Chemistry, 21.06.2019 12:40 mariobros3090
Numbers with a end value of 4 or lower are rounded up, while with an end value of 5 or higher are rounded down. true or false?
Answers: 1
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 06:40
Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine
Answers: 1
Chemistry, 22.06.2019 14:30
Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:
Answers: 2
Chemistry, 22.06.2019 16:40
Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg
Answers: 3
Numbers with a end value of 4 or lower are rounded up, while with an end value of 5 or higher are ro...
Chemistry, 25.04.2020 20:09
Mathematics, 25.04.2020 20:09
Biology, 25.04.2020 20:09
English, 25.04.2020 20:09
Mathematics, 25.04.2020 20:09
Geography, 25.04.2020 20:09
Mathematics, 25.04.2020 20:09
Mathematics, 25.04.2020 20:09
Mathematics, 25.04.2020 20:09
History, 25.04.2020 20:10
Mathematics, 25.04.2020 20:10
Mathematics, 25.04.2020 20:10