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A mixture of proteins (pepsinogen, myoglobin, and cytochrome c) is subjected to anion exchange chromatography at pH 5. In what order would the subsequent proteins be eluted from DEAE cellulose anion exchanger by a rising salt gradient: cytochrome c (pI, 10.6), pepsinogen (pI, 1.0) and myoglobin (pI, 6.8)?
The first-order rate constant for the decay of the radioactive isotope carbon-14 is 1.2 x 10-4 year-1. What fraction of the carbon-14 initially in a sample is still present 1500 years later
A ground-state H atom absorbs a photon and makes a transition to the n = 4 energy level. It then emits a photon of energy 4.085 x 10^-19 J. What is the final energy and n value of the atom
Divers experience a problem known as the bends when they come up to the surface too fast. Write an essay linking this phenomenon with solubility.
A piece of Al(s) at 94°C is placed in 65g of H2O at 28°C. The Aluminum cools and after equilibrium the final temperature of Aluminum and water is 38°C. What was the mass of the aluminum?
Calculate the concentration of C6H5NH3+ in this buffer solution Answer:1.9 M b) Calculate the pH after 4.0 g of NaOH(s) is added to 1.0 L of this solution
An unknown compound contains only carbon, hydrogen, and oxygen.Combustion of 5.50 of this compound produced 8.07 of carbon dioxide and 3.30 of water.
a 1.000 g sample of a certain mixture is 75% (by mass) potassium sulfate and 25% of an unknown sulfate with formula MSO4. the unknown is dissolved and precipitated with barium ions. If 1.489g of precipitate is collected, what is the identity of M
Calculate the molality of methanol in a solution prepared by dissolving 75.0 mL methanol, CH3OH (density = 0.791 g/mL), in 150 g ethanol.
iron is biolagically important in the transport of oxygen by red blood cells from the lungs to the various organs of
Formic acid (HCOOH) is secreted by ants. Calculate [H3O+] for a 7.40E-3 M aqueous solution of formic acid (Ka = 1.80E-4).
The specific heat of the mixture is 4.21 J/(g.c), What is the enthalpy change for the neutralization reaction of 2.80 mol of CsOH in KJ?
What mass percent of ethylene glycol in water must be used to reduce the freezing point of the mixture to -5.0degrees c?
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