C9

• Hydrocarbon contains hydrogen and carbon atoms only
• Alkanes are saturated as it contains as many hydrogen atoms as possible
• Larger the molecule the higher the boiling point of the hydrocarbon
• Smaller molecule=low bpt=lower viscosity=very flammable
• In fractional distillation, the bottom is much hotter than the top.
• Test for water use blue cobalt chloride paper which will turn pink
• Incomplete combustion may produce carbon monoxide
• when hydrocarbons burnt why produce carbon dioxide and water
• Boiling point of hydrocarbon depends on the size of the molecule
• Steam cracking ; heating mixture of hydrocarbon vapours and steam to very high temp
• Catalytic cracking ; passing hydrocarbon vapours over a hot catalyst
• Alkenes with smaller molecules are more useful as fuels
• During cracking, thermal decompositions reactions produce smaller molecules