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A thin partition between two solutions through which certain molecules can pass but others cannot.

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Essential Oil

A plant extract that has a distinctive odour or flavour.

20 interesting chemistry facts

20 interesting chemistry facts.

Degenerate

Of the same energy.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Faraday's Law of Electrolysis

One equivalent weight of a substance is produced at each electrode during the passage of 96,487 coulombs of charge through an electrolytic cell.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Designated area

An area that may be used for work with carcinogens, reproductive toxins, or substances that have a high degree of acute toxicity. A designated area may be the entire laboratory, an area of a laboratory, or a device such as a laboratory hood.

Tetrahedral

A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.