Homework Answers
Ans- Lead contamination poses a serious threat to the safety of drinking water. This colorless, odourless and tasteless metal can go undetected in water. Excessive concentration of lead can place adults at a high risk of cancer, stroke, kidney problems, memory loss and high blood pressure. Lead can cause premature birth, reduced birth weight, seizures, hearing loss, behavioral problems, brain damage, learning disabilities, and a lower IQ level in children. The U.S. Environmental Protection Agency (EPA) states that lead is most serious environmental health hazard for children under the age of 6.
The Centers for Disease Control suggested in the guidance that blood lead concentrations over 5 micrograms per deciliter of blood (µg/dL) may indicate lead poisoning. Various studies have found that blood lead concentrations are positively and significantly related to the amount of lead in drinking water.
The Environmental Protection Agency (EPA) of U.S. set the maximum allowable concentration of lead in public drinking water at 15 µg/L.
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7. In Chicago, they could not see the lead in the drink water, but they could...
What is the molality of lead in tap water if it had a max safe level...
What is the molality of lead in tap water if it had a max safe level of 15 ppb?
Given that any level of lead exposure can have detrimental health effects, especially for children, the...
Given that any level of lead exposure can have detrimental health effects, especially for children, the EPA has not established a reference dose (RED) for lead (i.e. RED=0 mg/(kg*d)). The EPA has established the action level for lead in drinking water at 15 ug/L. Calculate the average daily dose and hazard quotient for a child (body weight = 15 kg) consuming 1 L water per day containing 15 ug/L lead. If either of these values cannot be calculated, explain why...
a) which of the following contaminants can lead to metallic taste in water and discoloration of...
a) which of the following contaminants can lead to metallic
taste in water and discoloration of fixtures has generally very few
health concerns
b) which of the following types of drinking water can lead to
metals leaching from pipes potentially leading to hazardous
drinking water conditions if found in excess in households?
c)
if the household water source has a hundred fold decrease in H+
concentration from 5.5 what is the new pH of the water source
Question 42 Which...
A chi-square test was conducted to see if a person’s drink preferences are independent of their...
A chi-square test was conducted to see if a person’s drink preferences are independent of their age group using data below. Coffee Softdrink Other 21-34 26 95 18 35-55 41 40 20 above 55 24 13 32 4i) What is d.f. to conduct test of independence? 4i) What is the critical value? 4.iii) Given chi-square test statistic is 59.405, you can conclude: (a) A person’s drink preference is independent of their age (b) A person’s drink preference is dependent on...
Too much chloride ion in drinking water can cause the following undesirable effects: salty taste ....
Too much chloride ion in drinking water can cause the following undesirable effects: salty taste . The EPA's Secondary Maximum Contaminant Level for chloride ion in drinking water is 250 mg/L. (1) If 3.24×104liters of water in a storage tank contains 31.2 grams of Cl-, what is the contaminant level in ppm? ______ ppm Assume that the density of the impure water is 1.00 g/mL. (2) Is this level acceptable based on EPA guidelines? _________ acceptable or not acceptable AND...
A woman who competed in a radio station’s contest to see how much water she could...
A woman who competed in a radio station’s contest to see how much water she could drink without going to the bathroom died of water intoxication, the coroner’s office said Saturday. Jennifer Strange, 28, was found dead Friday in her suburban Rancho Cordova home hours after taking part in the “Hold Your Wee for a Wii” contest in which KDND 107.9 promised a Nintendo Wii video game system for the winner. “She said to one of our supervisors that she...
Lead bromide is found in the environment as a thermal decomposition product of tetraethyl lead and...
Lead bromide is found in the environment as a thermal decomposition product of tetraethyl lead and organobromine agents. Tetraethyl lead was added to gasoline to improve octane rating and organobromine compounds were added to convert the lead oxides formed on combustion to volatile lead bromides so the lead oxides would not coat the pistons. Consider the solubility of PbBr_2 that has a solubility product. pK_sp = 5.18. (a) SEE THE BEAKER: A beaker contains pure water and solid PbBr_2= What...
I believe the answer is D but i could see if the answer was B could...
I believe the answer is D but i could see if the answer was B
could you explain which one and why
17. What is the major product of the following reaction? You should assume there is an excess of reagent - adds a Greur 2 tom 1) CH3CH MgBr LG leaves and mane_ 2) H2O hough water, OH OH What is the main....... . . ..
1.) Some animals that live in the desert never drink water. They are able to survive by producing water from the...
1.) Some animals that live in the desert never drink water. They are able to survive by producing water from the foods they eat. How does this work? (Please describe this at the molecular level) 2.) A person eats a meal consisting of 180g of glucose. How many grams of carbon are in this meal? 3.) What happens to the carbon? (How is it eliminated from the body?) 4.) What happens to the hydrogens that are part of the glucose...
What is The pH of the water source ? The following is an equation used to...
What is The pH of the water source ?
The following is an equation used to calculate the pH of a solution: pH = log10 H ion concentration] This calculation doesn't only apply to something you'd do in a chemistry lab. You could use the equation above to calculate the your city's water source to see if it's at a pH of safe level. Let's say, for example, that the H concentration of a city's water source (such as a...
Given that any level of lead exposure can have detrimental health effects, especially for children, the EPA has not established a reference dose (RED) for lead (i.e. RED=0 mg/(kg*d)). The EPA has established the action level for lead in drinking water at 15 ug/L. Calculate the average daily dose and hazard quotient for a child (body weight = 15 kg) consuming 1 L water per day containing 15 ug/L lead. If either of these values cannot be calculated, explain why...
a) which of the following contaminants can lead to metallic
taste in water and discoloration of fixtures has generally very few
health concerns
b) which of the following types of drinking water can lead to
metals leaching from pipes potentially leading to hazardous
drinking water conditions if found in excess in households?
c)
if the household water source has a hundred fold decrease in H+
concentration from 5.5 what is the new pH of the water source
Question 42 Which...
Lead bromide is found in the environment as a thermal decomposition product of tetraethyl lead and organobromine agents. Tetraethyl lead was added to gasoline to improve octane rating and organobromine compounds were added to convert the lead oxides formed on combustion to volatile lead bromides so the lead oxides would not coat the pistons. Consider the solubility of PbBr_2 that has a solubility product. pK_sp = 5.18. (a) SEE THE BEAKER: A beaker contains pure water and solid PbBr_2= What...
I believe the answer is D but i could see if the answer was B
could you explain which one and why
17. What is the major product of the following reaction? You should assume there is an excess of reagent - adds a Greur 2 tom 1) CH3CH MgBr LG leaves and mane_ 2) H2O hough water, OH OH What is the main....... . . ..
1.) Some animals that live in the desert never drink water. They are able to survive by producing water from the foods they eat. How does this work? (Please describe this at the molecular level) 2.) A person eats a meal consisting of 180g of glucose. How many grams of carbon are in this meal? 3.) What happens to the carbon? (How is it eliminated from the body?) 4.) What happens to the hydrogens that are part of the glucose...
What is The pH of the water source ?
The following is an equation used to calculate the pH of a solution: pH = log10 H ion concentration] This calculation doesn't only apply to something you'd do in a chemistry lab. You could use the equation above to calculate the your city's water source to see if it's at a pH of safe level. Let's say, for example, that the H concentration of a city's water source (such as a...
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