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Name three uses for polythene?
Plastic bags, squeezy bottles, lunch boxes.
List three reasons for use of polythene.
Strong, cheap and flexible.
Name three examples of use of rigid pvc?
Pipes and gutters, window frames and curtain rails.
List three reasons for use of rigid pvc.
strong, long lasting, weather resistant.
Name three examples of use of flexible pvc?
insulation for electrical wires, hosepipes, shower curtains.
List three reasons for use of flexible pvc.
strong, long lasting, electrical insulator.
Name three examples of use of polystyrene?
food containers, yoghurt pots, electrical components.
List three reasons for use of polystyrene.
Strong (but brittle), rigid, electrical insulator.
Name three examples of use of expanded polystyrene (aeroboard)?
Packaging, house wall insulation, disposable coffee cups.
List two reasons for use of expanded polystyrene (aeroboard)
extremely low density, good heat insulator.
Name three examples of use of nylon?
Tights, ropes, and brushes.
List three reasons for use of nylon.
Can be spun into fibres, hard-wearing, 'slippery'
What are plastics?
Plastics are man made materials
What are pastics made from?
Most are made from crude oil which is a thick black smelly liquid but for use crude oil must be refined.
What is a catalyst?
A catalyst is a substance that speeds up chemical reactions but is not used up.
What is Cracking?
Atfer fractional distillation of crude oil lots of large molecules are left.
What is known as Catalytic Cracking?
Large molecules are broken down into smaller more useful molecules by heating them over a catalyst.
What is polymessation?
NB: Making of plastic from crude oil involves 2 stages.
1. Production of monomess from curde oil during cracking.
2 The joining together of these monomess to make polymess.
Polymessation is the joining together of monomero to make polymess.
Why is there so much plastic.? ( 7 reasons)
- 1. Cheap to make. 2 Easy moulded into shape.
- 3. Easy to maintain as it does not corrode.
- 4. Designed for different uses.
- 5. Insulator for heat and electricity.
- 6. Different colours. 7. Low density easy to work with.
Name the properties of polythene.?
- High density - hard and rigid. eg . dustbin.
- Low density - soft and flexible eg. plastic bags.
Name two categories of heating plastics?
Thermoplastics and thermosetting plastics.
Soften easily on heating . Can be easily remoulded.
Explain thermosetting plastics.?
Do not soften on heating. They are hard and rigid.