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Refers to chemical similarities in the Periodic Table of elements of Period 2 to elements of Period 3 one group to the right, especially evident toward the left of the periodic table.

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Specific Gravity

The ratio of the density of a substance to the density of water.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Dry Cells

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

Law of Conservation of Energy

Energy cannot be created or destroyed, it may be changed from one form to another.

Line Spectrum

An atomic emission or absorption spectrum.

Levorotatory

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

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Free Energy Change

The indicator of spontaneity of a process at constnt T and P. If delta-G is negative, the process is spontaneous.

yttrium metal

Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.