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A number that indicates how smoothly a gasoline burns.

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Hydrometer

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

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Oxide

A binary compound of oxygen.

Saccharate

A compound formed by interaction of sucrose with a metallic oxide, usually lime, and useful in the purification of sugar.

 

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Cell Potential

Potential difference, Ecell, between oxidation and reduction half-cells under nonstandard conditions.

 

Why do copper products change color, and what is the name of the process?

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.