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Liquids that, when cooled, apparently solidify but actually continue to flow very slowly under the influence of gravity e.g glass.

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Basic Salt

A salt containing an ionizable OH group.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Lewis Acid

Any species that can accept a share in an electron pair.

Excited State

Any state other than the ground state of an atom or molecule.

Molecular Weight

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

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.

 

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Optical Activity

The rotation of plane polarized light by one of a pair of optical isomers.

 

Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Electrolysis

Process that occurs in electrolytic cells.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Ostwald Process

A process for the industrial production of nitrogen oxide and nitric acid from ammonia and oxygen.

Ionic Bonding

Chemical bonding resulting from the transfer of one or more electrons from one atom or a group of atoms to another.

Ionic Compounds

Compounds containing predominantly ionic bonding.