1. Allotropes are different forms of an element that each have distinctly different physical or chemical properties but are in the same state.
2. Oxygen and silicon form allotropes.
3.
a. Diamond is a very hard substance, it is not a good conductor, it is colorless, and is very valuable and expensive. Coal is a cheap, powdery substance that is used for fuel. Graphite is another cheap substance that is black, a good conductor, and extremely soft.
b. Their properties are different because they are carbon allotropes and have varied atomic assortments and different structures.
c. Something is either expensive or cheap depending on it's usefulness, appearance, and quality.
4. Engineered materials are materials that were created by a scientist to have specific characteristics of interest through manufacturing methods while natural materials are uncontrolled and untouched by scientists.
5. Ceramics work well under high temperatures and have very high melting points, however they are brittle and can crack during rapid changes in temperature.
6. Creating plastic can create a lot of pollution, therefore finding a way to create plastic without polluting the air would be a very positive change. In addition, plastic melts very easily when in contact with high temperatures. If the melting point was higher, plastic would be much more useful.
No comments:
Post a Comment