TEST-2A Key

TEST-2A Key - BLUE Introduction to Environmental...

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BLUE Introduction to Environmental Engineering (CE 3501) EXAM 2 4/1/10 Name PART A: SHORT ANSWER, 4 points each 1. What are 3 of the ingredients required to produce ozone? a. Hydrocarbons + SOx + sunlight b. CO 2 + sunlight + NOx c. CO + sunlight + NOx d. Sunlight + SO 2 + NOx e. Reactive Particulates + CO + NOx You have a water that contains the following: 100 mmol/L Ca 2+ 40 mmol/L Mg 2+ 143 mmol/L Na + 49 mmol/L K + 68 mmol/L SO 4 2- 200 mmol/L Cl - 136 mmol/L HCO 3 - 2. What is its alkalinity? a. 272 mmol/L b. 136 mmol/L c. 944 mmol/L d. 336 mmol/L e. 472 mmol/L ?±??±????² = °³? 3 + 2 ³? 3 2 + − ° + Assuming a neutral pH the carbonate, hydroxide and hydrogen concentrations will be negligible. Thus: alkalinity = barcarbonate concentration=136. 3. What is the total hardness of the water? a. 332 mmol/L b. 280 mmol/L c. 208 mmol/L d. 140 mmol/L e. 472 mmol/L ´° = ³? 2+ + µ? 2+ = 100 + 40 = 140

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4. What is the carbonate hardness of water (in very general terms)? a. the smaller of the alkalinity or the total hardness b. the same as the total hardness c. the larger of the alkalinity or the total hardness d. the sum of the multivalent cations e. the sum of the cations You walk into a lab and find an aerated water sample (t=0). The sample is labeled and shows that it was collected exactly 2 days earlier (t=-2). You begin a BOD test on the water sample by diluting 10 mL of the sample (total volume 300 mL, DO i = 9 mg/L (t=0)). Five days later (t=5) the DO is 2 mg/L. 5. What is the BOD
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This note was uploaded on 11/10/2011 for the course CE 3502 taught by Professor Hill during the Spring '08 term at Minnesota.

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TEST-2A Key - BLUE Introduction to Environmental...

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