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13 Cards in this Set
- Front
- Back
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Properties of metals |
High boiling temps Good conductors Malleable and ductile |
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Relatively high boiling temperatures |
Strong electrostatic forces of attraction between positive metal ions and sea of delocalised electrons holds the metal lattice together |
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Good conductors because |
Free-moving delocalised electrons will move towards a positive electrode and away from a negative electrode in an electric circuit |
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Malleable and ductile because |
When a force causes metal ions to move past each other, layers of ions are still held together by delocalised electrons between them |
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Annealing |
Metal is heated to moderate temp and is allowed to cool slowly -softer, improved ductility, larger metal crystals |
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Quenching |
Metal is heated to moderate temp and cooled quickly -brittle, harder, tiny metal crystals form |
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Tempering |
Quenched metal heated (to lower heat than used for quenching ) and allowed to Cool -metal is harder, less brittle -intermediate size crystals |
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Properties of metals |
Lustrous/shiny Malleable Ductile Good conductors of electricity and heat Highly dense |
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Transition metals |
Harder Have higher density Higher melting points Less reactive, reactivity varies Smaller in size( greater core charge ) Stronger bonds |
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Ally |
Mixture of two of more metals Generally harder/ less malleable |
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Substitutional |
Made from elements that have fairly similar chemical properties & atoms of similar size |
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Interstitial |
Smaller atoms fit into the spaces between the larger atoms |
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Limitations of metallic bonding |
Magnetic nature Range of melting points and densities of different metals Incandescent |
