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Worksheets7.2&7.3
Total questions: 10
Worksheet time: 5mins
Which types of plastic can be used to make the plate and bowl?
melamine
epoxy
PVC
Which plastic can be used to made the window of aeroplane?
epoxy
perspex
bakelite
melamine
Bakelite is known as __________________________
thermosets
thermoplastics
Polythene is known as __________________
thermosets
thermoplastic
Thermoplastics can be ____________________________.
remoulded repeatedly
moulded only once
Thermosets can be _______________________.
remoulded repeatedly
moulded only once
Thermosets are ____________________
hard when they are cold
soft
Polymer chains are holded by cross-links which prevent polymer chains from sliding over one another.
The statement above is referred to _________________
thermosets
thermoplastic
Which is the proper way to manage the plastic?
Recycle
Open burning
Throw in the river
What are the disadvantages of disposal plastics?
air will become cleaner
environmental pollution
the river will become cleaner
