1. An allotrope is a different form of an element that has distinctly different physical or chemical properties.
2. Phosphorus and Oxygen
3. a. A diamond is the hardest substance known to man and very hard to find which makes it so expensive. Coal is very weak and fragile and cheap, Pencil lead is made of graphite and is very useful and every day life.
b. They are all allotropes of carbon.
c. The structure of the carbon atom is very unique and hard to find, which also relates to diamonds because they are very expensive and difficult to find.
4. Engineered materials are materials developed by scientists and engineers to enhance natural materials through manufacturing methods that carefully control the microstructure of the materials.
5. Ceramics are very durable and have very high melting points and are extremely strong at high temperatures. The only problem with ceramics is, if they are exposed to high tempuratures then suddenly to cold tempurature. With that, they are easily broken.
6. Plastics can be created to be either soft or hard. Plastic can also be made into optical fibers, which replace copper wires.
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