Water and Ph

Cards (27)

  • Water is an essential substance for plant and animal growth
    True
  • Without water, there would be no life on earth
    True
  • Water is essential to life and is in solvent water that
    the chemical reactions of biological processes
    evolved.
    True
  • Although not an organic biomolecule, water is the
    major component of the cell, making around 70 to
    90% of its weight and inert space filler in living
    organism.
    True
  • Due to its highly reactive and unusual properties
    and its ionization products H+ and OH-, water is an
    important factor in modifying structures of
    biomolecules such as nucleic acids, carbohydrates,
    proteins, lipids, enzymes, and other cell
    components
    True
  • Chemically pure water is colorless, odorless and
    tasteless.
    True
  • Water has a higher boiling point, osmotic pressure and high specific heat.
  • Water has high latent heat of vaporization and high surface tension
  • Water had the capacity to dissipate heat to its
    environment.
  • Water is an excellent solvent for ionic compounds
    because of the attraction between the ionic
    components of the molecules and the water dipoles
    is sufficient to overcome the attraction between the
    ions themselves.
  • Non-ionic polar compounds are also very soluble in
    water.
  • Their polar functional group [OH] readily
    hydrogen bonds with water molecules, dispersing
    the compounds among the water molecules.
  • Other substances dispersed by water are those
    hydrophobic group known as amphipathic
    molecules such as salts and fat acids and are called
    micelles.
  • Micelle formation is important for an
    understanding of organized biological
    system among amphipathic compounds
    such as proteins, phospholipids and
    nucleic acids.
  • Water is an irregular tetrahedron with oxygen at its
    center.
  • Two hydrogen are bonded with oxygen forming
    105o a slightly skewed tetrahedron.
  • Because of this structure electrical charge is not
    distributed uniformly about the water molecule.
  • The oxygen side is partially negative because of the
    relatively rich in electrons and the two hydrogen
    forming a region of local positive charge.
  • The unequal distribution of charges with in a
    molecule is term “dipole” such as in water.
  • Colligative properties such as freezing point and
    boiling point, vapor pressure and aromatic pressure
    are altered by dissolved solutes.
  • Colligative properties depend only in the
    number of solute molecules per unit
    volume of solvent and independent of their
    chemical structure.
  • Dissolved solutes disturbed hydrogen
    bonding in water molecules, thus reducing
    its effect as a solvent.
  • Though water ionizes slightly forming hydrogen ion
    and hydroxyl ion
  • PHYSIOLOGICAL BUFFER SYSTEM - A system that can resist a change in pH upon the addition of either acid or base is called a buffer.
  • Solutions of weak acids and their conjugate bases
    and on weak bases and their conjugate acids
    exhibit buffering.
  • Functional groups such as carboxyl group, amino
    group and phosphate esters are functional groups
    of are weak acids or bases that many biomolecules
    possess.
  • Inorganic ions - Vital to the normal functioning of some enzymes
    and for the maintenance of functional conformation
    of proteins, nucleic acids, and carbohydrates