bio chpt3.txt

  1. Why is significant about water in liquid form?
    It has 1/20 strength of a covalent bond, allowing it to form, break, and reform.
  2. What are the energy levels of H2O in frozen and liquid form?
    • Frozen = hydrogen bonds are stable
    • liquid = hydrogen bonds are constantly breaking and reforming
  3. What is cohesion?
    structural, allows aid in plants by adhesion, high surface tension
  4. adhesion?
    allows plants to transport water against gravity
  5. Water in hydrogen bonding?
    • heat is absorbed = hydrogen bonds break
    • heat is released = hydrogen bonds form
  6. What is a solution?
    Liquid that is a completely homogeneous mixture of two or more substances (e.g., sugar/salt in H2O)
  7. Solvent
    Dissolving agent (H2O is solvent in aqueous solutions)
  8. Solute?
    Substance dissolved in solvent
  9. Difference between hydrophobic/hydrophilic?
    • Phobic = Water HATING
    • Philic = Water LOVING
  10. Hydrophilic?
    polar + ionic, molecules that contain polar or ionic regions
  11. Hydrophobic
    nonpolar + nonionic, molecules that have nonpolar + nonionic properties
  12. Amphipathic molecules?
    contains BOTH hydrophilic and hydrophobic parts (ex: lipids)
  13. pH?
    0 - 14, 0 = acidic, 14 = basic
  14. Acid?
    substance that increases H+ concentration of a solution
  15. Base?
    substance that reduces H+ concentration of a solution
  16. pH range of biological fluids?
    6 - 8 pH
  17. Weak acids?
    proton donors (ex: acetic acid CH3CO2-)
  18. Weak bases?
    proton acceptors (Ex: ammonia NH3)
  19. Buffers
    substance that minimizes changes in concentrations of H+and OH– in a solution, Contains both a weak acid (HA) and its conjugate base (A-)
Card Set
bio chpt3.txt
Chapter 3 Bio