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The smallest repeating unit of a substance. The molecule for nonionic substances

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Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

Foam

Colloidal suspension of a gas in a liquid.

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

20 interesting chemistry facts

20 interesting chemistry facts.

How to keep flowers in a vase for long time

The best gift for a woman, as you know, is a beautiful bouquet of flowers. But the cut flowers at home quite quickly wither. But your favorite roses or tulips can keep their freshness if you use our advice. Chemistry and various chemical elements will help us in this difficult matter!

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.