0
What else can I help you with?
What are biochemical oxygen demands?
BOD is the oxygen necessary for living organisms in a sample of water for the degradation of organic compounds.
How do you calculate the concentration of oxygen in sample water?
One common method to measure oxygen concentration in water is to use the Winkler method, where oxygen is chemically fixed and titrated with a reducing agent. Another method is using an oxygen probe (or meter) that measures the dissolved oxygen in water. Both methods provide a numerical value representing the concentration of oxygen in the water sample, usually expressed in milligrams per liter (mg/L) or parts per million (ppm).
In BOD testing what is residual DO?
Residual dissolved oxygen (DO) is the amount of oxygen remaining in a water sample after a specific time period during biochemical oxygen demand (BOD) testing. It is used to calculate the oxygen depleted by organic matter present in the sample, which helps in assessing the water quality and pollution levels.
Why is it necessary to add water to the staphylococcus but not the bacillus?
Staphylococcus bacteria are facultative anaerobes, meaning they can grow with or without oxygen. Adding water to the staphylococcus sample creates a suitable environment for growth by providing hydration and oxygen. Bacillus bacteria are aerobic, so they require oxygen for growth. Therefore, adding water is not necessary as long as there is sufficient oxygen available for the bacillus to grow.
How much of a 100 gram sample would remain unchanged after 2 hours?
To determine how much of a 100 gram sample would remain unchanged after 2 hours, it is necessary to know the specific decay rate or change process of the sample. For example, if the sample undergoes a decay process with a known half-life, you can calculate the remaining amount using the formula for exponential decay. Without this information, it's impossible to provide an exact answer. In general, if no decay occurs, the entire 100 grams would remain unchanged.
What are biochemical oxygen demands?
BOD is the oxygen necessary for living organisms in a sample of water for the degradation of organic compounds.
How do you calculate the concentration of oxygen in sample water?
One common method to measure oxygen concentration in water is to use the Winkler method, where oxygen is chemically fixed and titrated with a reducing agent. Another method is using an oxygen probe (or meter) that measures the dissolved oxygen in water. Both methods provide a numerical value representing the concentration of oxygen in the water sample, usually expressed in milligrams per liter (mg/L) or parts per million (ppm).
What are the advantages and disadvantages of large samples?
A large trial is necessary to provide good sample that is representative of the population
In BOD testing what is residual DO?
Residual dissolved oxygen (DO) is the amount of oxygen remaining in a water sample after a specific time period during biochemical oxygen demand (BOD) testing. It is used to calculate the oxygen depleted by organic matter present in the sample, which helps in assessing the water quality and pollution levels.
What is oxygen bomb calorimeter?
An oxygen bomb calorimeter is a device used to measure the energy content of a sample by combusting it in a controlled environment and measuring the temperature change. The sample is sealed in a high-pressure vessel (the bomb) with oxygen, ignited, and the heat released is used to calculate the calorific value of the sample. This method is commonly used to determine the energy content of fuels and food.
How many metric tons of oxygen are combined in a sample of pitchblende that contains 1.8 tons of uranium?
To determine the amount of oxygen combined in the sample of pitchblende, we use the chemical formula of pitchblende, which is U3O8. The molar ratio of uranium to oxygen in U3O8 is 3:8. Given that there are 1.8 tons of uranium in the sample, we calculate the amount of oxygen by multiplying 1.8 tons of uranium by the ratio of oxygen to uranium (8/3). This yields approximately 4.8 tons of oxygen combined in the sample of pitchblende.
How do you calculate dissolved oxygen in water?
Dissolved oxygen in water can be calculated using the formula: DO (mg/L) (Volume of titrant x Normality of titrant x 8 x 1000) / Volume of sample (mL). This formula involves titrating a water sample with a reagent to determine the amount of dissolved oxygen present.
Is it necessary that sample sizes be equal for a two sample test?
No.
Why you need sampling distribution?
in order to calculate the mean of the sample's mean and also to calculate the standard deviation of the sample's
Why is it necessary to add water to the staphylococcus but not the bacillus?
Staphylococcus bacteria are facultative anaerobes, meaning they can grow with or without oxygen. Adding water to the staphylococcus sample creates a suitable environment for growth by providing hydration and oxygen. Bacillus bacteria are aerobic, so they require oxygen for growth. Therefore, adding water is not necessary as long as there is sufficient oxygen available for the bacillus to grow.
How is a sample oxygen different from a sample of a water?
A sample of oxygen is a pure gas composed of oxygen molecules (O2), while a sample of water is a liquid composed of hydrogen and oxygen atoms (H2O). These substances have different physical properties and chemical compositions, with oxygen being a gas and water being a liquid at room temperature.
How do you calculate atoms nitrogen and oxygen?
To calculate the number of atoms in a sample of nitrogen or oxygen, you first need to know the amount of substance in moles (given in the question or calculated from the sample's mass and the molar mass of the element). Then, you can use Avogadro's number (6.022 x 10^23) to convert moles into the number of atoms. This value represents the number of atoms in one mole of a substance.
