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C__DOCUME~1_MICHAE~1_LOCALS~1_Temp_plugtmp-2_PP2

C__DOCUME~1_MICHAE~1_LOCALS~1_Temp_plugtmp-2_PP2 - Chem003...

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Chem003 – Fall 2006 GWU 1 Practice Problems for Exam 2 1. How many neutrons are there in the potassium-40 isotope? A. 59 B. 40 C. 21 D. 19 2. The isotope 31 15 P is also called 3. The following nuclear reaction is an example of 88 226 Ra 2 4 He + 86 222 Rn 4. An alpha particle is the same as a 5. Thorium-234 undergoes beta decay: 90 234 Th 1 0 e + Q . What element is Q? A. 234 91 Pa B. 234 89 Ac C. 233 90 Th D. 233 91 Th 6. 222 86 Rn decays by emission of an alpha particle. The product of this decay is 7. 214 83 Bi decays by beta emission. The product is 8. The process of beta emission can be envisioned as the 9. The atomic number increases by 1 unit during what type of radioactive decay? A. alpha B. beta C. gamma D. none of these 10. After three half-lives, what fraction of the original radioactive isotope remains in a sample? 11. Nitrogen-13 has a half-life of 10 minutes. How much of a 16 mg sample would remain after 40 minutes? 12. The amount of a radioactive isotope that remains after two half-lives have passed is
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Chem003 – Fall 2006 GWU 2 13. Plants incorporate carbon as long they live. Once a plant dies, it takes how many years for 99.9% of the carbon-14 to decay (half-life of C-14 is 5730 years)? A. 573 yrs B. 2865 yrs C. 5730 yrs D. 57300 yrs 14. Carbon-14 dating of ancient objects is particularly effective because C-14 15. Phosphorus-30 decays by positron emission. The product is 16. Positron emission tomography (PET) is a
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