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A device for measuring pressure.

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Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.

 

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Theoretical Yield

Maximum amount of a specified product that could be obtained from specified amounts of reactants, assuming complete consumption of limiting reactant according to only one reaction and complete recovery of product.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

Percent by Mass

100% times the actual yield divided by theoretical yield.

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

Iron

Discovered : known to ancient civilisations.

Origin : The name comes from the Anglo-Saxon ‘iren’, and the symbol from the Latin ‘ferrum’, meaning iron.
Description :Iron is an enigma - it rusts easily and yet is the most important of all metals, world production exceeds 700 million tons a year. Small amounts of carbon are added to iron to produce steel and when chromium.
is added to this, the result is non-corroding stainless steel (small amounts of nickel may also be added). Iron is also an essential element for all forms of life. The average human contains about 4 grams, much of which circulates as haemoglobin in the blood, the job of which is to carry oxygen from our lungs to where it is needed. If the diet does not contain 10 milligrams a day, anaemia will eventually develop. Foods such as liver, kidney, molasses, brewer’s yeast, cocoa and liquorice contain a lot of iron.
Atomic No:26 Mass No:56

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Hydration

Reaction of a substance with water.

Daughter Nuclide

Nuclide that is produced in a nuclear decay.

 

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Specific Rate Constant

An experimentally determined (proportionality) constant, which is different for different reactions and which changes only with temperature, k in the rate-law expression: Rate = k [A] x [B]v.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.