More resistant than metals, which is why they are used.
B.
Good heat, electricity and sound conductors.
C.
Contaminants, which is why they should not be burned
D.
Good heat, electricity and sound insulators.
3.
Plastics that are recycled to make other plastics are:
4.
Thermoplastics
A.
Are, for example, polyethylene, polypropylene and neoprene.
B.
Are formed by macromolecules in a linear or complex way.
C.
Can be re-processed various times like Thermosetting plastics
5.
Nylon:
A.
Is a synthetic fiber that is stronger than any natural fiber
B.
Is used to make jeans, shirts and socks.
C.
Is very stretchy.
6.
In the group of thermoplastics, one stands out as holding high temperatures. This plastic is called:
A.
PET
B.
PVC
C.
Polyvinyl
D.
Teflon
7.
PVC is often used for windows and their insulation, with regard to thermal and acoustic insulation. It has a bad reputation because
A.
The color changes with time
B.
It doesn't hold well against direct sun light
C.
It's fragile.
D.
Environmental problems due to additives like dust, Phthalate, * Substances added to plastics to increase their flexibility, transparency, durability, and longevity
