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Reactions in which two compounds react to form two new compounds, with no changes in oxidation number. Reactions in which the ions of two compounds exchange partners.

 

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Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

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.

Thermonuclear Energy

The energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m is mass, and c is the speed of light.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Isomers

Different substances that have the same formula.

Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

Percent Purity

The percent of a specified compound or element in an impure sample.

How to keep flowers in a vase for long time

The best gift for a woman, as you know, is a beautiful bouquet of flowers. But the cut flowers at home quite quickly wither. But your favorite roses or tulips can keep their freshness if you use our advice. Chemistry and various chemical elements will help us in this difficult matter!

Ioniztion

The breaking up of a compound into separate ions.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.