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The absorptivity often used in rapid determinations of protein concentration is the E^1%, based on aromatic amino acid absorbance at 280nm in a 1 cm pathlength. The E^1% employed for a mixture of proteins is 15. (The E^1% is the absorbance of a 1% (w/v) solution.) A solution of proteins diluted 1 in 30 gives an A280 of 0.25. What is the concentration of protein in the undiluted sample?
Cobalt Chloride in varying concentrations Spectrophotometer set to a Wavelength = 510 nm % Transmission = experiment #1 = 31.62, experiment #2 = 89.13 and experiment #3 = 98.86
1 which of the following is evidence for a chemical reaction?a heating purple iodine crystals produces a purple gas.b
You mix 1.0 mL of 0.50 M of Cu(NO3)2 with 6.0 mL of 0.50 KI, and collect the dry CuI precipitate. How many moles of CuI precipitate are expected from Cu(NO3)2
what is the percent yield of a reaction in which 248 g phosphorus trichloride reacts with excess water to form 126 g
Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP.
choose the situation below that would result in an exothermic hsolution. question options when h soetel h hyd when h
Calculate the work associated with the compression of a gas from 121.0L to 80.0 L at constant pressure of 20.7 atm.
The elimination of carbon dioxide from pyruvate ions by a decarboxylase enzyme was monitored by measuring the partial pressure of the gas as it was formed in a 250 mL flask at 20oC.
Write the balanced neutralization reaction between H2SO4 and KOH in aqueous solution. .150 L of .430 M H2SO4 is mixed with 0.100 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization
How do you calculate the effective nuclear charge for ions Cl- and K+ assuming that the core electrons contribute 1.00 and the valence electrons contribute nothing to the screening process
Calculate the change in the mass of copper at the anode or cathode if the charge calculated above is passed through the cell described. Enter your answer as a positive quantity in mg. Mass change at the electrode = ? mg
What would the volume of air inside a 35.0L tire under 244kPa of pressue occupy of it escaped to standard atmospheric conditions
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