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

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Active Metal

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

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.

Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Helium

Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.