http://en.wikipedia.org/wiki/Alkane
http://www.daviddarling.info/encyclopedia/A/alkane.html
http://en.wikipedia.org/wiki/Homologous_series
http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Properties-of-Alkanes-917.html
http://www.wou.edu/las/physci/ch334/lecture/lecture6.htm
http://www.britannica.com/facts/5/1003200/viscosity-as-discussed-in-hydrocarbon-chemical-compound
http://www.goiit.com/posts/show/813835/isomerism-isomerism-804382.htm
http://en.wikipedia.org/wiki/Methane
http://en.wikipedia.org/wiki/Alkene
http://www.elmhurst.edu/~chm/vchembook/503alkenes.html
http://www.chemguide.co.uk/organicprops/alkenemenu.html
http://www.ucc.ie/academic/chem/dolchem/html/dict/alkenes.html
http://www.science-resources.co.uk/KS3/Chemistry/Chemical_Reactions/Hydrocarbons/Alkanes_and_alkenes.htm
