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The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

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Coordination Sphere

The metal ion and its coordinating ligands but not any uncoordinated counter-ions.

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Cloud Chamber

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

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Why do copper products change color, and what is the name of the process?

Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.