MCAT Chem

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nextMD
ID:
191663
Filename:
MCAT Chem
Updated:
2013-01-08 13:41:40
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MCAT Chem Princeton Chapter
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MCAT Chem
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  1. amu
    1 amu = 1.66 x 10-27
  2. mass number
    protons + neutrons
  3. Ephoton
    • hf = h (c/)
    • planck's constant * frequency
    • frequency = speed of light / wavelength
  4. Planck's constant - h
    6.63 x 10-34 J*s
  5. alpha particle - (He)
    • 2 protons and 2 neutrons emitted
    • Ex: 21084Po --> 20682Pb + 42
    • subtracts 4 from mass number
    • subtracts 2 from atomic number
  6. beta decay - -
    • 1 neutron is converted into a proton and an electron.
    • proton and electron (electron is emitted)
    • Mass number remains the same
    • Ex: 146C --> 147N + 0-1e-
    • Occurs when high neutron to proton ratio
    • adds 1 to atomic number
  7. decay
    • 1 proton is converted into a neutron and a positron
    • neutron and positron (positron is emitted)
    • Mass number remains the same
    • Ex: 189F --> 188O + 0+1e+
    • Occurs when high proton to neutron ratio
    • subtracts 1 from atomic number
  8. Electron capture
    • 1 electron is captured to convert a proton into a neutron
    • Similar to + ejection (positron emission)
    • Mass number to stay the same
    • Ex: 5124Cr + 0-1e- --> 5123V
    • Occurs when high proton to neutron ratio
    • subtracts 1 from atomic number
  9. Gamma Decay
    • Gamma Rays have neither mass nor charge
    • Neither mass number nor atomic number change
    • Ex: 3114Si --decay---> 3115P* -- decay-> 3115P + 
  10. mass defect - m
    • total mass of separate nucleons - mass of nucleus
    • will always be positive
  11. E - Einstein's binding energy equation
    mc= m(in amu) x 931.5MeV
  12. In Binding energy 1 kg = 
    9 x 1016 J
  13. c- speed of light squared
    9 x 1016
  14. Half life - t1/2
    • N = N0e-kt
    • N = N0(1/2)t/t1/2 
    • k = (ln 2)/t1/2

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