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The point at which an indicator changes colour and a titration is stopped.

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Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

Distillate

The material in a distillation apparatus that is collected in the receiver.

 

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Specific Gravity

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

Buret

A piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).