Estimate nitrate and CO2 removal in a lake, if P removal from euphotic zone is observed to be 6 µg/L during the month of April. What is the rate of algae/ phytoplankton biomass production?
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- 3. A bacteria is able to grow on hexadecane as a substrate: C16H34 + 16.28 O2 + 1.42 NH3 →1.65 C4.4HBO₂N8 + a CO₂ + 13.11 H₂O (a) What is the respiratory quotient (mol/mol)? (b) What is the cell formula for this microorganism? (c) Assuming 100% conversion, calculate the yield of cells from hexadecane (Yx/s) and from oxygen (YX/0₂).Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Concentration iron(III) nitrate 0.00200 0.00200 0.00200 0.00200 0.00200 [Fe(NO3)3] (M) Concentration potassium thiocyanate 0.00200 0.00200 0.00200 0.00200 0.00200 [KSCN] (M) Volume Fe(NO3)3 (mL) 5.00 5.00 5.00 5.00 5.00 Volume KSCN (mL) 5.00 4.00 3.00 2.00 1.00 Volume DI water (mL) 0.00 1.00 2.00 3.00 4.00 Initial concentration [Fe3+] (M) 0.00100 0.00100 0.00100 0.00100 0.00100 Initial concentration [SCN] (M) 0.00100 0.000800 0.000600 0.000400 0.000200 Absorbance 0.269 0.192 0.154 0.104 0.052 Equilibrium [FeSCN2+] (M) 0.000198 0.000141 0.000113 0.0000765 0.000038 Equilibrium constant Kc Average KcWhich parameter is measured by determining the drop in dissolved oxygen in a sealed water or wastewater sample for a fixed number of days? microbial count COD BOD phosphorus nitrogen
- A water quality investigation is conducted in a suburban stream. Investigators determine that there are high amounts of developmental malformations in the bluegill fish population. Which of the following statements suggests the most likely cause of this change in the bluegill population? A. Surface runoff containing nitrates from animal feedlots is entering upstream of the bluegill population. Surface runoff containing phosphates from animal feedlots is entering upstream of the bluegill population. Surface runoff containing pollutants from acid precipitation is entering upstream of the bluegill population. Surface runoff containing endocrine disruptors is entering upstream of the bluegill population.Chemistry A young adult (60 kg body weight) drinks two beers of 12 oz. each, over a period of 10 minutes. Assuming instantaneous dilution of alcohol in the total body water after finishing the beers, (Alcohol content in beer is 6 %; density of alcohol is 0.9 g /mL.; 1 oz. = 30 mL.; 80% proof = 40% v/v alcohol; elimination rate is about 10 mL/hour (zero order) (b) one hour after drinking the beers. Assuming that the plasma level of 100 mg /dL is the index of intoxication, was legally drunk this person?(a) In 20 or less of yourown words define the term “leachate”and describe how it forms. (b) Previous records had shown that to prevent acute toxicity to organisms, the maximum mass of CdSO4 that should be allowed into the landfill was determined to be 0.1 kg. This was calculated using a standard concentration of Cd in mg/L where the volume of the leachate pond was used as 500 000L. (i) Provide the name of the CdSO4 compound. State the oxidation number of Cd in this compound (ii) You need to ensure that the concentration used to determine the mass of Cd allowed in the landfill, meets the current regulatory standard. Assuming that previous calculations determined that all of the CdSO4 would be deposited in the leachate pond, what standard concentration of Cd in mg/L was used to determine the maximum mass of allowable CdSO4?
- A sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm. 1. what is the concentration in the original bottle (ppm)What constitutes a 'reference material', and why does its utilization play a criticalrole in the chemical analysis of food products? Provide examples.A first-stage recovery of magnesium from seawater is precipitationof Mg1OH22 with CaO:Mg2+(aq) + CaO(s) + H2O(l)---->Mg(OH)2(s) + Ca2+(aq) What mass of CaO, in grams, is needed to precipitate 1000lb of Mg(OH)2?
- Regarding sewage quality parameters with regard to physical and chemical characteristics, mark V for True or F for False: ( ) Turbidity is caused by the abundance of suspended solids in the water, the fresher and more concentrated the sewage, the greater its turbidity. ( ) Phenols present in sewage are inorganic compounds derived from domestic effluents, and despite being organic matter, they do not cause any change in water quality. ( ) Sewage, both fresh and old, derived from both domestic and industrial activities, is always gray or black in color. ( ) Household effluents have a BOD of around 300 mg/L, which means that 1 liter of sewage consumes about 300 milligrams of oxygen in 7 days. ( ) Phosphorus is a component that can be present in sewage in both organic and inorganic form. In large quantities, the compound causes the exaggerated growth of algae in the medium, which can cause the death of local aquatic life, this phenomenon is called eutrophication.OH and 0.20M NaCH3COO? !! II 12 2.Mr. Roy, the principal of a reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks’like soup, lassi, milk, etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students. After reading the above passage, answer the following: What are the values (at least two) displayed by Mr. Roy? As a student, how can you spread awareness about this issue? What are tranquilizers? Give an example. Why is the use of aspartame limited to cold foods and drinks?