Chemistry - Hydrocarbons 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: LunaShomeiRoseCreated on: 01-12-18 16:56 What are hydrocarbons made from? Contains only hydrogen and carbon (don't forget ONLY in exam!) 1 of 22 What do properties of the hydrocarbon depend on? Size of molecule 2 of 22 You can either have long or short ___ of hydrocarbons Chains 3 of 22 Longer chains have (more/less?) carbon more 4 of 22 Longer chains have a ___ boiling point then smaller chains Higher 5 of 22 __ chains are more volatile (easier to evaporate) shorter/smaller 6 of 22 ___ chains are more viscous (how hard it is to flow) Longer/bigger 7 of 22 Short chains are ___ to ignite easy (clean flame) - More flammable 8 of 22 Longer chains are harder to ignite (less flammable) and produce more ___ (incomplete combustion) smoke 9 of 22 Which hydrocarbons are better for fuel? smaller/lighhter 10 of 22 a hydrocarbon (e.g ethene) can react with __ in complete combustion to burn fuel oxygen/air/O2 11 of 22 The hydrogen and carbon in fuel have been o_____ completely (complete combustion) oxidized 12 of 22 This reaction is good for fuel because it is __othermic exothermic - produces lots of energy 13 of 22 Products of complete combustion reaction with hydrocarbons are only __ and __ Carbon dioxide and water 14 of 22 Incomplete combustion occurs when they're a lack of __ Oxygen/air 15 of 22 An incomplete combustion reaction with hydrocarbons and water would produce the same CO2 and H2O, but would also produce... and.... carbon monoxide and carbon (soot) 16 of 22 ___ energy is produced in this reaction then complete combustion less 17 of 22 carbon monoxide is _____less and ____less colourless and odourless 18 of 22 Why is it dangerous? Replaces Oxygen in red blood cells, reducing overall amount of oxygen, making us sleepy/unconscious or even lead to death 19 of 22 Why is soot dangerous? Blocks exhaust pipes, damage engine or boiler, can blacken buildings, get in lungs (breathing problems) 20 of 22 incomplete combustion occurs when there's a limiting supply of... oxygen/air/O2 21 of 22 what two products are produced from complete combustion? CO2 (carbon dioxide) and H2O (water) 22 of 22
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