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Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Every chemical element has absorption lines at certain wavelengths corresponding to the differences between the energy levels of its atomic orbitals.

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Boiling Point

The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point

Polarimeter

A device used to measure optical activity.

Octane Number

A number that indicates how smoothly a gasoline burns.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Chemical Hygiene Plan (CHP)

A written program developed and implemented by an employer designating proceedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals usid in that particular workplace.

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Metathesis Reactions

Reactions in which two compounds react to form two new compounds, with no changes in oxidation number. Reactions in which the ions of two compounds exchange partners.

 

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

Flammable

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

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Equivalence Point

The point at which chemically equivalent amounts of reactants have reacted.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

xenon hexafluoride

A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

Fast Neutron

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

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Mass Action Expression

For a reversible reaction, aA + bB cC + dD the product of the concentrations of the products (species on the right), each raised to the power that corresponds to its coefficient in the balanced chemical equation, divided by the product of the concentrations of reactants (species on the left), each raised to the power that corresponds to its coefficient in the balanced chemical equation. At equilibrium the mass action expression is equal to K, at other times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K.

Dry Cells

Ordinary batteries (voltaic cells) for flashlights. radios, and so on, many are Leclanche cells.

Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.