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Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

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Saccharate

A compound formed by interaction of sucrose with a metallic oxide, usually lime, and useful in the purification of sugar.

 

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Polarimeter

A device used to measure optical activity.

Plasma

A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Helium

Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4

Atomic Radius

Radius of an atom.

Vapor

A gas formed by boiling or evaporating a liquid.

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.