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Universities » Illinois Institute of Technology.. » MS - Materials Science » 201 - Materials Science » Flash Cards

MS 201 Midterm 1 - Flashcards

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Class:MS 201 - Materials Science
Subject:Materials Science
University:Illinois Institute of Technology
Term:Spring 2011
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Ionic Bonding is non specific. Any (-) ion attracts a (+) ion
Electrostatic Attraction Non-directional there for ions behave as spheres
Columbs Law Attractive force in the bond attracts them together
Covalent Bond Shares pair of electrons *Directionally Specific Covalent Solids Polymers: H H H H H H H C C C C C C C C C Polyethylene H H H H H H H *Adding a Cl after every 3rd H makes Polyvinyl chloride PVC *Adding a F instead of H makes Polytetrafluroethylene PTFE
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Diamond C C C C C C C C C C C C C C change C to Si we get a Silicon Crystal C C C C C C C change C to Ge we get a Germanium Crystal C C C C C C C This pattern isnt flat but at 109.5 degrees to each other.
Metallic bonding Valence electrons are donated to a common pool * * * * * * * * * * * * * * * * * * * * Valence Cloud!!! * * * * * * * * * * Consequences
Metalic Bonding 2 Consequences: 1) Electrical Conductivity because electrons move easily 2)Thermal Conductivity 3)Seaks electrons. Corrodes and oxidizes aka corrosion 4)
Radius Ratio's (R+r)/R=sin(theta) Radius ratio neighbors
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 Ionic Bondingis non specific. Any (-) ion attracts a (+) ion
 Electrostatic AttractionNon-directional there for ions behave as spheres
 Columbs LawAttractive force in the bond attracts them together
 Covalent BondShares pair of electrons *Directionally Specific
Covalent Solids
Polymers: H H H H H H H
C C C C C C C C C Polyethylene
H H H H H H H
*Adding a Cl after every 3rd H makes Polyvinyl chloride PVC
*Adding a F instead of H makes Polytetrafluroethylene PTFE
 DiamondC C C C C C C
C C C C C C C change C to Si we get a Silicon Crystal
C C C C C C C change C to Ge we get a Germanium Crystal
C C C C C C C
This pattern isnt flat but at 109.5 degrees to each other.
 Metallic bondingValence electrons are donated to a common pool

* * * * * * * * * *
* * * * * * * * * * Valence Cloud!!!
* * * * * * * * * *
Consequences
 Metalic Bonding 2 Consequences:
1) Electrical Conductivity because electrons move easily
2)Thermal Conductivity
3)Seaks electrons. Corrodes and oxidizes aka corrosion
4)
 Radius Ratio's(R+r)/R=sin(theta)



Radius ratio neighbors
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