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A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

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Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Debye

The unit used to express dipole moments.

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

Pairing

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

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Specific Gravity

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

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Condensed States

The solid and liquid states.

Covalent Compounds

Compounds containing predominantly covalent bonds.