ALKANES AND ALKENES 0.0 / 5 ? ChemistryPolymersProperties of hydrocarbonsGCSEAQA Created by: noahhyams-ssekasiCreated on: 01-08-16 13:01 How do you split up long-chain hydrocarbons? Cracking 1 of 12 What type of reaction is cracking? Thermal decomposition 2 of 12 Explain the cracking process HEAT long-chain hydrocarbon to VAPORISE it, pass the vapour over a HOT CATALYST 3 of 12 What are the products of cracking? Alkanes and Alkenes 4 of 12 Why is an alkene an unsaturated hydrocarbon? It has a C=C double bond 5 of 12 What is special about the C=C double bond? The double bond can open up which allows the two carbon atoms to bond with other atoms 6 of 12 What are the first five alkenes? Methene, Ethene, Propene, Butene, Pentene 7 of 12 What is the general formula for alkenes? CnH2n 8 of 12 How can you test for an alkene? Adding bromine water - if the bromine water turns from orange to colourless, an alkene is present 9 of 12 How do you make ethanol? HYDRATION - react ETHENE with STEAM in the presence of a CATALYST 10 of 12 How can we produce ethanol from renewable resources? FERMENTATION - convert SUGAR in to ETHANOL using YEAST 11 of 12 What is the word equation for fermenation? Sugar -> Carbon Dioxide + Ethanol 12 of 12
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