Bio

Card Set Information

Author:
mmoreno28
ID:
36648
Filename:
Bio
Updated:
2010-09-22 18:20:18
Tags:
Biochemistry
Folders:

Description:
life chemistry
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  1. Atoms
    • •protons: positive charge
    • •# of protons = atomic number
    • •found in nucleus
    • •neutrons: no charge
    • •protons+ neutrons = atomic weight
    • •found in nucleus
    • •electrons: negative charge
    • •circulate in orbitals
    • •determinereactivity
  2. Molecules
    • Two or more atoms bound together
    • Subscripts denote number of atoms
    • –CO2 (carbon dioxide)
    • –H2O (water)
    • –C6H12O6 (sugar)
    • •Bond types: ionic, covalent, hydrogen
  3. Ionic Bonds
    • bonds between ions
    • –charged atoms or molecules
    • •may be positive (+) or negative (-)
    • –extra electrons = negative charge
    • –missing electrons = positive charge
    • •some common ions
    • –Na+, Cl-, K+, HCO3-, PO43-
  4. Covelant Bonds
    • electrons are shared
    • –single bond (2 electrons shared)
    • –double bond (4 electrons shared)
    • –triple bond (6 electrons shared)
    • much stronger than ionic bonds
    • –lots of energy stored in the bonds

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