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Charcoal samples from Stonehenge in England were burned in O2, and the resultant CO2 gas bubbled into a solution of CaOH2 (limewater), resulting in the precipitation of CaCO3. The CaCO3 was removed by filtration and dried. A 792 mg sample of the CaCO3 had a radioactivity of 1.6×10-2 Bq because of carbon-14. By comparison, living organisms undergo 15.3 disintegrations per minute per gram of carbon.
Using the half-life of carbon-14, 5715 yr, calculate the age of the charcoal sample.
Explain why each of other solvents is less desirable than the solvent you have chosen. Acetonitrile, dimethylformamide, hexane, methylene chloride are our solvent choices.
Calculate the molar solubility of: a. Mg(OH)2 in 0.25M NaOH(aq) ksp = 1.8x10-11 b. BaSO4 in 0.010M Na2SO4 Ksp = 1.1x10-10
100 mL of 0.150 M acid HA are mixed with 100 mL of 0.0800 M NaOH. Calculate the titration constant, kt, of the resulting reaction. Ka = 1.0 x 10-5
Determine the equilibrium total pressure in a closed reaction flask if 0.040 mol of NO and 0.020 mol of O2 were placed in the evacuated reaction flask and heated to 100°C, resulting in a 75%-yield of NO2.
Boron nitride, BN, has a graphite-like layered structure in which the layers have eclipsed alignment where the B and N atoms in alternative layers in the direction perpendicular to the layers. Rationalize the difference between this structure and ..
When liquid water at 0°C and 1 atm is converted to ice at 0°C and 1 atm, 6.01 kJ mol-1 of energy is released as heat to the surroundings. Calculate the change of entropy for the water, ΔSwater
calculate p value for each ion Ba 2+, Mn 2+and Cl- in a solution that is 4.62 x 10^-3 M in BaCl2 and 1.78 M in MnCl2
The atmospheric pressure in La Grande (683 atmospheric pressure) is significantly lower than that of Portland
Given the following substances in order of increasing acid strength,HOCl(aq)
What is the % by mass of CaCl2.2H2O in the salt mixture B. how many grams of the excess reactant K2C2O4.H2O reacted in the mixture C. How many grams of the K2C2O4. H2O in the salt mixture remain unreacted
believe that the spectrometer is picking up the amylase enzyme in this mixture but I am second guessing myself. Is that the molecule that is being detected by the spectrometer
Consider the effects of local environment on the acidity of the following amino acid residues within a protein. in each case, state whether the side chain pka of the underlined residue will increase, decrease, or remain the same. then briefly stat..
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