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Engineering Material
Test 1 Short Answer
Question | Answer |
---|---|
Explain why metals make good conductors of heat and electricity | When they bond, the electrons in the bonding are shared among one another, forming a "sea" of electrons. |
What are the 4 classes of materials? | Polymers Metals Ceramics Composites |
What three things are essential for diffusion to occur? | Space Time Energy |
Name 5 Hidden costs in the cost of a product (there are PLENTY of answers to this not listed in the answer) | Labor Materials Transportation Taxes Inspections (Safety) |
Why does interstitial diffusion happen faster than vacancy diffusion? | The bonding of interstitials to the surrounding atoms is normally weaker and there are many more interstitial sites than vacancy sites to jump to |
Sketch and Label the relationship between the 4 components of the material selection process. | Processing -> Structure -> Properties -> Performance |
What is a stable electron configuration and how does it influence the reactivity of an element? | When all the electron orbitals are full, a stable electron configuration has been created. Examples include the Noble gases (inert as a product of there stable configurations)...because they don't seek interaction, they aren't reactive. |
Draw and completely label the Energy trough. (not a drawing, but answer listed is important) | Labels on diagrams: Force F Attraction w/arr. Repulsion w/arr. Attractive Force, F_A Net Force, F_N Repulsive Force, F_R r_0 interatomic separation r Potential Energy E Rep. Energy, E_R Net Energy, E_N Attr. En., E_A Bond. En., E_0 |