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The age of any remains from a once-living organism can be determined by radiocarbon dating, a procedure that works by determining the concentration of radioactive 14C in the remains. All living organisms contain an equilibrium concentration of radioactive 14C that gives rise to an average of 15.3 nuclear decay events per minute per gram of carbon. At death, however, no additional 14C is taken in, so the concentration slowly drops as radioactive decay occurs. What is the age of a bone fragment from an archaeological dig if the bone shows an average of 2.3 radioactive events per minute per gram of carbon? Radioactive decay is kinetically a first-order process, and t1/2 for 14C is 5730 years.
Calculate the wavelength of the absorption maximum for a metal complex ion that has a crystal field splitting energy of 279 kJ/mol. The final answer should be in nm.
Several oxidation reductions take place. List three examples of oxidation reduction reactions that are involved. Show what is oxidized what is reduced, and indicate which enzyme (E1, E2, E3) is involved.
How long must a constant current of 50.0 A be passed through an electrolytic cell containing aqueous Cu2+ ions to produce 3.00 moles of copper metal
The acid dissociation for a weak acid Hx at 25c is 1.6x10^-8. Calculate the free energy information for x-(aq) at 25c. The standard free energy of Ax(aq)
At what temperature will a Fahrenheit thermometer reading be the same as a Celsius thermometer reading
lemon juice is a complex aqueous solution that does not freeze in ahome freezer at temperatures as low as -11 degc. at
How large would the lattice energy need to be for the formation of NaCL2 to be exothermic. b. If we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2
the equilibrium constant for a chemical transformation can be predicted from its stoichiometric coefficients whereas the rate law must be determined experimentally.
(a) In the electrolysis of aqueous Na2C2O4, how many liters of CO2(g) (at STP) are generated by a current of 89.9 A for a period of 53.0 min? The unbalanced chemical reaction representing this electrolysis is shown below.
When the reaction was complete, 900 milliliters of carbon dioxide gas were collected at 740 mmHg and 30 degrees C. How many moles of calcium carbonate were consumed in the reaction
Metabolic regulation is achieved via regulating enzyme activity in 3 ways: allosteric regulation, covalent modification, and enzyme synthesis/degradation
At 25 degree celcius ,the second order reaction NOCL(g) - NO (g) + 1/2 CL2 (g) is 50 % complete after 5.82 hours when the initial concentration of Nitrosyl chloride is 4.46 ml/L.what time will it take for the reaction to be 75 % complete.
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