Combination of symbols that indicates the chemical composition of a substance.
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Flotation
Method by which hydrophobic (water-repelling) particles of an ore are separated from hydrophilic (water-attracting) particles of a metallurgical pretreatment process.
Rate-determining Step
The slowest step in a mechanism, the step that determines the overall rate of reaction.
Chain Termination Step
The combination of two radicals, which removes the reactive species that propagate the change reaction.
Alkali Metals
Metals of Group IA (Na, K, Rb).
Molecule
The smallest particle of an element or compound capable of a stable, independent existence.
Combination Reaction
Reaction in which two substances (elements or compounds) combine to form one compound.
Positron
A Nuclear particle with the mass of an electron but opposite charge.
Geometrical Isomers
Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.
Zone Refining
A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.
Optical Activity
The rotation of plane polarized light by one of a pair of optical isomers.
