Week 08 - GeneralChemistry CHEM151 Week 8 UA GenChem...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 8
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UA GenChem Week 8 Reading Assignment
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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. Electrons in Metals
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UA GenChem electrons electrons Electrons easily flow around the nuclei So metals CONDUCT ELECTRICITY Electric  Conductivity
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UA GenChem Metals are Malleable Whe n s truc k the  nuc le i m o ve  to ne w po s itio ns  b ut The  “ e le c tro n s e a ”  e a s ily a da pts Ele c tro ns  a re ve ry “de lo c a lize d”
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UA GenChem What about gases and liquids like water, oxygen, gasoline?
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Week 08 - GeneralChemistry CHEM151 Week 8 UA GenChem...

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