Chemistry, 14.10.2020 14:01 stephanieanaya7
If the last electron to be added to an atom was the sixth electron in the fourth energy level What element would that be?
Answers: 2
Chemistry, 22.06.2019 01:10
Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen
Answers: 2
Chemistry, 22.06.2019 05:30
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.
Answers: 1
Chemistry, 22.06.2019 08:00
What are the similarities of physical and chemical change ?
Answers: 1
If the last electron to be added to an atom was the sixth electron in the fourth energy level What...
English, 26.07.2019 00:20
Computers and Technology, 26.07.2019 00:20
English, 26.07.2019 00:20
Mathematics, 26.07.2019 00:20
History, 26.07.2019 00:20