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A sample of rock is found to have a 235U/207Pb ratio of 1 to 15. From its minerology, we know that it contained no lead at the time when it first crystallized. How old is the rock? (Half life of 235U is 704 million years and 207Pb is the daughter product of 235U decay.)
Write a balanced chemical equation for the neutralization reaction upon which this titration is based, and indicate clearly which atom is being protonated. Then, calculate the equilibrium constant for the neutralization reaction.
Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay of k = 1.6x10-3yr-1. What is the half-life of this isotope in years? Give your answer to 3 significant figures.
provide a specific step by step mechanism ( with curved arrow notation) for the conversion of 4-hydroxybutanal to 4-chloro-1-butanol, and then from 4-chloro-1-butanol to tetrahydrofuran.
Weak base NH3 has Kb = 1.75 * 10^-5. Calculate the concentration of hydronium and pH of 0.252 M NH3 aqueous solution.
separation and purification scheme 50% toluic acid, 40% fluorene, 10% 1,4-dibromobenzene
According to the valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom?
Lipids (fats) are esters of long chain fatty acids and glycerol. Similarly, describe the general structures of proteins and carbohydrates.
calculate the approximate volume of a 0.600 mol sample of gas at 15.0 degrees Celcius and a pressure of 1.10 atm.
which of the following conceps best describes the reason that atoms are larger and electron energies are weaker as you
considering the given equation as al2o3s rarr 4 als 3 o2g . where ?h 3339.6 kjmol determine ?h for the formation of
proportional only to the numbers of hydrogens that give each product when substituted for by chlorine. What would be the relative yield of each product?
When 3.8 L of propane gas is completely combusted to form water vapor and carbon dioxide at 350°C and 0.936 atm, what mass of water vapor results?
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