C9 - Crude Oils and Fuels. 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: ethannnnnnnnnCreated on: 04-12-17 16:43 C9 - Crude Oils and Fuels. C9 - Cude oil and fuels. 1 of 6 C9.1 - Hydrocarbons. Contain hydrogen and Carbon atoms. AlkAnes = saturated hydrocarbons. They contain as many hydrogen atoms as possible. Genral formula = CnH(2n+2) 2 of 6 C9.2 - Fractional distillation of oil... Crude oil - seperated into fractions in industry. properties depend on size of the hydrocarbon molecules in it. Lighter fractions = better as they ignite easier and burn well with cleaner flames. 3 of 6 Fractionall distilation. 4 of 6 C9.3 - Burning hydrocarbon fuels. when burnt in air, the hydrogen and carbon are COMPLETLEY oxidised. - They produce carbon dioxide and water. Tests; carbon dioxide - limewater cloudy. water- blue cobalt chloride paper pink. INCOMPLETE combustion produces carbon menoxide as a product. 5 of 6 C9.4 - Cracking hydrocarbons... Large hydrocarbons - small hydrocarbons = pass vapours over a hot catalyst, or mix with steam and heating them to a high temperature. Cracking makes saturated hydrocarbons, used for fuels and unsaturated hydrocarbons (alkEnes) AlkEnes and other unsaturated compounds with carbon - carbon double bonds react with orange bromine water and turn it colourless. 6 of 6
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