Karteikarten
polymers
Karten in diesem Stapel (17)
- 1polymersubstance of high average relative molecular mass made up of small repeating units
- 2monomerscombine to make a polymer
- 3alkenes can be used to make polymers such as polyethene by ADDITION POLYMERISATIONin this reaction - many small molecules (monomers) join together to create very large molecules (polymers)
- 4the repeating unit has the same number of atoms as the monomer becauseno other molecule is formed in this reaction
- 5monomers - have double bondsrepeating bonds
- has single bonds
- has (n) to signify large number of monomers and repeating units - 6poly(ethene)Properties - flexible, electrical insulator, cheap
ESE; plastic bags, bottles and ropes - 7Poly(chloroethene)properties : tough and cheap
Uses - window frames , water pipes - 8poly(propene)properties: flexible, strong, tough
USe ; crates, furniture - 9Poly(tetrafluoroethene)properties ; unreactive , tough, non stick
Uses : non stick pans , waterproof clothing - 10why are polyesters condensation polymersin condensation polymerisation, a small molecule is formed as a by product each time a bond is formed between two monomers
(alcohol + carboxylic acid functional group react) loosing a small molecule (WATER) - 11how are polyesters formedwhen a monomer molecule containing (2 CARBOXYLIC ACIDS) reacts with a monomer molecule containing (2 ALCOHOL GROUPS)
- 12what does the dicarboxylix acid looseOH group of each COOH group
- 13what does the di-alcohol looseH of the OH group
(remaining molecules - JOIN TO MAKE A POLYESTER) - 14what is produced each time an ester link is formedwater
(Oh and H group- COMBINE to make h20) - 15what are polymers made out ofCrude oil (finite) - will eventually run out
- the more we use up our crude oil resources - the more expensive crude oil
- crude oil is used for other different things too. As resources dry up, we will face the dilemma of how to use the remaining oil (way to stoop this is by recycling our polymers) - 16disadvantages of disposing polymersfilling up landfill sites . (non biodegradable)- sit in landfill for years
by combustion - burning plastics produces a lot of energy (used to generate electricity)
if not carefully controlled - toxic gases can be released from the combustion of plastics
- co2 is also produced (contributes to global warming) - 17—
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- Beschreibung
- GCSE Chemistry GCSE (paper 2) Karteikarten am polymers, erstellt von Ellaine Wahome am 17/06/2022.
- Erstellt von
- Ellaine Wahome
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