Chemistry - Chapter 4 (P3) + Chapter 5 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: rebeccamariaCreated on: 01-04-15 15:01 What does cracking mean? Spiltting up long-chain hydrocarbons 1 of 18 Why is cracking used? Cracking is used to turn longer chains into smaller ones 2 of 18 What do you need to make cracking? Heat and a catalyst 3 of 18 Cracking is a ______________ _______________ reaction. Thermal decomposition 4 of 18 What are alkenes? Alkenes are hydrocarbons; with a double bond 5 of 18 Are alkenes saturated or unstaurated? They are unsaturated 6 of 18 Name the first four alkenes Ethene, propane, butene, pentene 7 of 18 How can you test for an alkene? Bromine water 8 of 18 What is thermal decomposition? Breaking down a substance using heat 9 of 18 What do alkenes have that alkanes don't? They have a double bond 10 of 18 What happens to the bromine water, when alkene is added? Decolourise; which shows that it is an alkene 11 of 18 Why can polymers be difficult to dispose of? They do not break down easily (not biodegradable) 12 of 18 What is formed when ethene reacts with steam? Only Ethanol 13 of 18 What is one of the advantages of making ethanol by fermentation? The plant material is a renewable resource. 14 of 18 Properties of plastics Light weight, high resistance to various chemicals, unreactive 15 of 18 Why are plastics useful? Their unreactivity makes them durable 16 of 18 Why are plastics a problem? They are not biodegradable 17 of 18 What are the three ways to dispose of waste plastics? 1) Landfill 2) Recycling 3) Combustion 18 of 18
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