Structural Isomerism 0.0 / 5 ? ChemistryIsomerismIsomerisation at the oil refineryAuto IgnitionOctane numbersASOCR Created by: EveKidneyCreated on: 02-01-15 16:04 What is the definition of a Structural Isomer? Structural Isomers have the same molecular formula but different structural formulae. 1 of 16 Name the 3 main types of Structural Isomerism 1. Chain Isomerism, 2. Positional Isomerism 3. Functional group Isomerism 2 of 16 When straight-chained alkanes are heated in the presence of a platinum catalyst, what do they become? Branched Alkanes 3 of 16 What do the branched-chained Alkanes have? Higher octane number and less tendency to auto-ignite 4 of 16 What is the definition of 'Auto-Ignition'? Is the explosion of a fuel without a spark 5 of 16 What does Auto-Ignition in a petrol engine cause? 1. A knocking sound 2. Reduced engine performance 3. Engine damage 6 of 16 What is the definition of an 'Octane Number' Octane number is a measure of the tendency of petrol to Auto-Ignite 7 of 16 What does a high Octane number mean? A low tendency to auto ignite 8 of 16 Do you want a high or low octane number in a petrol? High octane number 9 of 16 Short-Chain compounds have a ________ octane number than long-chain compounds Higher 10 of 16 Branched-chain compounds have a ______ octane number than the corresponding unbranched-chain compounds Higher 11 of 16 Do cycloalkanes have higher or lower octane numbers then the corresponding straight-chain alkanes? Higher octane number 12 of 16 Do Arenes have a higher or lower octane number than cyloalkanes? Higher octane number 13 of 16 Oxygenates have _____ octane numbers than Alkanes Higher 14 of 16 What is added to petrol to increase the octane number? Oxygenates 15 of 16 Name the 3 different chemical reactions used by the petrochemical industry to increase the octane number 1. Cracking 2. Reforming 3. Isomerisation 16 of 16
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