Alkenes and Alkanes 0.0 / 5 ? ChemistryFunctional groups: Alkanes, alcohols, carboxylic acids and estersGCSEAQA Created by: SunsetCreated on: 13-05-13 19:04 What is an alkene? A hydrocarbon with one or more C-C double bonds 1 of 12 What is the general formula for alkenes? CnH2n 2 of 12 Which are unsaturated: alkenes or alkanes? Alkenes 3 of 12 What are the properties of short chain alkanes? They are gases at room temperature because they have low boiling points. They ignite easily so they are volatile. They are not viscous. 4 of 12 Why are long chain alkanes viscous? The long chains get tangled reducing their runniness. 5 of 12 How do you test whether a hydrocarbon is an alkane or an alkene? Add bromine water. If it turns colourless it is an alkene. 6 of 12 Why does bromine water turn colourless in alkenes? The alkene reacts with the bromine because alkenes are unsaturated. 7 of 12 What kind of reaction is cracking? Thermal decomposition 8 of 12 What are the products of the cracking of long chain alkanes? An alkane and alkene 9 of 12 Why are short chain alkanes in higher demand than long chain alkanes? Long chain alkanes don't burn well so they aren't good fueld whereas short chain alkanes are good fuels because they burn well 10 of 12 What is the name of the process in which many mononmers are turned into polymers Polymerisation 11 of 12 Plastic (polymers) are made from which kind of hydrocarbon? Alkenes 12 of 12
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