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- Which 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 nitrogenA 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.doug began preparing laboratory surface disinfectant from chlorine bleach. he put on a chemical resistant apron and gloves and then removed the bleach container from the special chemical cabinet. he carefully placed the container on the laboratory benchtop and began to add the chlorine bleach to distilled water. nearby workers began complaining of burning eyes. doug was reprimanded by the supervisor. Explain why.
- During a routine check of the fluoride content of Gotham City's water supply, the given results were obtained from replicate analyses of a single sample: 0.815 mg/L, 0.789 mg/L, 0.811 mg/L, 0.789 mg/L, and 0.815 mg/L. Determine the mean and 90% confidence interval for the average fluoride concentration in this sample. Report the mean and the confidence interval using the "real rules" for significant figures. mean: 0.804 90% confidence interval: 2.32 x10-4 Incorrect mg/L mg/LA large population of Japanese beetles infests a plot of cropland. In response to the infesta tion, farmers treat the land with organochlorine pesticides. As a result of the treatment, the population of Japanese beetles is eradicated within the cropland, along with the popula- tions of multiple other insect species. Which of the following statements explains the most likely reason for the death of so many insect populations? Organochlorine pesticides are persistent organic pollutants that interfere with the respi- ratory system of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the growth hor- mones of the insect populations. Organochlorine pesticides are persistent organic pollutants and interfere with the re- productive organs of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the transmission of nerve impulses, resulting in spasms, seizures, and death of the insect populations.Different type of methods used in household contaminated wastewater purification
- The first step in water treatment plant is chlorination to kills microorganisms screening to removes large objects such as fish and twigs fluoridation to prevents tooth decay aeration to removes unpleasant odourDetermine the NO2−/NO3- ratio for a neutral surface water that is saturated with oxygen. What is the ratio if the system has a pH of 6? This is a redox problem.250 mL of water sample was collected from a river and sent to a laboratory to determine the concentration of the total suspended solid. In the laboratory, 5 mL of the water sample was transferred to a 100 mL volumetric flask before diluted with distilled water to 100 mL. After that, 50 mL of the diluted water sample was transferred to a funnel containing a glass fiber filter and attached to a glass flask with the sidearm connected to a operating vacuum pump. Transferred diluted water sample was left drained through the glass filter before glass fiber was transferred to an oven to heat at 105 oC under a constant weight of 0.2654 g was obtained. If the initial weight of the glass fiber filter is 0.2431 g. Calculate the amount of the suspended solid in mg unit contained in the 250 mL collected water sample.
- physical chemistry Roughly, what is the error introduced by the solution of some of the CO2 in the water in the bomb? The solubility of CO2 is about 0.0015 g/mL at 25°C and 1 atm CO2 pressure. The heat of solution of CO2 in a dilute aqueous solution is roughly -19.4 kJ/mol. Assume that the final CO2 pressure is 2 atm and that Henry's Law applies.SEE MORE QUESTIONS