Chemistry Unit 2

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Chemistry Unit 2
2011-10-06 23:38:00

Chem Unit 2
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  1. Chemical Reaction
    How different substances combine with each other to make new ones
  2. Law of Conservation of Mass
    Mass is neither created nor destroyed during ordinary chemistry reaction or physical changes
  3. Law of Definite Properties
    A chemical compund contains the same elements in exactly the same proportions by mass regardless of the sample or source of the compound
  4. Law of Multiple Proportions
    If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the 1st element is always a ratio of small whole numbers
  5. Dalton's atomic theory
    • 1. All matter is made of atoms
    • 2. Atoms of an elemennt are identical in size, mass, and physical properties, but atoms of different elements differ
    • 3. Atoms cannot be subdivided, created, or destroyed
    • 4. Atoms of different elements combine in simple whole numbers ratios to form chemical compounds
    • 5. In chemical reactions, atoms are combinded, seperated, or rearranged
  6. What two parts of Dalton's theory have changed?
    • 2. (Atoms of an element are identical in size, mass, and physical properties, but atoms of different elements differ)- atoms are divisable into even smaller particals
    • 3. (Atoms cannot be subdivided, created, or destroyed)- A given element can have atoms with different masses
  7. Atom
    Smallest partical of an element
  8. Nucleus
    Small region at the center of an atom
  9. Proton
    Positively charged partical
  10. Neutron
  11. Electrons
    Negatice charge surrounding nucleus
  12. Subatomic particles
    Protons, neutrons, ands electrons
  13. Most of the Atom's mass is made of
    protons and neutrons
  14. atomic # =
    # of protons = # of electrons
  15. Isotopes
    Atoms of the same element have different masses (different # of neutrons)
  16. Mass # =
    # of protons = # of neutrons
  17. p+
  18. 0
  19. e-
  20. Z
    atomic number
  21. Relative atomic mass
    based on mass of carbon