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Structures of a compound that differ by the extent of rotation about a single bond.

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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.

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

Buffer Solution

Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.

Chemical Change

A change in which one or more new substances are formed.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.

Lanthanides

Elements 58 to 71 (after lanthanum).

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Octane Number

A number that indicates how smoothly a gasoline burns.

Matter

Anything that has mass and occupies space.

Ligand

A Lewis base in a coordination compound.