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Question: To isolate caffeine from tea, Dora forgot to evaporate methylene chloride (15 ml) before adding the acetone and petroleum ether to crystallize the final product from material containing traces of chlorophyll. No caffeine crystallized. What should she do now to isolate the caffeine in pure form?
sulfuric acid acts as a catalyst for making esters. Write an equation showing the production of Isoamyl alcohol
imagine that you run a nursing home facility in your area. analyze and comment on the role public policy has in the
which of the following electron configurations represent an excited state?
prove the presence of the cations listed : Sn2+ , cd2+, Cu2+, Bi3+. write four paragraphs about these cations a paragraph each?
Given the following balanced equation, determine the rate of reaction with respect to the [NOCl]. If the rate of Cl2 loss is 4.84 * 10-2 M/s, what is the rate of formation of NOCl
Using standard free energy of formation values given below, calculate the equilibrium constant K_p of the reaction
Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in the text- (a) 2H2(g) + O2 (g)--> 2H2O (l). (b) 2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l).
If 27mL of 6.0 M sulfuric acid was spilled, what is the minimum mass of sodium bicarbonate that must be added to the spill to neutralize the acid?
The equilibrium contant Kc for the reaction HF(aq)+H20(l)-->H30+(aq)+F-(aq) is 3.5x10^-4. What is the equilibrium concentraction of H30+ if the initial concentration of HF is 1.0M
Based on the solubility rules, which one of these compounds should be soluble in water?
A reaction taking place under standard conditions is sponteneous at 1000 K but is nonsponteneous at 300 k. What are the signs of delta Hrxn and delta S rxn
From the restrictions on the three quantum numbers that define an orbital, which set of three quantum numbers listed below is forbidden:
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