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An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.

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Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Linear Accelerator

A device used for accelerating charged particles along a straight line path.

Salicylaldehyde

An oily, slightly water-soluble liquid, C7H6O2, having an almondlike odor: used chiefly in perfumery and in the synthesis of coumarin.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Three ways to make patina at home

The first way is ammonia patination. To do this, take a plastic container. Put a couple of paper or ordinary towels at the bottom. Moisten them with ammonia. Then sprinkle with large table salt.

Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Primary Standard

A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.

Alkaline Battery

A dry cell in which the electrolyte contains KOH.

Basic Salt

A salt containing an ionizable OH group.

Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.