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HW 2 - list the oxidation state of each element Since the...

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53:050 Natural Environmental Systems Homework Assignment No. 2 – Spring 2011 Due Friday January 28 at the beginning of class (8:30 am) 1. In class we discussed a piece of environmental legislation that is currently affecting Iowa (and other states). It regards the requirement for maintaining “fishable and swimmable” waters. (a) What does this phrase mean and what is the environmental legislation that initiated the requirement? (b) How are NPDES permits used to help accomplish this “fishable and swimmable” goal? 2. Davis & Masten problem 2-4. 3. Balance the following chemical reactions (they are redox reactions): (a) C 12 H 22 O 11 + O 2 CO 2 + H 2 O (b) Cl 2 + KOH KCl + KClO 3 + H 2 O ( Hint: in this reaction chlorine is both oxidized and reduced!) 4. Davis & Masten problem 2-19, but assume T = 30 o C. 5. Davis & Masten problem 2-21, parts (b) and (d), plus
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Unformatted text preview: list the oxidation state of each element. Since the answers are given, you must show all your work to get complete credit. 6. Davis & Masten problem 2-46. 7. Hydrogen sulfide (H 2 S), commonly known as rotten-egg gas. It is reported that the average person can detect the odor at 1 ppm. Assuming room temperature to be 25 o C, how many milligrams of H 2 S would it take to give a concentration of 1 ppm in a 50 ft by 50 ft by 12 ft room? 8. What is the concentration in ppb of 5.0 g/L of ethylbenzene (MW = 106) in water at 30 o C? Extra Credit problem: 9. A 500-L tank contains 200 mg/L of trichloroethylene (TCE) dissolved in hexane. What is the TCE concentration in ppm? The density of trichloroethylene is 1.464 kg/ L and the density of hexane is 0.6603 kg/L....
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