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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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Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Potential Energy

Energy that matter possesses by virtue of its position, condition or composition.

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.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Polydentate

Refers to ligands with more than one donor atom.