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Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

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Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Dimer

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

Binary Compound

A compound consisting of two elements, may be ionic or covalent.

Photochemical Smog

A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.

Reducing Agent

The substance that reduces another substance and is oxidized.

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).

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Excited State

Any state other than the ground state of an atom or molecule.