1) Allotrope is two or more forms of an element in the same state that have distinctly different physical and or chemical properties.
2) Two elements other than carbon that form allotropes are oxygen and phosphorous.
3) a) They have different appearance and structures.
b) Because of how the atoms of the elements are linked and organized.
c) Diamond is expensive due to its quality and optical characteristics.
4) Engineered materials differ from natural materials because they are efficient and renewable.
5) Tow advantages of using engineered ceramics in high - temperatures applications are higher melting point and because are strong at high temperatures. Two disadvantages are they are brittle and can fracture.
6) Tow examples of properties that can be modified in plastics to make them useful for new applications are that you can craft plastic to be harder or softer and that plastic optical fibers can be altered for use and transmission.
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