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Rods of materials such as cadmium or boron steel that act as neutron obsorbers (not merely moderaters) used in nuclear reactors to control neutron fluxes and therfore rates of fission.

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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.

Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Phosphoric Acid

H3P04, Colorless liquid or rhombic crystals, decomposes before it will boil. Used mostly in the metal etchant. Used in cleaning operations to remove encrusted surface matter and mineral scale found on metal equipment such as boilers and steam producing equipment. Also used to brighten metals and remove rust.

Adsorption

Adhesion of a species onto the surfaces of particles.

xanthate

A salt or ester of xanthic acid. Many xanthates have a yellow color. Xanthates are used as flotation agents in mineral processing.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Salicylate

A salt or ester of salicylic acid.

Reaction Stoichiometry

Description of the quantitative relationships among substances as they participate in chemical reactions.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.