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The reaction in which hydrogen adds across a double or triple bond.

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Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Equivalence Point

The point at which chemically equivalent amounts of reactants have reacted.

Neutralization

The reaction of an acid with a base to form a salt and water. Usually, the reaction of hydrogen ions with hydrogen ions to form water molecules.

Degenerate

Of the same energy.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Structural Isomers

Compounds that contain the same number of the same kinds of atoms in different geometric arrangements.

Hund's Rule

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

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Matter

Anything that has mass and occupies space.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

Suspension

A heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introduction.

Solution

Homogeneous mixture of two or more substances.

Fossil Fuels

Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale.  For further information see Fuel Chemistry

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.