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Chemistry of Life

Chemistry of Life. Matter is recycled and rearranged for living organisms. Living matter is made up of different substances. Example of substances: pure CO 2 , glucose, pure salt, H 2 O…. CO 2. glucose. Atoms - Smallest unit of an element (with properties of that element).

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Chemistry of Life

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  1. Chemistry of Life

  2. Matter is recycled and rearranged for living organisms • Living matter is made up of different substances. • Example of substances: pure CO2, glucose, pure salt, H2O….. CO2 glucose

  3. Atoms - Smallest unit of an element (with properties of that element) • Nucleus-dense center containing: • Protons- positively charged particles • Neutrons- particles with no charge • Electrons (e-) - small, negatively charged particlesthat orbit nucleus in clouds or shells (2, 8, 8) • Valence e-- found in outermost energy level How many total e-? How many valence e-? What element?

  4. A=P=E M=A+N Atomic number = Proton number = Electron number Mass = Atomic Number + Neutrons

  5. Check for Understanding • How would an element’s identity change if you took away or added protons?

  6. The 17 essential elements in plants (autotrophs)… CHOPKINS Ca Fe Mg B Mn Cu Zn Mo Cl Carbon, Hydrogen, Oxygen, Phosphorous, Potassium, Iodine, Nitrogen, Sulfur, Calcium, Iron, Magnesium, Boron, Manganese, Copper, Zinc, Molybdenum, Chlorine C HOPKINS Café Managed by my cousin Mo Cline

  7. 96% of living matter: C, H , O, and N • 4% of living matter: Ca, K, P, S, Na, Cl, Mg, Fe, and trace elements

  8. Check for Understanding Hypothesize as to why these elements are near the top of the periodic table. (answer in the left margin)

  9. Atoms, Molecules and Compounds

  10. Molecules and Compounds • Molecule- 2 or more elements joined together by chemical bonds • smallest unit of a compound

  11. Chemical reactions 6CO2 + 6H2O  C6H12O6 + 6O2 • Lead to changes in substance or matter. • Occurs when electrons are transferred between two atoms (lost, gained or shared)

  12. Drawing Atoms • As scientists, we want to be efficient • Instead of drawing all of the electron shells, we only need to draw the valence electrons • A Lewis Dot diagram will make drawing molecules and compounds easier

  13. Lewis Dot Diagrams • The inner shells are not involved in bonding, so we can ignore them • Carbon is in group 14, so that means 4 valence electrons • We only need the element symbol and the valence electrons

  14. You try… What does the Lewis dot diagram look like for Oxygen? What does the Lewis dot diagram look like for Sodium? Hydrogen? How about Lithium? Why are they all the same? Na H Li

  15. Ions = electrically charged matter • Ions form when electrons are lost or gained. • Ionic bonds form when a positive ion is attracted to a negative ion.

  16. Making Salt…Lewis dot style (Ionic bond)positive Na+ attracted to negative Cl-

  17. Covalent bond = two atoms sharing electrons • “Strong” • Relatively stable • Hydrogen, oxygen, and nitrogen can readily form covalent bonds with carbon.

  18. Hydrogen Bonding • Weak bonds between a hydrogen of one molecule to an adjacent negative molecule • Ex: attraction between water molecules.

  19. Mixtures Physical combinations of substances • There are several types of mixtures: • solutions • suspensions • Colloids, or colloidal dispersions

  20. Mixtures Physical combinations of substances Air = solution Cytoplasm = colloid Kool-Aid= solution Jello = colloid Blood = suspension

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