Homework Answers
COD refers to the chemical oxygen demand whereas BOD refers to the biochemical oxygen demand,
The main difference between COD and BOD is that:
COD is the amount of oxygen required for the chemical oxidation of total organic matter in waste water sample.
Its measurement can take few days
Its permissible limit is 250 to 500 ppm
It is always more than BOD on the other hand,
BOD is the amount of oxygen which is used by bacteria while decomposing organic substance under aerobic conditions.
Its measurement take five days.
Its permissible limit is 30 mg/lit.
It is always less than COD.
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16. Please explain the difference between COD and BODs. Then, calculate COD and BODs of a wastewater containing 135...
(Please answer this question) Calculate COD to BOD5 ration for a wastewater sample contains the following:...
(Please answer this question)
Calculate COD to BOD5 ration for a wastewater sample contains the following: 150 mg/L phenol, 100 mg/L ethylene glycol, 40 mg/L sulfide and 125 mg/L ethylene diamine hydrate that is essentially non- biodegradable. Note: Show the DETAILS OF THE CALCULATIONS and CHEMICAL EQUATIONS. HINT: kis 0.2/day.
23. Calculate the ThOD for wastewater containing 40 mg/l. sucrose C.H0.1. (atomic weights: C: 12 H:1 0:16) a 192 b...
23. Calculate the ThOD for wastewater containing 40 mg/l. sucrose C.H0.1. (atomic weights: C: 12 H:1 0:16) a 192 b 180 40.0 42.7 d e 85.4 other, write you answer- 24. When drinking water is disinfected with chlorine, an undesired byproduct, chloroform (CHCb). may be formed. Suppose a 70-kg person drinks 2 L of water every day for 70 years with a chloroform concentration of 0.04 mg/L (the drinking water standard). Potency factor for chloroform- 6.1 x 10 (mg/kg-day) The...
Please show work. Using reasonable estimates of height differences, calculate the blood pressure difference between each...
Please show work.
Using reasonable estimates of height differences, calculate the blood pressure difference between each of the following and the heart (specifically, pressure at the body part minus pressure at the heart): head, hand, foot. Write the answers in Pa and in mm Hg. Assuming that the pressure at the heart is 120 mm Hg, calculate the pressure at the head, at the hand, and at the foot.
In a few sentences please explain the difference between US health care system and that of...
In a few sentences please explain the difference between US health care system and that of other countries. Please include examples. An example could be comparing the healthcare here in the USA to countries that have universal healthcare. Examples and detailed explanation needed You can even compare cost as one of the examples, but I would appreciate a few different examples along with explanations to them. Thank you
Diagonal Difference HackerRank Pseudocode and C++: Given a square matrix, calculate the absolute difference between the...
Diagonal Difference HackerRank Pseudocode and C++: Given a square matrix, calculate the absolute difference between the sums of its diagonals. Function Description Complete the diagonalDifference function described below to calculate the absolute difference between diagonal sums. diagonalDifference( integer: a_size_rows, integer: a_size_cols, integer array: arr) Parameters: a_size_rows: number of rows in array a_size_cols: number of columns in array a: array of integers to process Returns: integer value that was calculated Constraints -100 < = elements of the matrix < = 100...
Please also explain the difference between delta H and delta U. Thanks! 2. Find the changes...
Please also explain the difference between delta H and delta U.
Thanks!
2. Find the changes in internal energy (AU) and enthalpy (AH) per kmol, for air going from 10 bar, 277 K and 2.28 m3/kmol (molar volume), to 333 K and 1 atm. Use the following: 4 Cp = 29.3 kJ kmol-? K-1 Cy = 21 kJ kmol-? K-1 PV/T = constant Do not use any additional properties of ideal gases. There is no need to prove the gas...
Please show work h) What is the time difference (to the nearest hour) between New York...
Please show work
h) What is the time difference (to the nearest hour) between New
York and Honolulu?
i) In Seattle, how many hours different is our local time zone
(assume PST) from Greenwich Mean Time (GMT)? (Calculate it from the
data table above)
Useful Conversions 1 nautical mile = 1.15 statute miles = 6080 feet = 1853 meters = 1.853 km = l' of latitude l knot = 1.15 mph = 1.853 kph 1 statute mile = 0.87 nautical...
please answer 1-5 and show and explain steps clearly, thank you :) 1. How many milliliters...
please answer 1-5 and show and explain steps clearly, thank you
:)
1. How many milliliters of 13.2 MH.SO, are needed to prepare 600.0 mL of 0.10 M H SOC? (4.5 mL) 2. 1.60 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the resulting solution? (0.210 M) 3. A solution containing 292 g of Mg(NO3)2 per liter has a density of 1.108 g/mL. What is the molality...
