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Chapter 2: Chem-Is-Try

TOD: Methods box p.30 Fig 2.17 mimic molecules. Chapter 2: Chem-Is-Try. Elements and Compounds Chemical elements of life Atoms and Molecules Atomic structure and function Bonding and chemical reactions. Elements and Life. Define element: Compound: SPONCH CaK ( ONCH 96% )

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Chapter 2: Chem-Is-Try

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  1. TOD: Methods box p.30 Fig 2.17 mimic molecules Chapter 2: Chem-Is-Try Elements and Compounds Chemical elements of life Atoms and Molecules Atomic structure and function Bonding and chemical reactions

  2. Elements and Life • Define element: • Compound: • SPONCH CaK • ( ONCH 96% ) • Trace elements (Fe, I) • anemia, goiter—iodized salt, sea weed • Crops too—nitrogen, calcium

  3. Atoms and Molecules • Quick review: electrons, neutrons, protons, orbitals, nucleus • Atomic number • Atomic mass (mass number) • Dalton

  4. Helium

  5. Electron orbitals 1s 2s 2p (x, y, z)

  6. The major elements of life

  7. Covalent bonds Fig 2.10 (share electrons)

  8. Polar Covalent Fig 2.11Bonds * electronegativity

  9. Ionic bonds(electron transfer +/- ions)

  10. Hydrogen Bonds fig 2.14

  11. Structure / Function Examples Mimic molecules

  12. 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.

  13. 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.

  14. VIDEOS on the instructor’s disk

  15. Molecular shape Structure / Function Examples

  16. Fig 2.7 Energy Levels of Electrons • light• fluorescence• photo-synthesis Energy Absorbed Energy Lost

  17. Hierarchy of life

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