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A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

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End Point

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

Aromatic Hydrocarbons

Benzene and its derivatives.

Electrophoresis

A technique for separation of ions by rate and direction of migration in an electric field.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Ozone

We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.