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A sample of matter composed of two or more substances, each of which retains its identity and properties.

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Molecular Orbital Theory

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

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Enantiomer

One of the two mirror-image forms of an optically active molecule.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Insulator

Poor electric and heat conductor.

Isoelectric

Having the same electronic configurations.

Reaction Ratio

The relative amounts of reactants and products involved in a reaction, maybe the ratio of moles. millimoles, or masses.

 

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Aromatic Hydrocarbons

Benzene and its derivatives.

xylose

A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Condensation

Liquefaction of vapor.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Foam

Colloidal suspension of a gas in a liquid.

Greenhouse Effect

Trapping of heat at the surface of the earth by carbon dioxide and water vapour in the atmosphere.

Solute

The dispersed (dissolved) phase of a solution.

Tyndall Effect

The scattering of light by colloidal particles.

Rate-law Expression

Equation relating the rate of a reaction to the concentrations of the reactants and the specific rate of the constant.