Soybeans are rich in isoflavones.

He is the type of person who understands ten from hearing one.

Excuse me, may I come in?

Lithium aluminium hydride is necessary for this chemical reaction.

The pH of this liquid is 7.

Hydrocyanic acid is a very dangerous chemical.

It suddenly started raining.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.