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 17:30
What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.
Answers: 1
Chemistry, 22.06.2019 20:30
Which of the following is not true about the atomic model of substances?
Answers: 1
1. What type of electromagnetic wave spans longer than a mountain range?...
History, 29.10.2021 18:00
Mathematics, 29.10.2021 18:00
Social Studies, 29.10.2021 18:00
Social Studies, 29.10.2021 18:00
Mathematics, 29.10.2021 18:00
Health, 29.10.2021 18:00
Chemistry, 29.10.2021 18:00
SAT, 29.10.2021 18:00
Social Studies, 29.10.2021 18:00
Mathematics, 29.10.2021 18:00
Biology, 29.10.2021 18:10
Mathematics, 29.10.2021 18:10
SAT, 29.10.2021 18:10