Chemistry Chapter 2

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Author:
tiffanydawnn
ID:
24030
Filename:
Chemistry Chapter 2
Updated:
2010-06-18 13:14:28
Tags:
chemistry chapter
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Description:
Atoms and Molecules
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  1. element
    • homoatomic molecules
    • cannot be broken down further
  2. compound
    • heteroatomic molecules
    • 2 or more elements form a different substance
  3. chemical formula
    • molecular compound
    • element symbol + subscript for # of atoms
  4. proton
    • subatomic particle
    • + charge
    • mass = 1 amu
    • inside nucleus
  5. neutron
    • subatomic particle
    • no charge
    • mass = 1 amu
    • inside nucleus
  6. electron
    • subatomic particle
    • - charge
    • mass = 1/1836 amu
    • outside nucleus
  7. atomic number (Z)
    number of protons in the nucleus
  8. mass number (A)
    number of protons + neutrons
  9. isotope
    atoms of an element with same number of protons but different number of neutrons
  10. atomic mass unit
    • expresses relative mass of an atom
    • 1 amu = 1/12 mass of carbon-12 atom
  11. atomic weight
    relative mass of an average atom on an element expressed in amu
  12. molecular weight
    • relative mass of a molecule in amu
    • sum of atomic weight of all atoms in a molecule

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