Show ALL work, tell me if my answers are right and just show ALL work on the las
ID: 824804 • Letter: S
Question
Show ALL work, tell me if my answers are right and just show ALL work on the last 2 questions.
Determination of Nitrogen Present in Water Samples What are the four (4) processes involved in the Nitrogen Cycle? Fixation, decay, nitrification and deification. What is the most common form of nitrogen and what composition of the air is it? The most common form in nitrogen is a diatomic element in the gas phase composing 78% of the air we breathe. Draw the Lewis dot structure of the most common form of nitrogen. :N = N; Define the term fixation. Fixation is the process of transforming nitrogen gas into a usable form. What are the three (3) inorganic forms of nitrogen? Ammonium (NH4+): nitrite (N02-) and nitrate (No3-) What is spectrophotometry? Spectrophotometry is a method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution. Define the Beer-Lambert Law and its components. What volume of a 3M stock solution is needed to make up a diluted sample of 250mL of a 0.75M solution?Explanation / Answer
1)
4processes are:
Nitrogen Fixation
Nitrification
Denitrification
Decay Processes
2)you are correct
3)you are correct
4)Nitrogen Fixation is the process in which nitrogen gas from the air is continuously made into nitrogen compounds. These compounds (primarily nitrates and ammonium compounds) are made by nitrogen-fixing microorganisms in the soil and by lightning.
5)you are correct
6)
spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelengt.It uses sectrophotometer.
A spectrophotometer is a photometer that can measure the intensity of light as a function of its wavelength. Single beam and double beam are the two major classes of spectrophotometers. Linear range of absorption and spectral bandwidth measurement are the important features of spectrophotometers.
7)The Beer-Lambert law (or Beer's law) is the linear relationship between absorbance and concentration of an absorbing species.
The general Beer-Lambert law is usually written as:
A = a(lambda) * b * c
where A is the measured absorbance, a(lambda) is a wavelength-dependent absorptivity coefficient, b is the path length, and c is the analyte concentration. When working in concentration units of molarity, the Beer-Lambert law is written as:
A = ebselen * b * c
where ebselen is the wavelength-dependent molar absorptivity coefficient with units of M-1 cm-1. Data are frequently reported in percent transmission (I/I0 * 100) or in absorbannce [A = log (I/I0)]. The latter is particularly convenient.
8)
Use dilution formula
M1*V2=M2*V2
3*V1=0.75*250
V1=62.6 ml
ans:62.5 ml should be mixed