The tables indicates that nitrogen and oxygen are the main components of the atmosphere by volume together these two gases make up approximately 99 of the dry atmosphere why are these gases important A. They are essential to life on earth
B. they have a great influence on climate
C. they absorb ultraviolet radiation from the sun
D. they increased over time causing global warming

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

What are the similarities of physical and chemical change ?