Chem 2: Lec 4

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  1. Law of Conservation of Energy
    - Energy can be neither created nor destroyed
  2. Lightning occurs when electrons:
    move to neutralize charge difference between the storm clouds and earth
  3. Law of Definite Proportions
    A compound always has the same relative amounts of the elements that compose it
  4. Subatomic particles include:
    • 1. Electrons
    • -negatively charged subatomic particles found outside the nucleus
    • 2. Protons
    • -positively charged subatomic particles found in the nucleus
    • 4. Neutrons
    • -uncharged subatomic particles found in the nucleus
  5. Electron's charge and mass

  6. Cathode rays
    Stream of electrons
  7. Cations
    Lose Electron
  8. Anion
    - Gain electron
  9. Atomic Number (Z)
    • -Number of protons in the nucleus of an atom
    • -determines the identity of the atom
  10. Isotopes
    atoms of an element with the same atomic number but different number of neutrons
  11. Mass number (A)
    Total number of protons and neutrons for an element
  12. Isotope notation
  13. Neutron Number
    -the number of neutrons in the nucleus of an element's atoms

    N = A - Z
  14. 1 amu =
    1.6606 x 10^-24g
  15. Average atomic mass
    Sum of the atomic mass of each isotope multiplied by its % abundance
  16. Average atomic mass of Cu

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Chem 2: Lec 4
2015-09-14 03:12:30

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