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A ternary compound containing H, O, and another element, often a nonmetal.

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Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Hydrogen

Discovered : by Henry Cavendish in 1766.
Isolated in London, UK.
Origin : The name is derived from the Greek ‘hydro genes’, meaning water forming.
Description :A colourless, odourless gas that burns and can form an explosive mixture with air. It is currently manufactured from methane gas, but is also produced by the electrolysis of water and aqueous salts. The gas is used to make such key materials as ammonia, cyclohexane and methanol, which are intermediates in the production of fertilisers, plastics and pharmaceuticals. Some see hydrogen gas as the clean fuel of the future - generated from water and returning to water when it is oxidised. Hydrogen-powered fuel cells are increasingly being seen as pollution-free sources of energy.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Aromatic Hydrocarbons

Benzene and its derivatives.

Allotropes

Different forms of the same element in the same physical state.

Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Saturated Solution

Solution in which no more solute will dissolve.