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why does one begin a column elution with non polar solvents and progress to more and more polar solvents?
A current of 3.15 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution.
Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: C7H12Cl2: ? 1.07 (integral = 6203, s); ? 2.28 (integral = 1402, d, J = 6 Hz); ? 5.77 (integral = 700, t, J = 6 Hz). Note: The integrals are given in arbitr..
The lethal inhalation dose of sarin for a 200 pound person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation dose.
the pH of the two equivalence points and the volume
If a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
What is the molality of a solution in which 25 g of sodium chloride is dissolved in 2.0 kg of water
Balance the equations and indicate the type of reaction. CaO +HCl -> CaCl2 + H2O. and also, Fe + O2 -> FeO3.
when 45.0 grams of C2H6 are completely combusted, 60 grams of water are produced. Is the ethane pure?
Compare and contrast the endo vs exo-nuclease excision repair mechanisms of DNA polymerase.
Sodium carbonate was used to precipitate silver from a solution. 6.00 grams of silver carbonate were recovered from 1.500L of solution.
1. What is the ph of a solution that results from adding 250 ml of .50 m naoh to 750 ml of .50 m hf? 2. What is the ph of a buffer composed of .035 m h2po4 and .65 m hpo4?
The conductance of an aqueous solution of trans-[Co(en)2Cl2]Cl changes on standing overnight. Would you expect it to incease or decrease. Why
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