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A protein that acts as a catalyst in biological systems.

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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.

Canal Ray

Stream of positively charged particles (cations) that moves toward the negative electrode in cathode ray tubes, observed to pass through canals in the negative electrode.

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

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Bonding Pair

Pair of electrons involved in a covalent bond.

Electrophoresis

A technique for separation of ions by rate and direction of migration in an electric field.

Ionization Constant

Equilibrium constant for the ionization of a weak electrolyte.

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.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.