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Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

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Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Titration

A Procedure in which one solution is added to another solution until the chemical reaction between the two solutes is complete, the concentration of one solution is known and that of the other is unknown.

 

Hydrate

A solid compound that contains a definite percentage of bound water.

Ioniztion

The breaking up of a compound into separate ions.

Hydration

Reaction of a substance with water.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Enzyme

A protein that acts as a catalyst in biological systems.

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.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.