Chapter 2: Chem-Is-Try

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Chapter 2 Chem-Is-Try
TOD Methods box p.30 Fig 2.17 mimic molecules

• Elements and Compounds
• Chemical elements of life
• Atoms and Molecules
• Atomic structure and function
• Bonding and chemical reactions

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Elements and Life

• Define element
• Compound
• SPONCH CaK
• ( ONCH 96 )
• Trace elements (Fe, I)
• anemia, goiteriodized salt, sea weed
• Crops toonitrogen, calcium

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Atoms and Molecules

• Quick review electrons, neutrons, protons,
  orbitals, nucleus
• Atomic number
• Atomic mass (mass number)
• Dalton

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Helium
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Electron orbitals
1s 2s 2p (x, y, z)
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The major elements of life
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• Covalent bonds Fig 2.10 (share electrons)

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Polar Covalent Fig
2.11Bonds
electronegativity
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Ionic bonds (electron transfer /- ions)
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Hydrogen Bonds fig
2.14
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Structure / Function Examples
Mimic molecules
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T.O.D Radioactive Tracers in Bio.

• Label chemical substances within cells, are
  traceable
• Scientists can locate substances within an
  organism /or follow metabolic processes.

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Sources

• Campbell, Reece, Mitchell. Biology, 5th Ed.
  1999, Chap-ter one. Pgs. 1-21.
• Campbell, Reece, Mitchell. Biology, 5th Ed.
  1999, Presentations CD-ROM.
• Click art CD-ROM, Broderbund.

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• VIDEOS on the instructors disk

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Molecular shape Structure / Function Examples
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Fig 2.7 Energy Levels of Electrons light
fluorescence photo-synthesis
Energy Absorbed
Energy Lost
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Hierarchy of life
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