Alkanes and Alkenes 0.0 / 5 ? ChemistryOrganic ChemistryIGCSEEdexcel Created by: MegganCreated on: 24-09-13 21:19 What's a hydrocarbon? Molecules containing hydrogen and carbon atoms ONLY 1 of 20 What are 3 features of a homologous series? 1) same general formula 2) trends in physical properties 3) same chemical properties 2 of 20 What does saturated mean? SINGLE bonds 3 of 20 What sort of bonds do alkenes have? Double covalent bonds 4 of 20 Which are more reactive; alkanes or alkenes? Alkenes - double bond can be 'opened up' 5 of 20 General formula for alkanes? Cn H2n+2 6 of 20 General formula for alkenes? Cn H2n 7 of 20 What is an Isomer? Something with the same molecular formula, but different structual forumla 8 of 20 What 2 reactions do alkanes do? 1) Combustion 2) Substitution reactions 9 of 20 What products are made in complete combustion? (plenty of oxygen) Carbon dioxide and water (+lots of energy) 10 of 20 What products are made in incomplete combustion? (little oxygen) Carbon, carbon monoxide, carbon dioxide, water (+little energy) 11 of 20 Where do alkanes get their energy from in substitution reactions? U.V. light 12 of 20 What are the products of reacting methane with the halogen bromine? Bromomethane + hydrogen bromide 13 of 20 What sort of reactions do alkenes undergo? Addition Reactions 14 of 20 What product do you get when reacting ethene and bromine? 1,2 - Dibromoethane 15 of 20 What's the test for alkenes? Decolourising bromine water from reddish-brown to colourless 16 of 20 Why do we crack hydrocarbons? To get shorter hydrocarbon chains as they are more useful 17 of 20 What sort of reaction is cracking? Thermal Decompositon 18 of 20 What conditions are needed for cracking? 600-700 degrees C, and a catalyst e.g. alumina or silica 19 of 20 How do you pass the large hydrocarbons over a catalyst in cracking? Vaporise them 20 of 20
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