TRUE OR FALSE please :) Polymers have only covalent bonding and no other type of
ID: 1766761 • Letter: T
Question
TRUE OR FALSE please :)
Polymers have only covalent bonding and no other type of bonding. Weight average molecular weight and number average molecular weight are the same. Teflon is the same structure as polyethylene but with one out of every four H replaced by F. Organic polymers have C-C bonding. Thermoset plastics are easily melted to form recycled products. Ceramics at room temperature can have both elastic and plastic deformation in tension if the stress is high enough. The lowest density structural metal is Mg. Ti is used in biomedical implants.Explanation / Answer
1) Polymers can have only covalent bonds. Ionic bonds cannot exist in polymers. Hence True
2) Number average depends on the number of molecules wheras weight average depends on the weight fraction. Since these two are different, the two averages cannot be the same . So False.
3) Teflon is Poly Tetra Fluoro Ethylene. Tetra means it has 4 F instead of 4 H. Each of the 4 H is replaced by F and not one out of 4. Hence False.
4) C-C bonding is the primary bond in organic polymers. Thus True.
5) The nature of thermoset plastics make them hard to melt and thus cannot be easily recycled. - So False.
6) Ceramics are highly brittle materials and break (permanent deformation) - Thus False
7) Magnesium is the lowest density metal that can be used for structures - So True.
8) Titanium is used in biomedical implants - Ture
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