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A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

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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.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

Ioniztion

The breaking up of a compound into separate ions.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Specific Gravity

The ratio of the density of a substance to the density of water.

Strong Electrolyte

A substance that conducts electricity well in a dilute aqueous solution.

 

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Pineapple literally "erodes" the tongue

Everyone who has ever tried fresh pineapple knows that if you eat too much, your lips and tongue hurt for a while. This is because the pineapple contains an enzyme called bromelain. This enzyme literally "erodes" the tongue.