Chemistry, 11.05.2021 20:30, skyvargasov9cad
Fill in the blank with the correct word pair: The heart exchanges blood that is oxygen with blood that is oxygen to keep our cells alive. *
high/low
rich/poor
red/blue
saturated/unsaturated
Answers: 3
Chemistry, 21.06.2019 20:00, angeljohnson2081
Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star
Answers: 1
Chemistry, 22.06.2019 05:30, MansellS5529
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
Fill in the blank with the correct word pair: The heart exchanges blood that is oxygen with blood t...
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