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

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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.

Bonding Pair

Pair of electrons involved in a covalent bond.

Energy

The capacity to do work or transfer heat.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Extensive Property

A property that depends upon the amount of material in a sample.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.