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Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.

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Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

Copper

Discovered : known to ancient civilisations
Origin : The name is derived from 'Cuprum', the Latin name for Cyprus.

Freezing Point Depression

The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.

yield

The quantity of product formed by the interaction of two or more substances, generally expressed as a percentage of the quantity obtained to that theoretically obtainable.

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Enzyme

A protein that acts as a catalyst in biological systems.

Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.