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Refers to crystals having the same atomic arrangement.

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Gas of rotten eggs

If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.

Saccharic acid

A white, needlelike, crystalline, water-soluble solid or syrup, C6H10O8, usually made by the oxidation of cane sugar, glucose, or starch by nitric acid. Also called "Glucaric acid."

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

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.

 

Electrical Conductivity

Ability to conduct electricity.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Supercooled Liquids

Liquids that, when cooled, apparently solidify but actually continue to flow very slowly under the influence of gravity e.g glass.

Semiconductor

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

Periodic Table

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