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Hydrocarbons that contain double or triple carbon-carbon bonds.

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Homogeneous Equilibria

Equilibria involving only one species in a single phase. For example, all gases, all liquids or all solids.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Dry Cells

Ordinary batteries (voltaic cells) for flashlights. radios, and so on, many are Leclanche cells.

Boron Hydrides

Binary compounds of boron and hydrogen.

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

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Polyene

A compound that contains more than one double bond per molecule.

Graham's Law

The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

Insoluble Compound

A very slightly soluble compound.