BCH 361 Exam 1 Ch.3

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BCH 361 Exam 1 Ch.3
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2014-02-16 23:33:33
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  1. Water has an abnormally high boiling point due to intermolecular ___.
    H-bonding
  2. H-bonding is between H and ___.
    O,N,F
  3. 3 types of non-covalent bonding
    • ionic interaction
    • h bonding
    • van der wall forces
  4. ionic interactions sometime result in ___, particularly in the absence of water which normally hydrates ions.
    ionic salt bridges
  5. __ number hydrogen bonding attractions are possible per molecule
    4
  6. Hydrophobic interactions ___.
    The water molecules form a “cage” around the small hydrophobic droplets
  7. Liquid water has a high ___.
    • Heat of vaporization
    • Heat capacity
  8. Ions are hydrated by water molecules. The water molecules orient so the opposite charge end points to the ion to partially neutralize charge. The shell of water molecules is a ____.
    Solvation sphere
  9. Amphipathic molecules contain ___. Ex)
    both polar and non-polar groups. Ionized fatty acids
  10. Micelle?
    charged head facing outward to the water and the nonpolar tail part inside
  11. Sol-Gel Transitions explain
    ex
    • The cytosol contains a high density of polymers and is therefore likely to exist in a gelatinous state, depending on various conditions
    • amoeba to drive movement.
  12. Osmotic Pressure is a ___ process in which solvent molecules pass through a semipermeable membrane from a solution of ___ solute concentration to a solution of ___ solute concentration.
    Spontaneous, lower, higher
  13. another term for shrink due to osmosis
    crenate
  14. another term for burst due to osmosis
    hemolyze
  15. Kw =
    [H3O+][OH-] = 10^-14
  16. Acid is __. and Base is ___.
    proton donor, proton acceptor.
  17. ___ Ka and ___ pKa values indicate stronger acids.
    Larger, smaller
  18. What is a titration?
    It is a process in which carefully measured volumes of a base are added to a solution of an acid in order to determine the acid concentration.
  19. equivalence point :
    • When chemically equal (equivalent) amounts of acid and base are present during a titration
    • only the salt is present in solution
  20. inflection point :
    • equal moles of salt and acid are present in solution
    • Thus pH = pKa
  21. To a buffer solution, if strong acid is added, ___, if strong base is added, ___.
    • it will react with the conjugate base and form more acid. 
    • it will react with the acid to form more conjugate base.
  22. Maximum buffer effect occurs at the ___ for an acid.
    pKa
  23. high concentrations of acid and conjugate base give a high ___
    buffering capcaity
  24. within cells, the primary buffer is the ___ buffer.
    phosphate
  25. the primary blood buffer is the ___ system.
    bicarbonate
  26. zwitterion ?
    • compound with both + and - charges.
    • they are less likely to cause complications with biochemical reactions.
  27. acidosis?
    • pH < 7.35
    • Depression of respiratory rate causes increase in carbon dioxide in blood, leading to lowered pH
  28. Alkalosis
    • pH > 7.45
    • Hyperventilation causes a decrease in carbon dioxide in blood, leading to higher pH

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