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The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

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Noble Gases (Rare Gases)

Elements of the periodic Group 0, also called rare gases, formerly called inert gases, He,Ne,Ar, Kr, Xe, Rn.

Aromatic Hydrocarbons

Benzene and its derivatives.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Enantiomer

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

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.