Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and...
Homework Answers
ANSWER
Hypothesis
* Increased number of fishes in the body of water result in decrease
in the amount of dissolved oxygen.
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Develop a hypothesis relating to the amount of dissolved oxygen
measured in the water sample and...
Dissolved Oxygen in Aquatic Ecosystems Dissolved oxygen is oxygen trapped in a fluid such as water....
Dissolved Oxygen in Aquatic Ecosystems Dissolved oxygen is oxygen trapped in a fluid such as water. Since many living organisms require oxygen to survive, it is a necessary component of water systems such as streams, lakes, and rivers in order to support aquatic life. The dissolved oxygen is measured in units of ppm (parts per million). Examine the data in the table below, showing the amount of dissolved oxygen present and the number of fish observed in the body of...
Dissolved Oxygen in Water Sample Question 1. Calculate the dissolved oxygen for 300 ml sample of...
Dissolved Oxygen in Water Sample Question 1. Calculate the dissolved oxygen for 300 ml sample of water that was analyzed using Winkler method with azide modification. The sample were titrated against standard 0.025 N of sodium thiosulphate, and the required volume of sodium thiosulphate to reach the colorless endpoint was 13.5ml. Question 2. A student conducted an experiment to measure the biochemical oxygen demand for 400 ml of waste water. She diluted the sample by adding 600 ml of oxygen...
APPLICATION! 1. A nonscientist brings a water sample to your laboratory and asks you to determine...
APPLICATION! 1. A nonscientist brings a water sample to your laboratory and asks you to determine why there was a fish kill in the nearby lake. Having recently finished this experiment, what might you tell that person about the legitimacy of a test for dissolved oxygen? What reasoning would you use to maintain the integrity of your laboratory? 2. Fish kills are often found near the discharge point of water from cooling waters at electrical generating power plants. Explain why...
Biological oxygen demand (BOD) is a water quality parameter that measures the amount of dissolved oxygen...
Biological oxygen demand (BOD) is a water quality parameter that measures the amount of dissolved oxygen used by aerobic microorganisms when breaking down organic matter in water. The first order BOD reaction rate constant for treated wastewater is 0.2 day-1 at 20 °C. What is the first-order rate constant in winter conditions at 2 °C? Assume the activation energy for the reaction is 31.95 kJ/mol. Group of answer choices A. 0 hr-1 B. 0.008 hr-1 C. 0.085 hr-1 D. 0.0035...
10) A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at...
10) A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100 °C with precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 °C and a small amount of precipitate is observed. This solution is
Question 13 Calculate the amount of dissolved oxygen (ppm 02) using the following data: • Sample...
Question 13 Calculate the amount of dissolved oxygen (ppm 02) using the following data: • Sample volume (mL) = 224.893 • Buret Reading, initial (mL) = 3.581 • Buret Reading, final (mL) = 18.25 • Volume of Na2S203 dispensed (mL) = • Average molar concentration of Na2S203 (mol/L) = 0.0219 • Moles of Na2S203 dispensed (mol) = • Moles of 13° reduced by S2032-(mol) = • Moles of O2 (mol) = • Mass of O2 (mg) • Dissolved oxygen, ppm...
in preparing an aqueous molar solution, the amount of water added is not measured and is...
in preparing an aqueous molar solution, the amount of water added is not measured and is not used to calculatw the solution concentration. what is measured carefully and used in calculations is the volume of the mixture if the dissolved solute and water; the volume of the solution. is this true or false??
? ? Mine water flowing at 1.5 m3/s with 2 mg/l dissolved oxygen, joins river water...
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Mine water flowing at 1.5 m3/s with 2 mg/l dissolved oxygen, joins river water flowing at 7 m3ls containing 6 mg/I dissolved oxygen. The dissolved oxygen concentration of the mixture in mg/l is
Dissolved ammonia is a common contaminant in drinking water, streams, and rivers. The dissolved form can...
Dissolved ammonia is a common contaminant in drinking water, streams, and rivers. The dissolved form can cause an unpleasant taste in the water and is toxic to many aquatic life forms. Gaseous ammonia (NH3) has an unpleasant odor that has been described as similar to baby diapers or window cleaner. b. Fish are very sensitive to un-ionized ammonia (NH3) and concentrations as low as I .0 mg/L can be toxic. If you took a sample of water downstream of a...
How would the organisms collected for DNA barcoding from a water source with low dissolved oxygen...
How would the organisms collected for DNA barcoding from a water source with low dissolved oxygen compare to the organisms colleted from a water source with high dissolved oxygen.
10) A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100 °C with precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 °C and a small amount of precipitate is observed. This solution is
Question 13 Calculate the amount of dissolved oxygen (ppm 02) using the following data: • Sample volume (mL) = 224.893 • Buret Reading, initial (mL) = 3.581 • Buret Reading, final (mL) = 18.25 • Volume of Na2S203 dispensed (mL) = • Average molar concentration of Na2S203 (mol/L) = 0.0219 • Moles of Na2S203 dispensed (mol) = • Moles of 13° reduced by S2032-(mol) = • Moles of O2 (mol) = • Mass of O2 (mg) • Dissolved oxygen, ppm...
?
?
Mine water flowing at 1.5 m3/s with 2 mg/l dissolved oxygen, joins river water flowing at 7 m3ls containing 6 mg/I dissolved oxygen. The dissolved oxygen concentration of the mixture in mg/l is
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