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Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

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Active Metal

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

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Oxidation Numbers

Arbitrary numbers that can be used as mechanical aids in writing formulas and balancing equations, for single- atom ions they correspond to the charge on the ion, more electronegative atoms are assigned negative oxidation numbers (also called Oxidation states).

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.

Alkali Metals

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

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Three ways to make patina at home

The first way is ammonia patination. To do this, take a plastic container. Put a couple of paper or ordinary towels at the bottom. Moisten them with ammonia. Then sprinkle with large table salt.

Galvanizing

Placing a thin layer of zinc on a ferrous material to protect the underlying surface from corrosion.