4241M2_S11Key - GLY4241/5243 Name 60 points 17 took exam...

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1 GLY4241/5243 Name 60 points March 24, 2011 17 took exam - Numbers to the left of the question number in red are the number of incorrect responses. Instructor comments are in blue . Florida Atlantic University ENVIRONMENTAL GEOCHEMISTRY MIDTERM 2 EXAMINATION KEY True-False - Print the letter T or F in the blank to indicate if each of the following statements is true or false. Illegible answers are wrong. (1 point each) 0 T 1. Radon is produced by the decay of 232 Th, 235 U, and 238 U. 1 F 2. The oceans are a major source region for radon. 0 T 3. Uranium is often found in reducing environments, such as organic-rich shales, around buried tree stumps, or in coal. 3 T 4. For each atom of radon that decays, between five and eight atoms of radioactive daughter nuclei are produced. 0 T 5. Radon emissions are higher in the Northern Hemisphere than in the Southern Hemisphere. 5 F 6. Weak acids and bases dissociate completely in water. 7 F 7. The salt of a heavy metal, like FeCl 3 , when dissolved in water will make the solution alkaline. Iron complexes hydroxide ions, leaving an excess of H + 1 T 8. Long-lived isotopes may be concentrated by either natural or anthropogenic causes, resulting in increased concentrations and higher levels of radioactivity. 4 T 9. Radon exposure is estimated to account for between 15,000 - 20,000 deaths per year in the United States from lung cancer, according to conservative, reliable current estimates. 0 T 10. Fly ash from coal-fired power plants often contains radioactive elements, and may be a source of radon 2 F 11. The annual expenditure for the reduction of radon exposure greatly exceeds that for asbestos mitigation.
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