Flint, Michigan faces a serious water contamination crisis with high levels of lead (Pb) found in...
Flint, Michigan faces a serious water contamination crisis with high levels of lead (Pb) found in the water. The EPA has a limit of 0.015 mg/L. Express this concentration in units of ppb. Assume the water has a density of 1 g/mL.
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Flint, Michigan faces a serious water contamination crisis with
high levels of lead (Pb) found in...
1. Flint, MI faced a serious water crisis when corrosive water leached lead out of aging...
1. Flint, MI faced a serious water crisis when corrosive water leached lead out of aging pipes, which caused elevated lead levels. A lead concentration of 6.37 x 10' M was measured in a household water supply How many times is this above the legal limit of 15 ppb?
The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water....
The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water. The EPA has set a maximum concentration of TCE in drinking water at 5 ppb. Consuming water on a regular basis that contains higher concentrations can lead to cancer. (a) What is the ppb concentration in a 200.0−L (200.0 kg) sample of water that contains 0.15 mg TCE?
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains...
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0012 % Pb by mass. What volume of the water in milliliters contains 155 mg of Pb? (Assume that the density of the solution is 1.0 g/mL.) Express your answer using two significant figures.
2) The EPA has determined that the maximum safe level of nitrate ion in water is...
2) The EPA has determined that the maximum safe level of nitrate ion in water is 10 ppm. Suppose a sample of tap water was determined to have a nitrate ion concentration of 95 ppb. Assume the density of water is 1.00 g/mL a) What is the concentration of nitrate ion in units of ppm? Is it safe to drink? b) What is the concentration of nitrate ion in units of mg/ml? c) What mass of nitrate ion is in...
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate...
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate the concentration of lead in milligrams per liter. lead concentration: m g/L Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 8.00 g of dextrose in 2.00 x 10 mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). percent mass per volume concentration: %...
7. The behaviour of lead in soil/water systems has been described in terms of Langmuir adsorption....
7. The behaviour of lead in soil/water systems has been described in terms of Langmuir adsorption. From laboratory experiments using 'pure solids, the following values for Langmuir parameters have been estimated For clay b = 3200 L mol- Com = 4x10-4 mol g For organic matter b = 10 000 L mol-' Csm = 4x10-4 mol g -7 (a) Use these values to calculate the concentration (in mg L or ppb) of water-soluble lead in equilibrium with clay containing 5...
i cant seem to get #4/5 7.2 g Pb 7.2 mg Pb 106 g sln L...
i cant seem to get #4/5
7.2 g Pb 7.2 mg Pb 106 g sln L sln oblems 3-6: 3) A solution should be prepared as 3.56 M calcium chloride, CaCl2. Calculate mass (b) of the VOI solute that is needed in order to prepare 3500 mL of the solution. 3.56M CaCl2 mois. -= 12.46mols 3.5L - mol 12.46 molsy 110. agu Imol = 1382.86 11400g (4) A solution is prepared by dissolving 65 g of ethyl alcohol (density=0.78 g/mL)...
Food and beverage containers are commonly made of tin, steel, aluminum, or a combination of metals....
Food and beverage containers are commonly made of tin, steel, aluminum, or a combination of metals. Suppose that a laboratory procedure requires a can be made of aluminum. Which property can be used to determine if a can is likely to be made of aluminum? O color Odensity volume mass What is the density of a pear that occupies 32 cm and has a mass of 42 g O 0.7619 g-cm 0 2.0 g.cm O 1.3125 g-cm O 0.76 g.cm...
explaim the mechanisms amd toxological effects if type 1 diabetes in this article Exposure to arsenic...
explaim the mechanisms amd toxological effects if type 1
diabetes in this article
Exposure to arsenic in drinking water is associated with increased prevalence of diabetes. We previously reported an association of diabetes and urinary concentration of dimethylarsinite (DMAS"), a toxic product of arsenic methylation by arsenic (+ 3 oxidation state) methyltransferase (AS3MT). Here we examine associations between AS3MT polymorphism, arsenic metabolism and diabetes. Fasting blood glucose, oral glucose tolerance and self-reported diagnoses were used to identify diabetic individuals. Inorganic...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
1. Flint, MI faced a serious water crisis when corrosive water leached lead out of aging pipes, which caused elevated lead levels. A lead concentration of 6.37 x 10' M was measured in a household water supply How many times is this above the legal limit of 15 ppb?
2) The EPA has determined that the maximum safe level of nitrate ion in water is 10 ppm. Suppose a sample of tap water was determined to have a nitrate ion concentration of 95 ppb. Assume the density of water is 1.00 g/mL a) What is the concentration of nitrate ion in units of ppm? Is it safe to drink? b) What is the concentration of nitrate ion in units of mg/ml? c) What mass of nitrate ion is in...
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate the concentration of lead in milligrams per liter. lead concentration: m g/L Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 8.00 g of dextrose in 2.00 x 10 mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). percent mass per volume concentration: %...
7. The behaviour of lead in soil/water systems has been described in terms of Langmuir adsorption. From laboratory experiments using 'pure solids, the following values for Langmuir parameters have been estimated For clay b = 3200 L mol- Com = 4x10-4 mol g For organic matter b = 10 000 L mol-' Csm = 4x10-4 mol g -7 (a) Use these values to calculate the concentration (in mg L or ppb) of water-soluble lead in equilibrium with clay containing 5...
i cant seem to get #4/5
7.2 g Pb 7.2 mg Pb 106 g sln L sln oblems 3-6: 3) A solution should be prepared as 3.56 M calcium chloride, CaCl2. Calculate mass (b) of the VOI solute that is needed in order to prepare 3500 mL of the solution. 3.56M CaCl2 mois. -= 12.46mols 3.5L - mol 12.46 molsy 110. agu Imol = 1382.86 11400g (4) A solution is prepared by dissolving 65 g of ethyl alcohol (density=0.78 g/mL)...
Food and beverage containers are commonly made of tin, steel, aluminum, or a combination of metals. Suppose that a laboratory procedure requires a can be made of aluminum. Which property can be used to determine if a can is likely to be made of aluminum? O color Odensity volume mass What is the density of a pear that occupies 32 cm and has a mass of 42 g O 0.7619 g-cm 0 2.0 g.cm O 1.3125 g-cm O 0.76 g.cm...
explaim the mechanisms amd toxological effects if type 1
diabetes in this article
Exposure to arsenic in drinking water is associated with increased prevalence of diabetes. We previously reported an association of diabetes and urinary concentration of dimethylarsinite (DMAS"), a toxic product of arsenic methylation by arsenic (+ 3 oxidation state) methyltransferase (AS3MT). Here we examine associations between AS3MT polymorphism, arsenic metabolism and diabetes. Fasting blood glucose, oral glucose tolerance and self-reported diagnoses were used to identify diabetic individuals. Inorganic...
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