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A Geiger counter registers a count rate of 6,800 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 1,700 counts per minute. What is the half-life of the radioisotope?
The Km for the reaction of chymotrypsin with N-acetylvaline ethyl ester is 8.8 x 10-2 M, and the Km for the reaction of chymotrypsin with N-acetyltyrosine ethyl ester is 6.6 x 10-4 M.
calculate the change in entropy that occurs when 17.10 g of ice at -13.8degc is placed in 54.05 g of water at 100.0degc
Draw an example of the change in molar volume during a 1st and 2nd order phase transition vs. temperature.
ironiii is polarographically reduced to ironiiat potentials more negative than about 0.4v versus sce and is further
What is the ph of the buffer that results when 12.0 g of NaH2PO4 and 8.00 g of Na2HPO4 are diluted with water to a volume of 0.50 L? ( ka of H2PO4 = 6.2 X10-8, the molar masses of NaH2PO4 and Na2HPO4 are 120.0 g/mol and 142.0 mol respectively)
The minimum amount of energy required to bring about a chemical reaction is called
What would be the balanced chemical equation of Sodium oleate (C18H22NaO2) + sodium chloride
Calculate the molar enthalpy change when mercury is cooled 10 K. The molar heat capacity of mercury is 27.8 J/K*mol
a graduated cylinder contains 110. ml of water. a 10.0 g piece of iron density 7.86 gcm3 and a 18.9 g piece of lead
If the 3d and 4s bands overlap in a metal atom, what is the maximum number of electrons for this composite band
What is the 8 hour TWA concentration in milligrams per cubic meter (mg/m^3)? The final units are in mg/m^3. You have mass in ug. You also have minutes and liters per minute. That should tell you how many liters of air were sampled. Airborne concen..
the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3. How far into the sheet from this high-pressure side will the concentration be 1.8 kg/m3?
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