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A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

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Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Hydrometer

A device used to measure the densities of liquids and solutions.

Radical

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

Features of the Scanning Tunneling Microscope

The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types.

The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The device is based on a complex process of "tunneling" electrons between the material and the tip of a probe.

Adsorption

Adhesion of a species onto the surfaces of particles.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Rate of Reaction

Change in the concentration of a reactant or product per unit time.