Organic compounds • Friedrich Wohler used ammonium cyanate to synthesize urea • States, densities, m.p. and b.p. explained by London dispersion forces, non-polar • Uses of organic compounds: heat/electrical energy, industry chemical synthesis (plastics, synthetic fibres, medicines), non-renewable source of fuel • Fractional distillation: separation by different boiling temperatures Unsaturated hydrocarbons • Formed during cracking of crude oil Molecular structures • Aromatic compounds: planar • Methane: tetrahedral • Ethene: trigonal planar • Ethyne: linear Cyclic compounds • Cycloalkanes, cycloalkenes, aromatic compounds Alkenes • Have geometric isomers – same molecular formula but position of groups differ with regard to the double bond
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