4241M1_S11Key - GLY4241/5243 Name 60 points 19 took exam Numbers to the left of the question number in red are the number of incorrect responses

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1 GLY4241/5243 Name 60 points February 10, 2011 19 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 1 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) 1 T 1. The Clarke of concentration can change over time. 1 T 2. It is possible for an element to exhibit different geochemical preferences depending on the chemical conditions it is in. 2 F 3. Heavy elements are much more abundant than the light elements. 1 T 4. Elements of even atomic number are more abundant than elements of odd atomic number on either side, producing a distinct zig-zag (up-down) pattern to the whole curve when abundance is plotted versus atomic number. 3 F 5. Environmental geochemistry is restricted to low-temperature geochemistry including chemical weathering, chemical diagenetic changes, aqueous and most atmospheric chemistry. 1 T 6. Tens of thousands of new chemical compounds are produced and introduced into the environment every year. While a few of these, such as new pharmaceutical products, are extensively tested, most are tested very little or not at all. 8 F 7. Trace elements almost always follow Goldschmidt’s geochemical classification. 4 T 8. The word "stable" should only be applied to systems that are at equilibrium. 9 F 9. Concern about the environment is an issue that has only become well-established since the 1980's. 0 T 10. Environmental geochemists often study problems that may combine natural pollution with anthropogenic pollution. 1 F 11. The most abundant element in the universe is oxygen.
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2 0 F 12. The chemistry of the oceanic crust is identical to the chemistry of the continental crust. 1 F 13. Oxidation or reduction has no effect on an element’s chemical affinity within the earth. (i.e. chalcophile, siderophile, etc.) 2 T 14. High kinetic barriers lead to metastable systems. For example, many high pressure minerals, formed at great depths within the earth, do not immediately revert to the lower pressure polymorphs when they reach the surface 0 T 15. Solubility products are a special type of equilibrium constant. 0 T 16. Exposure to increased levels of UV-B radiation can cause changes to DNA, as well as inducing morphological changes in some species. 0 F 17. It is expected that the ozone hole will disappear by 2015, as a result of CFC and HCFC reduction resulting from the Montreal protocol. 8 T 18. The ozone hole over Antarctica begins with the onset of warmer temperatures in late winter or early spring in the Southern Hemisphere. Remember the peak is around the last week of September 1 T 19. In the lowest level of the earth’s atmosphere, some ozone is produced naturally by lightening. 1
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4241M1_S11Key - GLY4241/5243 Name 60 points 19 took exam Numbers to the left of the question number in red are the number of incorrect responses

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