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Nuclear
Chemistry
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Radioactive
Particles
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Alpha Particles
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Helium Nucleus
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Beta Particles
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High Energy Electrons
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Gamma Rays
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Electromagnetic Waves
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Half-Life
The time it takes for half of the atoms of a substance to decay. |
| 1) The half-life of technetium-99 is 6 hours.
What mass of Tc-99 remains from a 10.0 g sample after 18 hours? |
| 2) A radioactive isotope decays from 8
. 00 g to .25 g in 30 days. What is the isotopes half-life? |
| Answers: |
| 1) 18hrs/6hrs = 3 half-lives
10g/2 = 5g 5g/2 = 2.5g 2.5g/2 = 1.
25g |
| 2) 8g/2 = 4g 4g/2 = 2g
2g/2 = 1g 1g/2 = .5g .5g/2 = .25g
The isotope underwent 5 half-lives. 30
days/5 = 6 The isotopes half-life is 6 days. |
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Nuclear Reactions
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| Solve the nuclear equations: |
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