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An experiment is performed to determine the density of a metal. When a 35.1 g piece of the metal is placed in a graduated cylinder containing 32.8 mL of water, the volume increases to 39.2 mL. What is the density of the metal?
Assuming that an enzyme uses a mechanism similar to that of chymotrypsin, determine which residue of the catalytic triad (Asp, His, Ser) corresponds to pKa of 6.25 and 8.75.
What would be the result of a column chromatographic separation if the column chromatography was to be performed in the following eluents:
what would you expect to see if you performed a benedits and fehlings tests on manosse and galactose?
The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm. The reaction occurs in a 1.48- cm sample cell, and the only colored species in the reaction has an extinction coefficient of..
The density of octane is 0.703 g/mL. What mass (in g) will a 0.996 gallon sample of octane have
Describe Lavoisiers experiment with mercury. How does this experiment show the law of conservation of mass
Draw the structure of phosphatidylethanolamine containing one lauric and one palmitoleic fatty acid. Show the ionic form expected at pH7.
What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 25c and a pressure of 731 torr
Calculate the volume of 0.500M hydrochloric solution that must be added to 20.5g of sodium ethanoate to make 500cm3 a buffer of pH4.50.The pKa value of ethanoate acid is 4.76.
Consider a saturated solution of Zinc arsenate, Zn3(AsO4)2, in which the following reactions can occur: Zn3(AsO4)s (s) --> 3Zn+2 + 2AsO4 -3 Ksp=1.0e-27 AsO4 -3 + H2O ---> HAsO4 -2 + OH- Kb1=3
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?
a sample of an ethanol-water solution has a volume of 54.2 cm3 and a mass of 49.6g. what is the percentage of ethanol in the solution?
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