Soybeans are rich in isoflavones.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

Hydrogen is the most abundant element in the universe.

Hydrocarbons are fundamental components of organic chemistry.

Lithium hydride plays an important role in chemical reactions.

Hydrogen peroxide is often used for disinfecting wounds.

He was involved in the development of the hydrogen bomb.

The pH of this liquid is 7.

Hydrocyanic acid is a very dangerous chemical.

It suddenly started raining.