GCSE level organic chemistry exam revision notes: Part 11.

INDEX of notes on comparing different types of polymers: thermoplastics, thermosets and fibres - examples of synthetic condensation polymers & natural polymers including proteins, DNA, wood, silk, starch & cellulose (plus links to other polymer pages)

Answers to the Choosing a Plastic for a Particular Use Exercise in decision making

(a) Plastic B, to be disposable it must be cheap, chemical resistance doesn't matter (only in contact with food/drinks once), needs to be heat resistant, transparency doesn't matter?, needs to be reasonably rigid.

(b) Plastic E, firstly, it must be very strong to withstand the physical movement and friction in a working machine, it withstand heat from friction, chemical resistance need not be high, high cost acceptable for a specialised non-disposable part of a machine.

(c) Plastic F, needs to be reasonably cheap but heat and chemical resistant.

(d) Plastic A, it needs to be transparent to read the calibration marks accurately, it needs to be chemically and heat resistant to safe to use in the laboratory, it needs to be rigid to retain its accuracy, the high cost would be acceptable for a valuable measuring instrument in the laboratory, its not disposable.

(e) Plastic C, most important that it can be made into fibres, chemical and heat resistance is the responsibility of the owner/wearer!, needs to opaque or it becomes a 'see through'!

(f) Plastic D, the plastic needs to cheap, flexible and disposable (low cost), heat and chemical resistance are not important - responsibility of user!

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All my revision notes on polymers GCSE and A level