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The degree of polymerization, the average number of monomer units per polymer unit.

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Designated area

An area that may be used for work with carcinogens, reproductive toxins, or substances that have a high degree of acute toxicity. A designated area may be the entire laboratory, an area of a laboratory, or a device such as a laboratory hood.

Covalent Bond

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

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

What are Compound Microscopes?

Most of the microscopes used today are compound. A compound microscope features two or more lenses. A hollow cylinder called the tube connects the two lenses.

The top lens, the one people look through, is called the eyepiece. The bottom lens is known as the objective lens. Below the two lenses is the stage, with the illuminator below that.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.