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

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  • 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...

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    Diamonds are still a girl's best friend, right? We love the shiny gems. They are the most popular rocks sold today. But what exactly are they, anyway? Where do they come from? What else are they used for?

  • 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...

  • Varieties of garnet minerals

    The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in...

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    Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.



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Corrosion

Oxidation of metals in the presence of air and moisture.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Basic Salt

A salt containing an ionizable OH group.

Salinometer

An instrument for measuring the amount of salt in a solution. Also,"salimeter, salometer."

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Solvation

The process by which solvent molecules surround and interact with solute ions or molecules.

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Avogadro's Number

The number (6.022x10^23) of atoms, molecules or particles found in exactly 1 mole of substance.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.