvents play an important role in chemical reactions.

He called me back immediately after he hung up the phone.