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36 Cards in this Set
- Front
- Back
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What is radioactivity
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when an unstable nucleus disintegrates or decays
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What are the collective particles that make up the nucleus called
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nucleons
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What is an isotope
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atoms with a particular number of protons and different numbers of nutrons
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A/Z(X) what is A and Z
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A is the number of protons plus nutrons and Z is the number of nutrons
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What is an alpha particles
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4/2He
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What is a beta particle
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0/-1 B
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What are Gamma rays
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0/0 Y
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does alpha decay loose electrons
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yes
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What is positron decay
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0/1 B
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What is electron capture
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Adding and electron 0/-1 e
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How do you calculate the N/Z ratio
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(A-Z)/Z
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How high does the weight for the band of stability
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83
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What do you do for neutron rich nuclides or have a high N/Z
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beta decay
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Neutron poor nuclides
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Positron decay or electron capture low N/Z
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Heavy nuclides
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weight over 83 alpha decay
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Do nuclides go through a series of reactions
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yes decay series
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What does A equal
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activity
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what is N
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the change in the number of nucli
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What does the decay rate equal
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- delta N/ Delta T
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What is the SI unit for radioactivity
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becquerel 1 desentigration per second (d/s)
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Is the decay rate proportional to N
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yes
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what equation can you make for the decay rate
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A=KN
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How do we determine the half life of a reaction from its rate constant
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ln Ninit/Nfin=Kt
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T(1/2)=ln 2/K what is another version of this reation
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ln Ninit/(1/2)Ninit= Kt(1/2)
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If you have a large K and a small K what is the half life
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short half life
long half life |
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How does much of our prehistoric knowldge come from
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radiosotopic dating
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What order is half life in
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first
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what is the expression for radiocarbon dating
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t=1/kln(Aint/Afin)
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What is the most imp equation for fission and fusion
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delda E= delta MC2
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What is delta m
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change in mass
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What are the units for E
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J/Mol
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wha does J =
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kg
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how is delta m measured
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g/mol
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What is one electron
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0/-1 e
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What is one proton
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1/1 P
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What is one nutron
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1/0 n
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