Mark Each One True (T) or False (F)

33. Polymers have only covalent bonding and no other type ofbonding.

34. Weight average molecular weight and number average molecularweight are the same.

35. Teflon is the same structure as polyethylene but with oneout of every four H replaced by F.

36. Organic polymers have C-C bonding.

37. Thermoset plastics are easily melted to form recycledproducts.

38. Ceramics at room temperature can have both elastic andplastic deformation in tension if the stress is high enough.

39. The lowest density structural metal is Mg.

40. Ti is used in biomedical implants.

41. Wrought iron has less than 0.008 wt.% C and is very soft andeasy to form.

42. Cast iron has high amounts of carbon (2-4.5 wt.%) are isrelatively hard and brittle.

43. Stainless steels contain Cr to prevent corrosion.

44. The higher the hardenability, the more difficult it is for asteel to transform to martensite when quenched from an annealingtemperature.

45. Ceramics can have mixed ionic-covalent bonding.

46. In general, polymers are more ductile than metals.

47. The fracture stress for most polymeric materials is lowerthan most metals.

48. Polyvinyl chloride (PVC) is made with only Cl and Catoms.

49. SiO2 based glasses have an amorphous structure.