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Describes processes that release heat energy.

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Insoluble Compound

A very slightly soluble compound.

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.