Term
| Major classes of materials |
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Definition
1. Metals
2. Ceramics
3. Polymers
4. Composites
5. Semiconductors |
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Term
| What makes metals good electrical conductors? |
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Definition
| They have free electrons. |
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Term
| How do metals resist brittle fracture? |
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Definition
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Term
| What are ceramics composed of? |
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Definition
| Metallic and non-metallic (usually oxygen) atoms. |
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Term
| Are ceramics crystalline? |
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Definition
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Term
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Definition
| No, bonding does not permit "free electrons". |
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Term
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Definition
| Long chain of molecules with repeating groups. |
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Term
| Which class of material can easily form into complex shapes? |
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Definition
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Term
| Which class of material is similar to ceramics? |
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Definition
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Term
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Definition
| 2 or more materials are combined. |
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Term
| Order of material types based on least strength to most strength |
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Definition
Polymers
Ceramics , Semiconductors
Composites
Metals |
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Term
| As ductility increases, strength _____ |
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Definition
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Term
| What kind of bonding do ceramics have? |
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Definition
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Term
| What kind of bonding do polymers have? |
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Definition
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Term
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Definition
| Metals are ductile because the atoms are able to roll over each other into new positions without breaking the metallic bond. |
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Term
| Why do metals conduct heat well? |
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Definition
| Metals conduct heat well b/c their electrons are delocalized and are free-moving so when they gain heat (energy), they vibrate more quickly and can move around. This means they can pass on energy more quickly. |
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