help with all please 3. Explain the difference in reactivity between organolithium reagents (eg CH Li)...
help with all please
3. Explain the difference in reactivity between organolithium reagents (eg CH Li) and grignard reagents (e.g CHMOX). In other words, which one is more reactive and why? hos Molecular Weight 181.31 Molecular Weight: 106.55 Density: 1.03 g/mL Molecular Weight: 226.32 4. In the above reaction, assume that you plan to use 0.5 mL of the starting acid chloride with 10 mL of 1.0 M phenylmagnesium bromide. Which would be the limiting reagent? What is the theoretical...
please explain the difference between right and left skewed graphs, how you can tell from this...
please explain the difference
between right and left skewed graphs, how you can tell from this
graph, and additionally how to calculate a percentile range for
part b
A middle-school teacher teaches a class of 36 pupils. She decides to plot a histogram of her students' weight (shown below) 2. 16 14 t 12 10 6 4 2 0.5 35.5 40.5 45.5 50.5 55.5 60.5 65.5 Weights (in kg)> a. (2 points) What is the skew of the weight distribution?...
(Please answer this question)
Calculate COD to BOD5 ration for a wastewater sample contains the following: 150 mg/L phenol, 100 mg/L ethylene glycol, 40 mg/L sulfide and 125 mg/L ethylene diamine hydrate that is essentially non- biodegradable. Note: Show the DETAILS OF THE CALCULATIONS and CHEMICAL EQUATIONS. HINT: kis 0.2/day.
23. Calculate the ThOD for wastewater containing 40 mg/l. sucrose C.H0.1. (atomic weights: C: 12 H:1 0:16) a 192 b 180 40.0 42.7 d e 85.4 other, write you answer- 24. When drinking water is disinfected with chlorine, an undesired byproduct, chloroform (CHCb). may be formed. Suppose a 70-kg person drinks 2 L of water every day for 70 years with a chloroform concentration of 0.04 mg/L (the drinking water standard). Potency factor for chloroform- 6.1 x 10 (mg/kg-day) The...
Please show work.
Using reasonable estimates of height differences, calculate the blood pressure difference between each of the following and the heart (specifically, pressure at the body part minus pressure at the heart): head, hand, foot. Write the answers in Pa and in mm Hg. Assuming that the pressure at the heart is 120 mm Hg, calculate the pressure at the head, at the hand, and at the foot.
Please also explain the difference between delta H and delta U.
Thanks!
2. Find the changes in internal energy (AU) and enthalpy (AH) per kmol, for air going from 10 bar, 277 K and 2.28 m3/kmol (molar volume), to 333 K and 1 atm. Use the following: 4 Cp = 29.3 kJ kmol-? K-1 Cy = 21 kJ kmol-? K-1 PV/T = constant Do not use any additional properties of ideal gases. There is no need to prove the gas...
Please show work
h) What is the time difference (to the nearest hour) between New
York and Honolulu?
i) In Seattle, how many hours different is our local time zone
(assume PST) from Greenwich Mean Time (GMT)? (Calculate it from the
data table above)
Useful Conversions 1 nautical mile = 1.15 statute miles = 6080 feet = 1853 meters = 1.853 km = l' of latitude l knot = 1.15 mph = 1.853 kph 1 statute mile = 0.87 nautical...
please answer 1-5 and show and explain steps clearly, thank you
:)
1. How many milliliters of 13.2 MH.SO, are needed to prepare 600.0 mL of 0.10 M H SOC? (4.5 mL) 2. 1.60 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the resulting solution? (0.210 M) 3. A solution containing 292 g of Mg(NO3)2 per liter has a density of 1.108 g/mL. What is the molality...
help with all please
3. Explain the difference in reactivity between organolithium reagents (eg CH Li) and grignard reagents (e.g CHMOX). In other words, which one is more reactive and why? hos Molecular Weight 181.31 Molecular Weight: 106.55 Density: 1.03 g/mL Molecular Weight: 226.32 4. In the above reaction, assume that you plan to use 0.5 mL of the starting acid chloride with 10 mL of 1.0 M phenylmagnesium bromide. Which would be the limiting reagent? What is the theoretical...
please explain the difference
between right and left skewed graphs, how you can tell from this
graph, and additionally how to calculate a percentile range for
part b
A middle-school teacher teaches a class of 36 pupils. She decides to plot a histogram of her students' weight (shown below) 2. 16 14 t 12 10 6 4 2 0.5 35.5 40.5 45.5 50.5 55.5 60.5 65.5 Weights (in kg)> a. (2 points) What is the skew of the weight distribution?...
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