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Alkanes are insoluble in water, and have a lower density thus making them float atop water.  

Alkanes are insoluble in water, and have a lower density thus making them float atop water.  

When alkanes have more than three carbon atoms, they can be arranged in different ways, in a line or branched fashion. The different arrangements are called isomers, with standardized nomenclature to describe the isomeric forms. See [[IUPAC nomenclature]].  

When alkanes have more than three carbon atoms, they can be arranged in different ways, in a line or branched fashion. The different arrangements are called [[isomer]]s, with standardized nomenclature to describe the isomeric forms. See [[IUPAC nomenclature]].  

Linear chained alkanes with fewer than 4 carbon atoms have special names:

Linear chained alkanes with fewer than 4 carbon atoms have special names: