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Different forms of the same element in the same physical state.

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Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Barometer

A device for measuring pressure.

Hydrogen

Discovered : by Henry Cavendish in 1766.
Isolated in London, UK.
Origin : The name is derived from the Greek ‘hydro genes’, meaning water forming.
Description :A colourless, odourless gas that burns and can form an explosive mixture with air. It is currently manufactured from methane gas, but is also produced by the electrolysis of water and aqueous salts. The gas is used to make such key materials as ammonia, cyclohexane and methanol, which are intermediates in the production of fertilisers, plastics and pharmaceuticals. Some see hydrogen gas as the clean fuel of the future - generated from water and returning to water when it is oxidised. Hydrogen-powered fuel cells are increasingly being seen as pollution-free sources of energy.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Standard Molar Volume

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

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Bronsted-Lowry Acid

A proton donor.

Miscibility

The ability of one liquid to mix with (dissolve in) another liquid.

Distillation

The separation of a liquid mixture into its components on the basis of differences in boiling points. The process in which components of a mixture are separated by boiling away the more volitile liquid.

Law of Conservation of Matter

There is no detectable change in the quantity of matter during an ordinary chemical reaction.