Lect_W8_151 weso(short)

Lect_W8_151 weso(short) - General Chemistry CHEM 151 Week 8...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 8
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UA GenChem Ionic Compounds: Properties Hard High Melting Very High Boiling Do not Conduct Electricity as solids, but conduct when melted ( ions then can move) Shatter when struck.
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UA GenChem In our model NaCl is made of Ionic compounds are high melting solids that do not conduct electricity. Our model predicts this since ionic compounds have positive and negative ions in a repeating pattern. Electrons are locked by strong coulombic forces on their ions and cannot move or “flow.” A Powerful Model
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UA GenChem IONIC COMPOUNDS SHATTER WHEN STRUCK WHY?
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UA GenChem . CHARGE is LOCALIZED ON THE IONS A Powerful Model
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UA GenChem Some things are gases . Some things are solids but conduct electricity and are malleable Copper Silver Gold Other Types of Substances Some things are liquids Water Alcohol Gasoline How do we explain it?
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UA GenChem Metallic Properties Hard High Melting Very High Boiling Conduct Electricity Can be pounded into shapes (Malleable) Can be pulled into wires (Ductile)
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UA GenChem All Na atoms- no ions only metal atoms in unit cell --- no ions Metals
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UA GenChem The individual atomic orbitals in a metal fuse together to make a free path for electrons The nuclei are fixed But there is an Electron “Sea” around them.
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