Chemistry Two

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Author:
DesLee26
ID:
170606
Filename:
Chemistry Two
Updated:
2012-09-13 00:24:19
Tags:
Chapter TWo
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Description:
Atoms, Molecules, Ions
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  1. How do we determine average isotopic mass?
    • multiply the mass of the element by its relative abundancy
    • *** if there are multiple isotopes, after multiplying, add them together***
  2. What is the problem with weighing out atoms?
    What is the solution
    • not possible
    • we come up with moles, a collection of individual things put together
  3. What is Avogadro's Number?
    ONe mole of any substance contains 6.022 x 1023 formula units
  4. What is molar mass?
    • the mas in grams of one mole of any element
    • numerically equivalent to its atomic mass
  5. What is a nuclear equation?
    a reaction that changes an atomic nucleus
  6. In a nuclear equation, the:
    __ does not change
    __ changes
    __ determines what element it is
    • mass #
    • # of protons and elections
    • # of protons
  7. Comparisons between Nuclear and Chemical Reactions
    • changes an atom's nucleus, usually producing a different element
    • Involves only a change in the way that different atoms are combined
    • Different isotopes of an element have completely different behavior in nuclear reactions
    • Different isotopes of an element have essentially the same behavior

    The energy change accompanying a nuclear reaction is far greather 
    than that accompanying a chemical reaction

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