Biology ch #2.2

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Biology ch #2.2
2010-10-01 00:42:48

ch 2.2 vocab
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  1. Covalent Bond
    two atoms attain stability by sharing electrons
  2. Chemical Bond
    attraction of 2 atoms, linking them together

    -2 types (covalent and ionic)
  3. Compound
    A substance made up of molecules with 2 or more elements
  4. Molecular weight
    every compound has it

    sum of all the atomic weights of all the atoms in a compound
  5. electronegativity
    attractive force that a nucleaus exerts on electrons

    -depends on how many positive charges the nucleus has and the distance between electrons
  6. nonpolar covalent bonds
    the sharing of electrons egually

    atoms must be close in electronegativity
  7. polar covalent bonds
    when electron are drawn to one nucleus more than the other
  8. Polar
    charges of atoms are found at opposite ends of the bond
  9. Ions
    electrically charged particles in an atom in the gain or loss of an electron

    theres cations and anions
  10. Cations
    positive charge

    less electrons than protons
  11. anions
    negatively charged

    more electrons than protons
  12. Ionic Bonds
    bonds formed as a result of electron attraction with opposite charges
  13. Hydrogen Bonds
    bond resulting from the attraction of a negatively charged atom to the positively charged atom

    involves hydrogen
  14. Hydrophilic
    "water loving"

    when polar atoms interact with water by hydrogen bonds
  15. hydrophobic
    "water hating"

    non polar molecules

    nonpolar molecules attract to other nonpolar molecules
  16. van der Waals forces
    interactions between nonpolar substances

    they occur when nonpolar molecules are in close proximity