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

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    Metals have been used by people since ancient times. All the time the process of obtaining them was improved, useful alloys of various metals appeared. Let’s look at interesting facts about metals.

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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.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Cis-

The prefix used to indicate that groups are located on the same side of a bon about which rotation is restricted.

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Autoionization

An ionization reaction between identical molecules.

Formula Unit

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

Barometer

A device for measuring pressure.