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Number of moles of solute per litre of solution.

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Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Fractional Distillation

The process in which a fractioning column is used in distillation apparatus to separate components of a liquid mixture that have different boiling points.

Substitution Reaction

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

Fast Neutron

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

Gel

Colloidal suspension of a solid dispersed in a liquid, a semirigid solid.

Greenhouse Effect

Trapping of heat at the surface of the earth by carbon dioxide and water vapour in the atmosphere.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Square Planar

A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.