Chemistry, 08.01.2020 08:31 lilpeepxliltracy
Which term describes the unstable arrangement of the reacting particles as the reaction takes place?
reactants
activation energy
products
energy of reaction
activated complex
Answers: 1
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Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium
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How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer
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What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?
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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
Which term describes the unstable arrangement of the reacting particles as the reaction takes place?...
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