Biting one's own tail: the history of benzene

Benzene is one of chemistry's great stars. It has numerous applications, and is the basis for manufacturing many more useful compounds. But did you know its structure was a subject of a lot of controversy in the 19th century?

Video: The mole and Avogadro's number

The mole is defined as an amount of any substance that contains 6.023 X 10^23 atoms or molecules of that substance.

A tale of vinegar and hard water

If you live in an area where the water is hard, you may notice that when you wash utensils, a thin white stain is left behind. Did you know you can use vinegar to remove these stains?

Video: Balancing Chemical Equations

Have a tough time balancing chemical equations? This video will show you how.

Salvarsan & Prontosil: The beginning of modern medicine

Just a hundred years ago, drugs were expensive and had to be obtained from exotic tropical trees. This changed with the discovery of an artificial compound called Salvarsan. It cured the dreaded disease syphilis and laid the foundation of modern medicine.