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==Key Stage 4=====Meaning===A [[hydrocarbon]] is a [[Compound|chemical compound]] containing only [[carbon]] and [[hydrogen]] [[Atom|atoms]]. ===About Hydrocarbons===: [[Carbon]] [[atom]]s are able to form long chain [[molecule]]s so there are very large number of [[hydrocarbon]] [[molecule]]s.[[Hydrocarbon]]s can be split into two groups:*[[Alkane]]s - Which have only [[Single Bond|single bonds]] between [[Carbon]] [[atom]]s.*[[Alkene]]s - Which have one or more [[Double Bond|double bonds]] between [[Carbon Atom]]s.Small [[hydrocarbon]] [[molecule]]s are given names based on the number of [[Carbon]] [[atom]]s they contain:*Meth - 1 [[Carbon]]*Eth - 2 [[Carbon]]*Prop - 3 [[Carbon]]*But - 4 [[Carbon]]*Pent - 5 [[Carbon]]*Hex - 6 [[Carbon]]*Hept - 7 [[Carbon]]*Oct - 8 [[Carbon]]: [[Crude Oil]] is a [[mixture]] of hundreds of different [[hydrocarbon]] [[molecule]]s.