He and I went to see a movie together.

I ate one apple.

He is the best student in the class.

I went to see a movie alone.

Unsaturated fatty acids are said to be good for health.

The pH of this liquid is 7.

Arsine is a colorless, odorless, and highly toxic gas.

Lithium hydride plays an important role in chemical reactions.

Hydrogen peroxide is often used for disinfecting wounds.

Tritium is one of the radioactive isotopes.