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soph kop Inglês 8 flashcards

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1Properties + Uses of PVC (Polyvinyl Chloride)Properties:
- Water & flame resistant
- Doesn't react with chemicals
- Doesn't conduct heat or electricity
- Decomposable
Uses:
- Insulation
- Drain pipes
2Properties + Uses of PolystyreneProperties:
- Heat, cold & electrical insulator
- Low density, lightweight
- Can be strengthened
Uses:
- coffee cups
- Insulator
- CD cases & containers
3LDPE- Contains branched chains
- Occurs under high gas pressure and temperatures.
- Initiation, Propagation, Termination
4HDPE- Consists of aligned/straight chains
- Occurs under low gas pressure and temperatures.
- Ionic catalyst e.g TiCl4
5INTRAmolecular-- WITHIN a molecule --
- Ionic
- Covalent
- Metallic
6INTERmolecularBETWEEN molecules
- Dipole dipole
- Dispersion
- Hydrogen bond
7Discuss the need for alternative sources of the compounds presently obtained from the petrochemical industry.- Over 95% of fossil fuels are burnt as a source of energy.
- Less than 5% is used as plastics and a small amount of plastics are recycled.
- Plastics from the petrochemical industry are NOT biodegradable.
- Can lead to environmental problems E.G Acid rain & green house effect
8Structure of cellulose & as a major component of biomass.- Cellulose has a zig-zag formation (increasing density & strength of molecule)
- Biomass is the material produced by living organisms.
- Cellulose, as fibre is widely found as biomass or plant material (grass, wood)