Chemistry - Cracking Hydrocarbons 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: LunaShomeiRoseCreated on: 01-12-18 18:18 Lighter fractions (smaller chains) of crude oil are in high demand. Why? low boiling points, highly flammable, flow easily, evaporate easily, thin liquid/gas (larger fractions are basically opposite) 1 of 8 What does cracking do to larger molecules(hydrocarbons)? Breaks them down 2 of 8 This process involves ___ the heavier hydrocarbons heating(vaporising) 3 of 8 Then we can either pass over a hot c___ (breaking the chain) or mix with steam and heat to __ temp. catalyst. high temp 4 of 8 When we crack a hydrocarbon, we form.. smaller alkane and an alkene 5 of 8 the alkenes and alkanes formed are ___less, v___ substances colourless, volatile 6 of 8 We can use b___ water to distinguish the two bromine 7 of 8 What happens to alkene when it reacts with bromine water? it discolours it (goes colourless) because of the double bond making alkene more reactive than alkane 8 of 8
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