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The activity of an enzyme is close to zero at pH = 10 and above and high at pH = 6 and below. The activity of this protein probably depends upon the presence of an amino acid with R-group: A. that has a pKR = 8 and must be protonated for activity. B. that has a pKR = 6 and must be unprotonated for activity. C. that has a pKR = 10 and must be protonated for activity. D. that has a pKR = 4 and must be protonated for activity. E. that has a pKR = 8 and must be unprotonated for activity.
Calculate the molar solubility of BaCO3 in a 0.10 M solution of Na2CO3 (aq). Ksp (BaCO3) = 8.1 x 10^-9
The reduction of benzaldehyde by NADD leads to lower Vmax even all the conditions are kept constant. Provide a reason that explains this data
A solution is prepared by mixing 50.0 mL of 0.18 M Pb(NO3)2 with 50.0 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 *10-5.
If 450g of acetone is reacted with 650g of benzaldehyde and it yields 350g of the product what is the percent yield? Show your calculations.
an unknown organic compound is mixed with 0.5190 g of naphthalene crystals to give a mixture having a total mass of
How many milliliters of ammonium sulfate solution having a concentration of 0.411 M are needed to react completely with 61.4 mL of 1.24 M sodium hydroxide solution. The net ionic equation for the reaction is
What is the percentage by mass of CH4 in the mixture. The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
A sample of iron was dissolved iin hydrochloric acid. The liberated hydrogen was collected by displacement of water. The hydrogen occupied 262 mL at 26 c.
calculate the heat change at 100c in each of the following problems. indicate whether heat was absorbed or released.a.
A graduated cylinder contain s 23.0 mL water. what is the new water level after 35.6 g of silver metal is submerged in the water?
The shielding of electrons gives rise to an effective nuclear charge,Zeff , which explains why boron is larger than oxygen. Estimate the approximate Zeff felt by a valence electron of boron and oxygen, respectively
A 3.00-L flask is filled with gaseous ammonia,NH3 . The gas pressure measured at 20.0 deg C is 2.05 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
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