Ap Environmental Science Question Paper

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AP® ENVIRONMENTAL SCIENCE 2008 SCORING GUIDELINES Question 2 (a) Calculate the volume, in m3, of each of the following: (Two points can be earned in each of parts (a)(i) and (a)(ii): 1 point for a correct setup, and 1 point for the correct answer.) (i) The water infiltrated through the landfill per year 200 mm rain × 10,000 m2 1m = 0.2 m rain 1,000 mm 0.2 m 50% infiltrated water 100% water = 1,000 m3 (ii) The leachate that is treated per year 1,000 m3 × 0.9 (90%) = 900 m3 Note: If the answer to (a)(i) is incorrect, then 0.9 times that answer still earns full credit in (a)(ii). (b) Given that the cadmium concentration in the water draining from the landfill is 2.0 g/m3, calculate the mass, in kg, of cadmium that…show more content…
(Two points can be earned: 1 point for the correct setup, and 1 point for the correct answer.) Note: The student can either begin with the difference between the answers for (a)(i) and (a)(ii) or take 10 percent of the answer from (a)(i). Metric conversions do not necessarily have to be shown. 100 m3 drainage water 1 year 0.2 g Cd 1 m3 1 kg 1,000 g = 0.2 kg Cd/year (c) What is the annual cost of treating the leachate from the drainage system? (Two points can be earned: 1 point for the correct setup, and 1 point for the correct answer.) Note: The student must use the answer from (a)(ii). 900 m3 treatable leachate $10 = $ 9,000 year 1 m3 leachate © 2008 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com. AP® ENVIRONMENTAL SCIENCE 2008 SCORING GUIDELINES Question 2 (continued) (d) Discuss TWO viable methods for reducing the amount of cadmium entering…show more content…
Sample: I-2A Score: 9 Part (a)(i): 2 points were earned—1 for the correct setup and 1 for the correct answer. Part (a)(ii): 2 points were earned—1 for the correct setup and 1 for the correct answer. Part (b): 2 points were earned—1 for the correct setup and 1 for the correct answer. Part (c): 2 points were earned—1 for the correct setup and 1 for the correct answer. Part (d): 1 point was earned for stating that the city “could enforce regulations,” which leads to alternate disposal. Incineration is not a viable method. Part (e): No points were earned. Since incineration is not viable, the shortcoming did not earn a point. Sample: I-2B Score: 5 Part (a)(i): 2 points were earned for the correct setup and the correct answer. Part (a)(ii): 1 point was earned. The student makes computational errors that limit the score. Part (b): No points were earned. The setup is nearly correct, but the computation of 10 m3 of infiltration into the surrounding soil should equal 100 m3. This incorrect volume leads to an incorrect calculation and

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