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12 Cards in this Set
- Front
- Back
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Metalloids(Semi-metals)
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elements that have physical and chemical properties of metals and non-metals. these elements are on the border between metals and non-metals.
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Semi-conductors
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elements that are normally not conductors but when combined with a trace amount of other elements they will conduct. they will also conduct electricity at high temperatures. e.g. silicon carbide, silicon and germanium
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Ionic Composition
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Ions are held together by strong ionic bonds
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Composition - Convalent Compounds
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Molecules with strong convalent bonds between atoms, but weak forces between molecules
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State at room temperature - Ionic
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Crystalline Solids together in a 3-dimensional lattice
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State at room temperature - convalent
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Most are liquids or gases owing to weak forces between molecules. few are low-melting point solids
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melting and boiling points - ionic
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high - strong ionic bonds require a lot of energy to break
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melting and boiling points - convalent
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low - weak intermolecular forces require little energy to break
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Solubility - Ionic
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Most are soluble in water but are insoluble in organic(convalent) solvents
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Solubility - Convalent
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Mostare soluble in organic solvents, e.g ethanol, but insoluble in water
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Electrical Conductivity - Ionic
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Conduct electricty when molten or dissolved in water, because ions are free to move, in the solid state they are in a crystal lattice and cannot carry the currents
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Electrical Conductivity - Convalent
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Do not conduct electricity in any state because no free ions or electrons are present to carry the current
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