Chemistry Ch.21

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8thgradeclass
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294735
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Chemistry Ch.21
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2015-02-03 10:46:55
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  1. Original mass is represented by __.
    • No
  2. Remaining mass is represented by __.
    Nr
  3. The number of half lives is represented by __.
    xn
  4. Decayed mass is represented by__.
    Nd
  5. Total times is represented by __.
    Tt
  6. Half life is represented by __.
    T1/2
  7. What is the equation used to find the number of remaining mass?
    NNo 2n
  8. What is the equation to find the number of the original mass?
    No= Nr+Nd
  9. What is the equation to find the number of half-lives?
    n= t/ T1/2
  10. Alpha always has ____.
    +4He
  11. Beta- (electron emission) always has ____.
    01e
  12. Beta+ (positron capture) always has ____.
    01e        or        + 01B
  13. Electron capture always has ___.
    01e +
  14. Gama always has ___.
    y
  15. neutrons always has ____.
    10n
  16. When a nucleus splits it is called ___.
    fission
  17. When a nucleus combines with two or more nuclei to form a different nucleus it is called ___.
    fussion
  18. Name the four types of decay.
    Alpha, Beta- (electron emission), Beta+ (positron capture), and Gamma
  19. The difference between the mass of an atom and the sum of the masses of its protons, neutrons, and electrons.
    mass defect
  20. the energy that holds the protons together in the nucleus of an atom
    nuclear binding energy
  21. What is Einstein's equation for finding energy?
    • e=mc2
    • energy = mass defect x the speed of light2
  22. What ratio provides the most stability for atoms with low atomic numbers? Large atomic numbers?
    • n/p = 1/1
    • n/p = 1.5/1
  23. a reaction that affects the nucleus of an atom.
    nuclear reaction
  24. What happens beyond the atomic number 83?
    the repulsive force of the protons is so great that no stable nuclides exist.
  25. the transformation of atoms of one element into atoms of a different element due to a nuclear reaction.
    transmutation
  26. one way transmutation can occur.
    radioactive decay
  27. the electromagnetic radiation or particles emitted from the nucleus during radioactive decay.
    radioactive radiation
  28. Three principle types of nuclear radiation.
    • Alpha Particle
    • Beta Particle
    • Gamma Ray

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