MULTIPLE CHOICE (2 points each); 1. What is an example of the definition of Envi

Question

MULTIPLE CHOICE (2 points each); 1. What is an example of the definition of Environmental Engineering as "Protection of human populations from effects of adverse environmental factors" (choose one)? O Oil spill prevention from ships 0 Smog prevention from factories O Recycling aluminum cans O Water treatment of natural bacteria from a river 2. The following plot of concentration versus time is used to determine the reaction rate (k) or-k. What type of reaction best describes this reaction? O Zero-order reaction 0 First-order reaction O Second-order reaction O Half-life reaction 200 Concentration Production 80 100 Time 3. The pH of rain is 5.6. What is the hydrogen ion molarity? 0 0.000045 mg/L 0 0.000072 mg/L 0 2,5 x 106 mol/L 0 4.0 x 10* mol/L 4. Express the concentration 20 x 103 M CO2 in ppm. 0 0.020 ppm 0 0.880 ppm 20 ppm 0 880 ppm

Explanation / Answer

1) Water treatment of natural bacteria from a river

2) Zero-order reaction; The change in concentration of reactant and product with time is represented by a straight line.

3) 2.5x10-6 mol/L

pH = ?log [H+] =5.6

Therefore, [H+] = 10^-5.6 = 2.5x10-6 mol/L

4) 880ppm

CO2 has a molar mass of 44. A solution with 1 M concentration would have 44 g of CO2 per 1 L of solution.

Concentration in ppm= 44000x20x10-3 = 880ppm

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