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What are Polychlorinated biphenyl (PCBs)? What are the manners for potential exposure to PCBs? What are the Health Effects from exposure to PCBs?
The lethal inhalation dose of sarin for a 200lb. person has been determined to be 0.0015mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation dose. Possible answers: 1.4x10-4 mg/kg 0.16x10-4 mg/kg 1.8x10-5 mg/kg 0.00023 mg/kg Which of the above answers is correct?
All ammonium compounds, which contain an ammonium ion (NH4+) and a negative ion, are thermally unstable. A. Discuss two ways that ammonium compounds decompose when they are heated. What chemical reaction is involved in the thermal decomposition of ammonium persulfate? B. What is the most likely reason OSHA requires ammoni
a.You use a properly calibrated explosimeter to measure the flammable hazard inside a tank that contained toluene and may still have some residual product a. inside. Your readings show that the atmosphere inside the tank is twenty percent (20%) of the lower explosive limit (=LEL). Assume uniform mixing within the tank for the sa
You are the chief environmental officer of an industrial operation of your choosing. Describe your operation, its different components or stages, the materials used and the type of wastes generated. What is your waste management plan and approach for protecting the environment and human health?
The greatest threat to U.S. farmlands in the 1930s was arguably the Dust Bowl. What is the greatest current threat(s) to U.S. farmlands, and what are some possible solutions to it(them)?
I need assistance with an environmental class which is concerning energy sources. I am a little confused as to write this paper.
I need your assistance with two assignments. I am having problems with this class and your guidance is appreciated.
A new global sustainable business and industry incubator network is expanding into a Paris suburb. They want to make the newly acquired building and operations more environmentally friendly, has asked your advice on four measures: a. They are considering renovation using some synthetic building materials. They understand that
Air monitoring provides the following contaminant concentrations at the approximate center of a fire scene in which acres of automobile tires are burning: Carbon monoxide @ 1700 ppm; Carbon dioxide @ 7000 ppm; and Sulfur dioxide @ 600 ppm. Ignoring synergistic effects between these gases, which individual concentrations are cons
When relatively small amounts of magnesium burns, the fires are extinguished using commercially available dry powder. Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?
Question 1: Concetrated acedic acid is a Class II combustible liquid. What is the molecular weight of acetic acid that will form 2 moles of CO2 assuming complete combustion? a. 60 b. 75 c. 88 d. 120 Question 2: When sulfuric acid is a component of polluted air, it chemically attacks statues, memorials and monuments
What distillate is labeled by DOT as a Flammable Liquid to containers and Flammable (when warranted) to bulk packaging, freight, and railcar shipments, along with being a preservative for utility poles and cross ties? Answer Carbon black Flowers of sulfur Creosote oil Coal tar pitch Question 10 Which of the follo
Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. A. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3? Show your solution. B. Discuss at least three potentially hazardous features associated with concentrated sulfuri
What is the concentration of parathion in a lake given the log Kow? What is the concentration of parathion in a fish swimming in this lake?
1. Consider a lake containing 39 ppb (parts per billion) of parathion, which has a log Kow = 3.8. a. If a sample of lake water was mixed with octanol, what is the expected concentration of parathion in the octanol? b. Assuming the body weight of a fish is 4% fat, what is the equilibrium concentration of parathion in the f
We have an environmental chemistry class, we are presently discussing coagulants and flocculants. We are asked to write the balanced equation when glucose is reacted with ammonium chloride + epichlorohydrin + isopropyl alcohol. Therefore, I have the equation: C6H12O6 + NH4Cl + CH3ClO 1) Does this equation need a simpl
Choose one of the following atmospheric issues: air pollution, global warming, ozone depletion, and acid deposition.
Complete the following table, then respond to the questions that follow: Issue Sources Health/Environmental Effects Carbon dioxide (CO2) Chlorofluorocarbons (CFCs) Ground-level ozone (O3) Sulfuric acid (H2SO4) Note: Some pollutants may not have direct health effects. Choose one of the fol
I have an environmental chemistry course in which we are currently studying the environmental and health impacts of wood preservatives such as cresol, pentachlorophenol, and chromated copper arsenate. Question 1: For the 3 wood preservatives noted, would acidic vs. alkaline soil or water conditions cause more (or less) lea
Consider the following aqueous route to oxidize SO2: SO2(aq) + H2O2(aq) -> H2SO4(aq) k = 1.1 X 10^3 L/mols a. The partial pressure and Henry's law constants for SO2 and H2O2 are 2.7 ppm (KH = 1.2 mol L-1atm-1) and 4.9 ppb (KH = 1.0E5 mol L-1atm-1), respectively. Calculate the reaction rate of this process. b. Calculate the re
How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 4.0-cm rainfall of pH 2.00 over an area of 100 square kilometers?
Assume that a waste contains 395.0 mg/L of biodegradable CH2O and is processed through a 190000.0 L/day sewage treatment plant which converts 40% of the waste to CO2 and H2O. Calculate the volume(L) of air (at 25 degrees, 1 atm) required for this conversion. Assume that the O2 is transferred to the water with 20% efficiency.
One metric ton (1000 kg) of coal is required to produce 7.3 MW-hr of electrical energy. In 1993, the Thomas Hill power plant (a small, coal-fired plant supplying rural electric cooperatives) produced 5900000.0 MW-hr. If low sulfur (1%) coal were used, and the gaseous effluent were the only means of discharging the sulfur, what v
Question: Calculate the mass percent of methanol, ethanol, and MTBE, that must be present in gasoline to yield a mixture of 1.8% oxygen by weight.
What volume of sulfuric acid (1.84 g/mL) would be produced in that year after the resulting sulfur dioxide reacted with atmospheric oxygen and water vapor (in liters)?
One metric ton (1000 kg) of coal is required to produce 7.3 MW-hr of electrical energy. In 1993, the Thomas Hill power plant (a small, coal-fired plant supplying rural electric cooperatives) produced 7100000.0 MW-hr. If low sulfur (1%) coal were used, and the gaseous effluent were the only means of discharging the sulfur, what v
**Assume that a waste contains 340.0 mg/L of biodegradable CH2O and is processed through a 200000.0 L/day sewage treatment plant which converts 40% of the waste to CO2 and H2O. Calculate the volume of air (at 25 degrees, 1 atm) required for this conversion. Assume that the O2 is transferred to the water with 20% efficiency**
A certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. A leaking metal can containing 10.0 kg of the pesticide was dumped into a stream with a flow of 10.0 Liters per second moving at 0.7 km/hr. The container leaks pesticide at a constant rate of 5.0 mg/sec. For what distance (in km) downs
How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 2.5-cm rainfall of pH 2.00 over an area of 100 square kilometers? This is the second time that this question has been posted. First response received was incorrect. Hints given: Calculate vol rain, mol H+, mass of S, mass of coal.