AQA Chemistry unit 1 Other uses of crude oil

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GCSE Chemistry (Chemistry Unit 1) Flashcards on AQA Chemistry unit 1 Other uses of crude oil, created by Natalia Cliff on 17/05/2017.
Natalia  Cliff
Flashcards by Natalia Cliff, updated more than 1 year ago
Natalia  Cliff
Created by Natalia Cliff over 7 years ago
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Question Answer
What is cracking? Cracking is when hydrocarbons are split into smaller, more useful molecules
What is the process for cracking? -heat to vaporise hydrocarbons -pass vapours over a hot catalyst (usually steam) -This allows thermal decomposition to occur
What are the products of cracking? -alkanes (saturated) -alkenes (unsaturated)
What is the general formula and structure of alkenes? CnC2n
How do you test if a hydrocarbon is an alkene? The hydrocarbon is put into bromine water. If it is an alkene it will turn the orange bromine water colourless
What are the products of cracking useful for? -smaller alkanes useful as fuels -alkenes can be used as polymers
How are polymers made? Many smaller molecules (monomers) are joined to make a very large molecule (polymer). e.g. ethene can be made into poly(ethene) (the brackets are important)
How do you draw the structure of a polymer?
What are polymers used for? -packaging material -waterproof coating -fabrics -dental polymers -wound dressings -Hydrogels -smart materials (e.g. shape memory polymers)
What is an issue with polymers? Most polymers aren't biodegradable, so they are not broken down by microbes. This can lead to waste problems with landfill sites an litter
How is this issue being dealt with? Plastic bags are being made with polymers and cornstarch so that they break down more easily
How can ethanol be produced? -hydration of ethene with steam and a catalyst (high temp) -fermentation of sugar with yeast sugar -> carbon dioxide + ethanol
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