Biology3 Lab2

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Biology3 Lab2
2012-02-28 23:57:28
Biology3 Lab2

Biology3 Lab2
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  1. atom
    the smallest particle of an element that retains all the properties of that element
  2. element
    a substance that cannot be decomposed into any other subtances by chemical means
  3. 6 major elements that make up 99% of the elements in all living tissue
  4. atomic number
    the characteristic number of protons for each element
  5. capacity for first 4 energy shells:
    • 1st: 2
    • 2nd: 8
    • 3rd: 18
    • 4th: 32
  6. molecule
    a group of chemically combined atoms
  7. diatomic molecule
    a molecule composed of a single element and two atoms
  8. compound
    a molecule of at least two different elements
  9. chemical bond
    a force that holds atoms together
  10. covalent bond
    • a bond formed when one atom shares electron(s) with another atom.
    • generally a very strong bond
  11. ionic bonding
    when one atom donates an electron to another, resulting in oppositely charged ions
  12. ion
    a charged particle
  13. hydrogen bonding
    a weak attraction between molecules or parts of very large molecules
  14. enzyme
    • a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction.
    • reduces the amount of energy required to complete the reaction ==> increases the speed of reaction
  15. identify the components of chemical reactions
    • reactants
    • enzyme
    • products
  16. chemical reaction components of tyrosinase:
    pyrocatechol + oxygen === tyrosinase ==> quinone + water
  17. pH neutral
    a substance that has a pH of exactly 7
  18. acid
    • substances that have a pH of less than 7
    • an acid releases H ions when placed in water
  19. base
    • a substance that has a pH of more than 7
    • bases release hydroxide ions (OH) when placed in water
  20. symbol for a hydroxide ion:
  21. symbol for a hydrogen ion:
  22. if NaOH is a base, how would it dissociate?
    NaOH ==> Na+ + OH-