Flashcards
AQA Chemistry unit 1 Other uses of crude oil
Cards in this deck (12)
- 1What is cracking?Cracking is when hydrocarbons are split into smaller, more useful molecules
- 2What is the process for cracking?-heat to vaporise hydrocarbons
-pass vapours over a hot catalyst (usually steam)
-This allows thermal decomposition to occur - 3What are the products of cracking?-alkanes (saturated)
-alkenes (unsaturated) - 4What is the general formula and structure of alkenes?CnC2n
- 5How 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
- 6What are the products of cracking useful for?-smaller alkanes useful as fuels
-alkenes can be used as polymers - 7How 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)
- 8How do you draw the structure of a polymer?
- 9What are polymers used for?-packaging material
-waterproof coating
-fabrics
-dental polymers
-wound dressings
-Hydrogels
-smart materials (e.g. shape memory polymers) - 10What 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
- 11How is this issue being dealt with?Plastic bags are being made with polymers and cornstarch so that they break down more easily
- 12How 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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- GCSE Chemistry (Chemistry Unit 1) Flashcards on AQA Chemistry unit 1 Other uses of crude oil, created by Natalia Cliff on 17/05/2017.
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